JPH03296902A - magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain high-density recording without decreasing the distance between the recording or reading part of a recording/reading head and a recording layer by driving the system in a manner that the recording/reading head is brought into contact with the surface of the magnetic recording medium through a magnetic fluid. CONSTITUTION:The magnetic recording layer 2 is formed on a disk substrate 1 for magnetic recording by sputtering, etc., on which a protective film 3 such as SiO2 is formed to constitute the magnetic recording medium 6. A magnetic fluid 4 comprising fluorinated oil as the base and magnetic fine particles mixed thereto is applied by spin coating, etc., to a specified thickness on the surface of the magnetic recording medium 6. By driving the system while bringing the recording/reading head into contact with the surface of the magnetic recording medium 6 through the magnetic fluid 4, the magnetic field on the surface of the magnetic recording medium 6 is connected with the recording/reading head, which substantially renders the recording/reading head in a contact state with the surface of the magnetic recording medium. Thus, the same effect as that of narrowing the gap can be obtained and high density recording is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-density magnetic recording device (including a high-density magneto-optical recording device) and a recording medium used therein.

BACKGROUND OF THE INVENTION Conventional magnetic recording devices record and read information by scanning by disposing a recording/reading head with an arbitrary gap on the surface of a magnetic recording medium. , it is necessary to make the gap as small as possible.

Problem to be Solved by the Invention However, if the gap is made smaller, the head and the surface of the magnetic recording medium will collide and the device will be destroyed during driving, so there is a limit to making the gap smaller, and the performance is poor for high-density recording. It was insufficient.

Furthermore, in order to minimize the distance between the recording layer of the magnetic recording medium and the recording or reading section of the head, it is necessary to form a protective film on the recording layer and to apply a lubricant to provide lubricity as thinly as possible. .

However, the problem with forming a protective film and applying a lubricant is that the thinner it becomes, the more uneven it becomes, making it impossible to obtain sufficient durability, and achieving sufficient reliability and increasing density are contradictory. there were.

In view of the above-mentioned drawbacks of the conventional apparatus, the present invention has been made to substantially achieve the same effect as that achieved by reducing the distance between the recording layer of the magnetic recording medium and the recording or reading section of the head without reducing the distance. The purpose is to realize high-density recording and improve the reliability of magnetic recording devices.

Means for Solving the Problems The present invention brings the recording/reading head and the surface of the magnetic recording medium into contact with each other via a magnetic fluid and drives the recording layer of the magnetic recording medium and the recording or reading section of the head. The feature is that without making the distance extremely small, the same effect as that achieved by making it extremely small is achieved, substantially realizing high-density recording and improving the reliability of the magnetic recording device. That is.

The magnetic recording medium includes not only ordinary magnetic recording media but also magneto-optical recording media. The preferred subaxial fluid is one composed of fluorine-based oil and magnetic particles.

Further, by applying magnetic fluid to each of the recording/reading head and the surface of the magnetic recording medium, or by applying magnetic fluid only to the surface of the recording/reading head, the head and the surface of the medium are brought into contact via the magnetic fluid. It can be configured as follows.

Furthermore, the present invention provides a magnetic recording medium in which a magnetic fluid is coated on the surface of the magnetic recording surface, and in this case, even if a normal magnetic recording device is used, the head and the surface of the medium are Contact can be made via fluid.

By driving the recording/reading head and the surface of the magnetic recording medium in contact with each other via a magnetic fluid, the magnetic fields of the recording/reading head and the surface of the magnetic recording medium can be connected by a fluid magnet, so that the magnetic field of the recording/reading head and the surface of the magnetic recording medium can be connected by a fluid magnet. This has the effect of bringing the recording layer into contact with the recording or reading section of the head. Therefore, even if the recording/reading head does not come into contact with the surface of the magnetic recording medium, the same effect as when the gap is made very narrow can be achieved, and high-density recording can be achieved.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, the magnetic recording medium 6 includes a magnetic recording layer 2 (Fe-Ni, Ni-Co...) formed on a magnetic recording disk substrate (medium base) 1 by sputtering or the like.
After forming a magnetic metal (magnetic metal or magnetic metal oxide film such as . The surface of the magnetic recording medium 6 is coated with a magnetic fluid 4 having a fluorine-based oil base and mixed with magnetic fine particles to a predetermined thickness (appropriately 1 micron or less) using a spinner or the like.

On the other hand, as shown in FIG. 2, the magnetic fluid 4 is also applied to the magnetic recording disk 5 by a dipping method.

Thereafter, as shown in FIG. 3, it is assembled into a disk drive device and adjusted so that the recording/reading head 5 and the surface of the magnetic recording medium 6 can be brought into contact with each other via the magnetic fluid 4 and driven.

In such a configuration, since the magnetic fluid 4 acts as a lubricant, it is possible to drive the recording/reading head 5 and the surface of the magnetic recording medium 6 by bringing them into contact via the magnetic fluid 4.

In addition, since the magnetic field of the recording/reading head 5 and the surface of the magnetic recording medium 6 can be connected by a fluid magnet, the effect is substantially the same as that of bringing the recording layer of the recording medium into contact with the recording or reading section of the head. Obtained. Therefore, although the recording/reading head 5 and the surface of the magnetic recording medium 6 are not in contact, high-density recording (100 Mbit/3.5 inches in diameter) can be easily achieved by simply narrowing the gap between the recording/reading head 5. did it.

In addition, as the magnetic fluid 4 to be used, in addition to magnetic fluids based on fluorine-based oil, those based on hydrocarbon-based or Si-based oils could also be used; The case using magnetic fluid was the most durable. On the other hand, although magnetite is used as the magnetic fine particles of the magnetic fluid 4, it is desirable that the particle size of the magnetite is equal to or smaller than the Herad gap.

In the above embodiment, a magnetic disk device was explained as an example, but magnetic tapes, magnetic cards, and magneto-optical recording media using a transparent material such as PMMA as a medium base and the like may also be used. Needless to say, the present invention can be applied to optical recording devices using.

For example, in order to create a magneto-optical recording device, it is necessary to use a transparent material such as PMMA as the medium base in the magneto-optical recording device, which is composed of at least a light irradiation optical system, a magneto-optical recording/reading head, and a magneto-optical recording medium. If a magneto-optical recording medium is created using a magneto-optical recording medium, a light beam can be easily irradiated from the back side.On the other hand, the magneto-optical recording/reading head and the surface of the magneto-optical recording medium can be brought into contact via a magnetic fluid and driven. Since this is possible, high-density recording can be achieved even with magneto-optical recording devices.

Effects of the Invention According to the present invention, high-density recording can be realized without substantially reducing the distance between the recording layer of the magnetic recording medium and the recording or reading section of the recording/reading head, and
The reliability of the magnetic recording device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a magnetic recording medium according to an embodiment of the present invention, FIG. 2 is a sectional view showing its recording/reading head, and FIG. 3 is a sectional view showing its magnetic recording device. Ferrofluid magnetic recording head magnetic recording medium

Claims (4)

[Claims] (1) A magnetic recording device characterized in that it is driven by bringing a recording/reading head into contact with the surface of a magnetic recording medium via a magnetic fluid. (2) The magnetic recording device according to claim 1, wherein the magnetic fluid is composed of fluorine-based oil and magnetic fine particles. (3) A magnetic recording medium characterized by having a magnetic recording surface coated with a magnetic fluid. (4) The magnetic recording medium according to claim 3, wherein the magnetic fluid is composed of fluorine-based oil and magnetic fine particles.