JPH05225635A - Magnetic field generator for magneto-optical disk and magneto-optical disk device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a magnetic field generator and a recording / reproducing apparatus for a magneto-optical disk, and a magnetic field generator that allows the disk to stably run even at the outer peripheral portion, and a magnetic field modulation using the magnetic field generator. It is an object of the present invention to provide a magneto-optical disk device capable of both an overwrite system and a system requiring a conventional recording / reproducing / erasing process. [Structure] A slider part capable of floating and sliding on a magneto-optical disk by an aerodynamic effect, and a magnetic field generating part for giving a magnetic field to the magneto-optical disk are provided, and a magnetic pole tip surface of this magnetic field generating part does not contact the magneto-optical disk. Thus, the magnetic pole is set back from the slide surface of the slider portion, and the magnetic pole is arranged on the side portion of the slider. [Effect] A stable floating traveling state can be obtained without being affected by the bulge at the end of the disk, and overwrite can be performed by favorable magnetic field modulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field generator capable of both overwriting of a magneto-optical disk of a magnetic field modulation overwrite type and recording / reproducing erasing of a magneto-optical disk requiring a conventional erasing process. The present invention relates to a magneto-optical disk device.

[0002]

2. Description of the Related Art In recent years, magneto-optical disk devices capable of recording information signals with high density have been used. This uses an alloy of a rare earth and a transition metal as a recording medium, and erases
A magneto-optical disk device requiring three processes of recording and reproduction and a magneto-optical disk device capable of overwriting by a magnetic field modulation method have been considered.

The conventional magneto-optical disk device and magnetic field generator described above will be described below with reference to the drawings.

FIG. 7 is a schematic view of a conventional magneto-optical disk device (conventional example 1) which requires three processes of erasing, recording and reproducing. In FIG. 7, reference numeral 1 denotes a conventional magneto-optical disk, in which a magneto-optical recording layer 3 is formed on a substrate 2 by a thin film forming means such as sputtering. Reference numeral 4 is a magnetic field generator composed of a magnet or an electromagnet, 5 is a laser beam, and 6 is an objective lens for focusing the laser beam of 5.

The operation of the conventional magneto-optical disk having the above-mentioned structure and the recording system of the apparatus will be described below.

The direction of magnetization of the magneto-optical recording layer 3 on the substrate 2 is previously aligned in one direction during the erasing process. When a magnetic field is applied to the magneto-optical disk 1 by a magnetic field generator 4 and the magneto-optical recording layer 3 is heated to a temperature near the Curie temperature or higher by the laser beam 5 focused by the objective lens 6,
During cooling, the magnetization of the magneto-optical recording layer 3 changes and is fixed according to the direction of the magnetic field, and the recording process is achieved. In reality, the laser beam 5 is an on / off signal modulated with a recording signal,
The magnetization of the magneto-optical recording layer 3 is reversed only when heated. To erase the recording medium written in this way,
That is, the direction of the magnetization of the magneto-optical recording layer 3 can be aligned in one direction by inverting the magnetic field of the magnetic field generator 4 and irradiating the laser beam 5 of continuous light.
The reproducing process utilizes the fact that the Kerr rotation angle of the reflected light changes according to the direction of magnetization by irradiating continuous laser light whose intensity is a fraction of that at the time of recording.

In the case of the above-described magneto-optical disk device, when rewriting, it is necessary to erase the previously written information in advance and then record it. Therefore, it takes much time to record information. In order to eliminate this drawback, an overwrite technique is currently being actively researched.
One of them is called the magnetic field modulation method.
It is proposed in Japanese Examined Patent Publication No. 60-48806. In this magnetic field modulation method, a magneto-optical disk device for data files has been proposed which can record data at high speed by using a magnetic field generating means (flying magnetic head) capable of floating and sliding on the magneto-optical disk.

Recording in the magneto-optical disk apparatus (conventional example 2) of the magnetic field modulation type overwrite will be described below with reference to FIG.

In FIG. 8, 7 is a magneto-optical disk compatible with a magnetic field modulation overwrite, and a magneto-optical recording layer 3 is formed on a substrate 2 by a thin film forming means such as sputtering.
Further, a special overcoat layer 8 is provided on the magneto-optical disk for magnetic field modulation overwrite using a flying magnetic head. Reference numeral 5 is a laser beam, 6 is an objective lens for focusing the laser beam of 5, 5 is a flying magnetic head of a magnetic field generator, and 10 is a magnetic head current drive circuit.

When the magneto-optical disk is stopped, the flying magnetic head 9 and the magneto-optical disk 7 are in contact with each other, and when the magneto-optical disk is rotated, the flying magnetic head 9 floats above the special overcoat layer 8 by several μm. That is, the contact start stop (CSS) method is used. For recording, the magneto-optical recording layer 3 is heated to near the Curie temperature with a laser beam 5 emitted continuously, and at the same time, a flying magnetic head 9 applies a modulating magnetic field to the vicinity of the heated portion. Magnetization of the heated magneto-optical recording layer 3 is reversed according to the direction of the modulation magnetic field, and the direction of magnetization is fixed when the magneto-optical recording layer 3 is cooled and is recorded as information. In the case of the conventional example 2, even if the information is already written on the recording track, the previous information is erased at the same time as the writing because the magneto-optical recording layer is heated when the rewriting is performed, and the new information is overwritten. Is done.

[0011]

However, in the magneto-optical disk device of the above-mentioned conventional example 2, the flying magnetic head 9 is about several μm above the special overcoat layer 8 when the magneto-optical disk is rotated. , If the surface accuracy of the disk is not good, stable levitating travel cannot be performed. The magneto-optical disk actually used uses a substrate molded of plastic, and since the special overcoat layer 8 is applied by the spin coating method, the outer peripheral edge of the disk is not flat.

FIG. 6 shows the shape of the outer peripheral edge of the disk. A substrate bulge D and a substrate burr E occur on the molded substrate. The size of the substrate bulge D is about 5 to 30 μm, and the substrate burr E is about 5 to 40 μm. It can be reduced to some extent depending on the molding conditions and the molding die, but it is very difficult to reduce these to 5 μm or less. is there.

Further, after applying the special overcoat layer 8, a ridge 50 is generated at the outer peripheral edge of the disk. Raised width G
Is 0.8 to 1.5 mm, and the height of the ridge is 15 to 50 μ
It is about m. This bulge occurs due to the surface tension effect of the overcoat material even if the substrate is perfectly shaped.

When a conventional flying head is used for such a disc, the flying head becomes unstable when the flying head comes to the outer peripheral end of the disc, or there is a problem that the special overcoat film 8 is destroyed by contact. there were.

On the other hand, the magneto-optical disk device of the above-mentioned conventional example 1 requires an erasing process for erasing previous information in advance when recording, and naturally has no overwrite function. At present, the product of the conventional example 1 is being commercialized, and the product of the conventional example 2 which can be overwritten as the next generation is in the development stage. In this case, the problem is
This means that the magneto-optical disk of Conventional Example 1 cannot be used in the next-generation model of Conventional Example 2 because it does not consider applying a special overcoat for CSS. In the case of a data file, it is important that the information written by the model of the previous generation (conventional example 1) can be read and written by the next generation model (conventional example 2), and the magneto-optical disk for the conventional example 1 is also the device of the conventional example 2. It was desired to be usable.

In view of the above problems, the present invention provides a flying head (magnetic field generator) that exhibits good flying characteristics by the magnetic field modulation method shown in Conventional Example 2, and also requires a conventional erasing process. To provide a magnetic field generator and a magneto-optical disk device capable of overwriting by magnetic field modulation for a conventional magneto-optical disk capable of recording / reproducing / erasing.

[0017]

In order to solve the above problems, a magnetic field generator and a magneto-optical disk device according to the present invention include
The magneto-optical disk has a slider part which can be slid and slid by an aerodynamic effect, and a magnetic field generating part for giving a magnetic field to the magneto-optical disk. The magnetic pole tip surface of the magnetic field generating part is set so as not to come into contact with the magneto-optical disk. The magnetic pole is retracted from the slide surface of the slider portion, and the magnetic pole is arranged on the side portion of the slider.

Further, it is composed of a first magnetic field generator and a second magnetic field generator, and the first magnetic field generator can select a contact state or a non-contact state with respect to the second magnetic field generator. The generator is provided with a first coil for generating a magnetic field in the recording signal frequency band, while the second magnetic field generator is provided with a second coil for generating a DC magnetic field, and the first coil is provided. Of the first magnetic field generator has a slider portion capable of floating and sliding on the magneto-optical disk by an aerodynamic effect. Further, the slider has a magnetic pole tip surface of the first magnetic field generator so as not to come into contact with the magneto-optical disk. The part is set back from the slide surface and the magnetic pole is arranged on the side part of the slider.

[0019]

Since the present invention has the above structure, when the optical head accesses a region near the outer peripheral edge, the magnetic field generator connected to the optical head also accesses the outer peripheral edge of the disk. Since the surface is receded from the slider surface, it does not come into contact with the protrusion at the outer peripheral edge of the magneto-optical disk. Since the slider portion of the magnetic field generator is located on the inner circumference side of the disk with respect to the magnetic poles, there is a good planar condition of the disk there, and stable levitating travel is possible.

On the other hand, in the magnetic field generator including the first magnetic field generator and the second magnetic field generator, when the magneto-optical disk is a conventional magneto-optical disk, a DC magnetic field is generated to perform erasing or recording.

That is, the first magnetic field generator and the second magnetic field generator are set in a coupled state, and a current is passed through the second coil to erase or record. In the case of a magneto-optical disk compatible with magnetic field modulation, the first magnetic field generator is set in a separated state, and magnetic field modulation recording is performed by the first coil. That is, in the separated state, the first magnetic field generator having the slider portion and the first coil flies over the magneto-optical disk by the aerodynamic effect. Also in this case, since the magnetic pole tip surface of the first magnetic field generator is set back from the slider surface, it does not come into contact with the protrusion at the outer peripheral edge of the magneto-optical disk.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic field generator according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a magnetic field generator according to the first embodiment of the present invention, and FIG. 2 is a side view of the magnetic field generator according to the first embodiment of the present invention and a part thereof. FIG. In FIGS. 1 and 2, 7 is a magneto-optical disk compatible with magnetic field modulation overwrite, 11 is a magnetic field generator of this embodiment, 12 is a load beam, 13 is a slider, and 14 is a magnetic field in the recording signal frequency band. Magnetic field generator, 15
Is a coil, 16 is a gimbal that connects the suspension and the slider, 18 is a magnetic pole of the magnetic field generating portion, and 19 is a magnetic pole 1.
The magnetic field from 8, the optical head 20 and the light spot 21.

The magnetic field generator 11 of this embodiment is a magnetic field generator 1
The magnetic pole tip surface of the magnetic pole 18 of 4 is retracted from the slide surface of the slider portion so as not to come into contact with the magneto-optical disc, and the magnetic pole is arranged on the side portion of the slider (the outer peripheral side portion of the disc). There is. Since the outer peripheral edge of the magneto-optical disk is raised (see FIG. 6) 50, when the magnetic field generator moves near the outer circumference of the magneto-optical disk when the slider surface and the magnetic pole tip surface are in the same plane. Levitating becomes unstable.

However, in the present embodiment, since the magnetic pole tip surface is retracted from the slider surface by the distance h, running instability does not occur. That is, even when the magnetic field generator accesses the outermost circumference of the disk, the slider portion 13 travels in a portion having no ridge. The distance h is designed in consideration of the protrusion amount (15 to 50 μm) of the magneto-optical disk to be used, and generally about 50 to 100 μm is suitable. If the distance h is made too large, it is necessary to increase the magnetomotive force of the magnetic field generator 14, and the above range is preferable.

When a current is applied to the coil 15, a magnetic field of 19 is generated. Since the coil 15 is driven at a frequency in the recording signal frequency band, a coil having about 10 turns is used in consideration of impedance. The component of the magnetic field 19 perpendicular to the disk is an effective component during overwriting, and the effective range is about 50 μm from the slider surface. Although the flying height depends on the design of the slider in the flying and flying state, it is generally run over the disk by 2 to 10 μm.

Since the thickness of the special overcoat 8 of the magneto-optical disk 7 corresponding to the magnetic field modulation overwrite is at most about 20 μm, a sufficient magnetic field can be applied to the magneto-optical recording layer 3. At the position of the light spot 21 of the optical head 20, the magnetic field 19
The magnetic field generator is aligned so that the vertical component with respect to the disc is maximized.

Regarding the configuration when the magnetic field generator configured as described above is used in an actual magneto-optical disk device,
This will be described with reference to the plan view of FIG. 3A and the side view of FIG. In FIGS. 3A and 3B, 5 is a laser beam, 7 is a magneto-optical disk for magnetic field modulation overwrite, and 2 is
Reference numeral 2 is a spindle motor, 21 is a light spot of a laser beam, 12 is a load beam, and 11 is a magnetic field generator having the above configuration. Reference numeral 23 is a load beam supporting arm joined to the load beam 12, and the optical head 2 is moved by the movement of the magnetic field generator raising / lowering plate 25 which rotates in the direction indicated by the arrow 24.
The load beam 12, which is connected via the zero point, the connecting member 26, and the leaf spring 27, is moved up and down. Therefore, the magnetic field generator 11 is replaced with the magneto-optical disk 7 compatible with the magnetic field modulation overwrite.
Can be brought into contact with or released from.

The operation of the magneto-optical disk device configured as described above will be described below. When the magneto-optical disk 7 compatible with the magnetic field modulation overwrite is mounted, the magnetic field generator raising / lowering plate 25 rotates. Accordingly, the lifted state of the load beam support arm 23 is released,
The magnetic field generator 11 abuts on the special overcoat 8 of the magneto-optical disk 7 corresponding to the magnetic field modulation overwrite. Next, the magneto-optical disk 7 starts to rotate, and the slider 13 starts to slide on the magneto-optical disk 7. When the rotation speed of the magneto-optical disk exceeds a certain value, the levitation gliding state due to the aerodynamic effect is entered, and when the magneto-optical disk enters the steady rotation state,
It will be in a stable levitating condition. The controller built in the magneto-optical disk device performs a series of initial operations, and is ready to perform reproduction and overwrite. In the case of overwrite, the laser beam 5 is continuous light or pulsed light associated with the magnetic field 19 of the magnetic field generator 11.

As described above, in the magnetic field generator of this embodiment or the magneto-optical disk device, the magnetic field generator of the magnetic field generator is arranged on the outer peripheral side of the disk, so that the magnetic field generator is located on the outermost peripheral side of the disk. Even when the slider is accessed, the slider portion 13 travels in a portion having no protrusion. Therefore, a stable floating traveling state is obtained without being affected by the bulge at the end of the disk, and overwriting by favorable magnetic field modulation becomes possible.

FIGS. 4A and 4B are perspective views showing the structure of the magnetic field generator in the second embodiment of the present invention, and the magnetic field generation when a magneto-optical disk compatible with the magnetic field modulation overwrite is mounted. 6 is a side view showing the state of the container, FIG.
(A), (b) is a side view which shows the structure of the magneto-optical disc apparatus in the 2nd Example of this invention.

The configuration will be described below with reference to these figures. Reference numeral 30 denotes a first magnetic field generator having the same configuration as that of the first embodiment. The names of the respective parts are the same as in the first embodiment. However, here, the eleven magnetic field generators are referred to as the first magnetic field generator 30, the magnetic field generation unit 14 is referred to as the first magnetic field generation unit, the coil 15 is referred to as the first coil, and the magnetic pole 18 is referred to as the first magnetic pole.

Reference numeral 31 is for generating a DC magnetic field by the second magnetic field generator. In this embodiment, the first magnetic field generator and the second magnetic field generator are divided or can contact each other. That is, the magnetic circuit can be separated or contacted.

One of the magnetic circuits, that is, the second magnetic field generator 31, comprises a second magnetic core 32, a second coil 33 wound around the second magnetic core 32, and a second magnetic pole 34, and the second magnetic field generator is rigid. It is fixed to an arm 35 having an optical path and is connected to the optical head 20 via a connecting member 26. Therefore, the second magnetic field generator maintains a constant distance from the optical head. In the case of FIGS. 5A and 5B, the first magnetic field generator having the slider portion is the load beam 12 and the spring member 2.
It is connected to the above-mentioned arm 35 via 7. When a current is passed through the second coil, a magnetic field of 42 is generated, and when a current is passed through the first coil, a magnetic field of 19 is generated.

The operation of the magnetic field generator and the magneto-optical disk device configured as described above will be described below. First, it is determined whether the mounted disc is a conventional type disc that requires three processes of erasing, recording, and reproducing or a disc compatible with magnetic field modulation.

Next, in the case of a disc compatible with magnetic field modulation, the magnetic field generator raising and lowering plate 25 rotates as shown in FIG.
The support of the load beam support arm 23 is released. First
The magnetic field generation part of the device descends on the disk and floats on the disk to enter a gliding state. Magnetic field modulation overwrite can be performed by passing a modulation signal current through the first coil. This overwrite is the same as in the second conventional example and the first example. In the case of a conventional type disc, the magnetic field generator raising / lowering plate 25
Does not rotate, so that in each state of recording / reproducing / erasing, the first magnetic field generator is in contact with the second magnetic field generator. In this state, the first magnetic field generator keeps a distance of about 1 mm from the magneto-optical disk. When recording and erasing, a DC current is passed through the second coil 33 to perform recording and erasing.

FIG. 5B shows that the attraction force of the second magnetic field generating portion is used for raising and lowering the first magnetic field generating portion, and the attraction force generated when a current is applied to the second coil 33 is used. First
Move the magnetic field generator of. In the case of a magnetic field modulation compatible disc, no current is passed through the second coil 33. Therefore, since the attractive force does not work, the first magnetic field generator descends onto the disk. On the other hand, in the case of the conventional magneto-optical disk, a current is passed through the second coil 33 to pull up the first magnetic field generator to bring the first magnetic field generator and the second magnetic field generator into a coupled state. In addition to putting both magnetic field generators in a coupled state by the current flowing through the second coil 33, a magnetic field 42 necessary for recording and erasing is generated.
Is obtained. Of course, it is necessary to switch the current polarity between recording and erasing, but this can be instantaneously switched to switch both magnetic field generators in the coupled state. That is, there is no possibility that the first magnetic field generator contacts the conventional type disk. It is necessary to allow a current to flow through the second coil 33 in order to maintain the coupled state even at the time of reproduction, but there is no problem in the case of a magneto-optical disk because it has a sufficiently large coercive force.

As described above, according to the present embodiment, both the overwrite of the magneto-optical disk of the magnetic field modulation overwrite system and the recording / reproduction / erasure of the magneto-optical disk requiring the conventional erasing process can be performed. Further, as in the first embodiment, since the first magnetic field generator is arranged on the outer peripheral side of the disk, even when the magnetic field generator accesses the outermost periphery of the disk, the slider section 13 runs in a portion having no protrusion. ..
Therefore, a stable floating traveling state is obtained without being affected by the bulge at the end of the disk, and overwriting by favorable magnetic field modulation becomes possible.

[0039]

As described above, the magnetic field generator and the magneto-optical disk device of the present invention include a slider portion which can be slid over the magneto-optical disk by an aerodynamic effect, and a magnetic field generator for applying a magnetic field to the magneto-optical disk. The magnetic pole tip surface of this magnetic field generator recedes from the sliding surface of the slider section so that it does not come into contact with the magneto-optical disk, and the magnetic pole is arranged on the side of the slider. Even if the container accesses the outermost circumference of the disc, the slider portion travels in a portion without ridges. Therefore, a stable floating traveling state is obtained without being affected by the bulge at the end of the disk, and overwriting by favorable magnetic field modulation becomes possible.

Further, the magnetic field generator and the magneto-optical disk device of the present invention comprise a first magnetic field generator and a second magnetic field generator, and the first magnetic field generator contacts or does not contact the second magnetic field generator. The contact state can be selected, and the first magnetic field generator has a first coil for generating a magnetic field in the recording signal frequency band, while the second magnetic field generator has a second coil for generating a DC magnetic field. And a first magnetic field generator having the first coil has a slider portion capable of flying and sliding on the magneto-optical disk by an aerodynamic effect, and a magnetic pole of the first magnetic field generator. The tip surface is set back from the sliding surface of the slider so that it does not come into contact with the magneto-optical disk, and the magnetic poles are arranged on the sides of the slider. Conventional recording / playback erase Possible, can provide an optical disk device capable of overwrite by the magnetic field modulation in the magnetic field modulation overwrite corresponding magneto-optical disk, or even when the magnetic field generator accesses the outermost periphery of the disk,
The slider portion 13 runs on a portion having no ridge. Therefore, a stable floating traveling state is obtained without being affected by the bulge at the end of the disk, and overwriting by favorable magnetic field modulation becomes possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic field generator according to a first embodiment of the present invention.

FIG. 2 is a side view of the magnetic field generator according to the first embodiment of the present invention and a partially enlarged view thereof.

3A is a plan view of a magneto-optical disk device using the magnetic field generator of the present invention, and FIG. 3B is a side view of a magneto-optical disk device using the magnetic field generator of the present invention.

FIG. 4A is a perspective view showing a configuration of a magnetic field generator according to a second embodiment of the present invention, and FIG. 4B is a state of the magnetic field generator when a magneto-optical disk compatible with magnetic field modulation overwrite is mounted. A side view of the second embodiment of the magneto-optical disk device of the present invention.

5A is a side view showing a configuration of a magneto-optical disk device according to a second embodiment. FIG. 5B is a side view showing a configuration of a magneto-optical disk device according to the second embodiment.

FIG. 6 is a cross-sectional view showing an example of the shape of the outer peripheral edge of the disc.

FIG. 7 is a schematic diagram of a conventional magneto-optical disk device.

FIG. 8 is a schematic diagram of a conventional magnetic field modulation type overwrite magneto-optical disk device.

[Explanation of symbols]

 1 Conventional type magneto-optical disk 2 Substrate 3 Magneto-optical recording layer 4 Magnetic field generator 5 Laser beam 6 Objective lens 7 Magneto-optical disk compatible with magnetic field modulation overwrite 8 Special overcoat layer 9 Flying magnetic head 10 Magnetic head current drive circuit 11 Magnetic field generation Device 12 Load beam 13 Slider 14 Magnetic field generator 15 Coil 16 Gimbal 18 Magnetic pole 19 Magnetic field 20 Optical head 21 Optical spot 22 Spindle motor 23 Load beam support arm 24 Arrow 25 Magnetic field generator raising and lowering plate 26 Connecting member 27 Leaf spring 30 First Magnetic field generator 31 Second magnetic field generator 32 Second magnetic core 33 Second coil 34 Second magnetic pole 35 Arm 42 Magnetic field 50 Ridge on outer peripheral edge of disk

Claims (4)

[Claims] 1. A slider portion capable of floating and sliding on a magneto-optical disk by an aerodynamic effect, and a magnetic field generating portion for flying together with the slider portion to apply a magnetic field to the magneto-optical disk, and a magnetic pole tip of the magnetic field generating portion. A magnetic field generator for a magneto-optical disk, wherein the surface is set back from the sliding surface of the slider portion so as not to come into contact with the magneto-optical disk, and the magnetic pole is arranged on a side portion of the slider. 2. A slider portion capable of flying and sliding on the magneto-optical disk by an aerodynamic effect, and a magnetic field generating portion for flying with the slider portion to give a magnetic field to the magneto-optical disk, and a magnetic pole tip of the magnetic field generating portion. The surface has a magnetic field generator for a magneto-optical disk which is recessed from the sliding surface of the slider so as not to contact the magneto-optical disk, and the magnetic pole is arranged on the side of the slider. Magnetic disk device. 3. A first magnetic field generator including a first coil for generating a magnetic field in a recording signal frequency band, and a second magnetic field generator including a second coil for generating a DC magnetic field. And a slider part that levitates and slides on the magneto-optical disk by the aerodynamic effect together with the first magnetic field generator, and the first magnetic field generator can select a contact state or a non-contact state with the second magnetic field generator. The magnetic pole tip surface of the first magnetic field generator is set back from the sliding surface of the slider portion so as not to contact the magneto-optical disk, and the magnetic pole is arranged on the side portion of the slider. Magnetic field generator for magneto-optical disk. 4. A first magnetic field generator including a first coil for generating a magnetic field in a recording signal frequency band, and a second magnetic field generator including a second coil for generating a DC magnetic field. And a slider part that levitates and slides on the magneto-optical disk by the aerodynamic effect together with the first magnetic field generator, and the first magnetic field generator can select a contact state or a non-contact state with the second magnetic field generator. And the magnetic pole tip surface of the first magnetic field generator is set back from the sliding surface of the slider portion so as not to come into contact with the magneto-optical disk, and the magnetic pole is arranged on the side portion of the slider. A magneto-optical disk device having a generator.