JPS632111A - perpendicular magnetic recording head - Google Patents

Abstract

PURPOSE:To obtain a strong vertical magnetizing force by providing anti- magnetic substance in a gap of a vertical magnetic recording head causing a magnetic field from the gap to apply vertical magnetic recording in a magnetic recording medium. CONSTITUTION:In causing an N pole at one tip 2a of a magnetic core 2 having a magnetic gap G and causing an S pole to the other tip 2b at a point of time at recording, the anti-magnetic substance 4 is magnetized in a direction opposite to the magnetic field generated in the magnetic gap G, and N pole is produced at an end opposed to the tip 2a of the magnetic core 2 and an S pole is produced at the end opposed to the tip 2b, resulting that the same poles are produced at each opposed part. The magnetic line of force going from the tip 2a to the tip 2b of the magnetic core 2 does not go straight in the magnetic gap G but is bent toward the magnetic recording medium 5 so as to bypass the anti-magnetic substance 4 by the repulsion of the same poles. Thus, the component of the generated magnetic field perpendicular to the recording face of the magnetic recording medium 5 is increased and a strong vertical magnetizing force is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic recording head that performs so-called perpendicular magnetic recording, in which information is magnetically recorded in a direction perpendicular to the recording surface of a magnetic recording medium.

[Prior Art] Perpendicular magnetic recording has attracted attention in recent years as an ultra-high density recording method. Ring heads and single-pole heads are used as perpendicular magnetic recording heads for perpendicular magnetic recording. The basic structure of the ring head is similar to that of a conventional horizontal (or vertical) AI recording type ring head, and is constructed by winding a coil around a ring-shaped magnetic core having a magnetic gap. In the ring head, the magnetic gap portion of the magnetic core slides relative to the magnetic recording medium, and a recording signal current is applied to the coil to generate a magnetic field corresponding to the recording signal from the magnetic gap, thereby performing perpendicular magnetic recording. There is.

[Problems to be Solved by the Invention] However, the ring head used as a perpendicular magnetic recording head has a problem in that the perpendicular magnetic field generated during recording is weaker than in heads of other types. This is because in a ring head, the width direction of the magnetic gap is parallel to the recording surface of the magnetic recording medium.
This is because the magnetic field is generated across the magnetic gap, so the generated magnetic field inevitably includes a component parallel to the recording surface of the medium.

[Means for Solving the Problems] In order to solve the above-mentioned problems, according to the present invention, a coil is wound around a ring-shaped magnetic core having a magnetic gap, and a magnetic field is generated from the gap. In a perpendicular magnetic recording head that performs perpendicular magnetic recording on a magnetic recording medium, a structure in which a diamagnetic material is disposed within the gap is employed.

[Operation] According to such a structure, the diamagnetic material is magnetized in the direction opposite to the direction of the magnetic field generated in the magnetic gap during recording, and the diamagnetic material is magnetized in the opposite direction to the direction of the magnetic field generated in the magnetic gap, and the diamagnetic material is magnetized in the opposite direction to the direction of the magnetic field generated in the magnetic gap. Each end of the material is excited with the same polarity as the tip of the opposing magnetic core. Due to this repulsion between the same polarities, the lines of magnetic force of the magnetic field generated by the magnetic core are bent in the direction toward the recording surface of the magnetic recording medium, and the component perpendicular to the recording surface of the generated magnetic field increases, resulting in a strong perpendicular magnetizing force.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the accompanying drawings.

The figure is for explaining the structure and operation of the perpendicular magnetic recording head (hereinafter abbreviated as head) of this embodiment.

The head, generally indicated by reference numeral 1, is constructed by winding a coil 3 around a ring-shaped magnetic core 2, and a magnetic gap G is provided between the tips 2a and 2b of the magnetic core 2 to generate a recording magnetic field. is being used.

The difference between this head 1 and the conventional ring head is that a diamagnetic substance 4 is provided inside the magnetic gear G.

The diamagnetic substance 4 is formed by combining various types of ionic compounds having diamagnetic susceptibility, for example.

Note that the reference numeral 5 indicates a magnetic recording medium such as a magnetic disk or a magnetic tape.

With this structure, during recording, the tip surface of the magnetic core 2 is used as a sliding surface to slide on the magnetic recording medium 5 running in the direction of arrow A, and a recording signal current is applied to the coil 3 to generate a magnetic field according to the recording signal. Magnetic recording is performed on the magnetic recording medium 5 by generating it from the magnetic gap G.

In this case, according to Rad in this embodiment, a strong perpendicular magnetization force can be obtained in the following manner.

That is, assume that at a certain point during recording, as shown in the figure, a north pole is excited in one tip 2a of the magnetic core 2 across a magnetic gap G, and a south pole is excited in the other tip 2b. Then, the diamagnetic substance 4 is magnetized in the opposite direction to the direction of the magnetic field generated in the magnetic gap G due to its diamagnetic property, and the end opposite to the tip 2a of the magnetic core 2 has an N pole, and the end opposite to the tip 2b has an N pole. The south pole is excited in one part, and the same polarity is excited in each opposing part.

Due to this repulsion between the same polarities, the lines of magnetic force extending from the tip 2a to the tip 2b of the magnetic core 2 are bent toward the magnetic recording medium 5 so as to bypass the diamagnetic material 4 instead of going straight through the magnetic gear G. .

Therefore, the component of the generated magnetic field perpendicular to the recording surface of the magnetic recording medium 5 increases significantly compared to the case of a conventional ring head, and a strong perpendicular magnetizing force is obtained, making it possible to perform good recording.

Note that the widths of the two gaps between each of the tips 2a and 2b of the magnetic core 2 and the diamagnetic material 4 may be the same;
A difference may be provided, for example, at the rear end portion 2b in the running direction of the magnetic recording medium 5.

The gap width between the diamagnetic substances 4 may be made narrower than the gap width between the front end portion 2a and the diamagnetic substance 4, and short wavelength recording may be performed using the rear gap as the main gap.

Further, the method of winding the coil 3 is not limited to one location at the center of the rear portion of the magnetic core 2 as shown in the figure, but it goes without saying that other winding methods may be used.

[Effects] As is clear from the above description, according to the present invention, a coil is wound around a ring-shaped magnetic core having a magnetic gap, a magnetic field is generated from the gap, and a perpendicular magnetic field is applied to the magnetic recording medium. In the perpendicular magnetic recording head that performs recording, a structure is adopted in which a diamagnetic substance is placed inside the gap, so a strong perpendicular magnetizing force can be obtained during recording with a simple and inexpensive structure, and good recording can be performed. This results in an invasive effect.

[Brief explanation of the drawing]

The figure is an explanatory diagram of the structure and operation of a perpendicular magnetic recording head according to an embodiment of the present invention. 1... Perpendicular magnetic recording head 2... Magnetic core 3... Coil 4... Diamagnetic material 5... Magnetic recording medium G... Magnetic gap

Claims (1)

[Claims] In a perpendicular magnetic recording head that is configured by winding a coil around a ring-shaped magnetic core having a magnetic gap and performs perpendicular magnetic recording on a magnetic recording medium by generating a magnetic field from the gap, a diamagnetic material is contained in the gap. A perpendicular magnetic recording head characterized by: