JPS60106017A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the recording density characteristics due to the tip wear of a main magnetic pole, by increasing the wear resistance to contact between a nonmagnetic material and a recording medium compared with the wear resistance of a holding material. CONSTITUTION:A material having large wear resistance to contact driving of a recording medium 4 compared with a holding member 7 uses a nonmagnetic material 2 which holds a thin film 3 of high permability. Therefore, the wear degree of the member 7 is larger than that of a main magnetic pole 1, and a gap 9 is produced at the area of the member 7. Then the tip part 10 of the pole 1 always hold a good contact state with the medium 4 with no gap. As a result, the high recording density is never deteriorated. For combination of both materials 2 and 7, a material of high hardness containing mainly Al2O3, etc. is used for the material 2 with a material containing mainly glass, etc. used for the material 7 respectively. It is desirable to use the material 7 which has lower hardness than the material 2 and is easily worn out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head that performs recording and reproduction in a direction perpendicular to a recording medium.

Conventional configuration and its problems A perpendicular magnetic recording method has been proposed as a method for performing high-density magnetic recording (see, for example, Japanese Patent Application Laid-Open No. 52-134708 and 2% Japanese Patent Application Laid-open No. 53-3209). has the advantage of having a small demagnetizing field for recorded magnetization and can perform high-density magnetic recording, but it requires a recording medium with perpendicular anisotropy and a rad for perpendicular magnetic recording with a strong magnetic field in the perpendicular direction. Figure 1 shows an example of a conventionally proposed perpendicular magnetic recording head.The main pole 1 has a high magnetic permeability thin film 3 sandwiched between non-magnetic materials 2, and the tip of the thin film 3 is connected to the recording medium. The coil 6, which is in contact with the perpendicular anisotropic magnetic film 6 on the surface of 4, is wound around the main magnetic pole 10, and a holding member 7 that holds the entire main magnetic pole 1 is wound around the main magnetic pole 10.
is outside the main magnetic pole 1. In many perpendicular magnetic recording systems, as in this example, all recording and reproduction is performed by running the main magnetic pole 1 and the recording medium 4 in contact with each other. However, if a gap is created without contact, the recording density decreases and the original perpendicular This is because the high density of magnetic recording cannot be utilized. However, in order to create perpendicular anisotropy in the recording medium 4, a CoOr gold metal sputtered or evaporated thin film is generally used for the perpendicularly anisotropic magnetic film 6.
Since this alloy is hard, wear on the surface of the magnetic head poses a major problem in terms of durability.

FIG. 2 shows a state in which the surface of the head of this example shown in FIG. 1 has been worn out due to long-term use, and the same parts are given the same numbers. The tip of the main magnetic pole 1 of the head where it comes into most contact with the recording medium 4 is worn out, creating a gap 8. As a result, the recording density characteristics of the head are significantly reduced (generally, it is known that the output decreases exponentially at high recording densities due to the generation of voids, resulting in a significant deterioration of the high recording density characteristics). As mentioned above, conventional perpendicular magnetic recording heads have at least one
When used in the open air, the tip of the main pole 1, which is in most contact with the recording medium 4, is worn out, which has the drawback of significantly deteriorating the high recording density characteristics.

OBJECTS OF THE INVENTION In order to solve this problem, it is an object of the present invention to provide a magnetic head that rain-proofs the recording density characteristics from deteriorating due to wear of the tip of the main pole.

Structure of the Invention The present invention achieves the above object, and includes a main magnetic pole having a structure including at least a portion in which a high magnetic permeability thin film is sandwiched between non-magnetic materials, and a holding material that holds the main magnetic pole. The present invention provides a magnetic head whose abrasion resistance against contact with a recording medium of a non-magnetic material is greater than the abrasion resistance of the holding material.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows the state of wear of a magnetic head according to an embodiment of the present invention after long-term use. The same parts as in Figure 1 are all labeled with the same numbers.

The feature of this embodiment is that the non-magnetic material 2 that holds the high magnetic permeability thin film 3 is made of a material that has greater wear resistance than the holding material 7 against the contact running of the recording medium 4. The wear amount of γ is larger than the wear amount of main pole 1,
A gap 9 is generated in the holding material 7 portion, and the tip portion 10 of the main pole 1 always maintains a good contact state with the recording medium 4 without a gap, so that the high recording density property is not deteriorated. For such a combination of the non-magnetic material 2 and the holding material 7, for example, the non-magnetic material 2 may be a material with high hardness mainly composed of Al2O5, SiC, Tie, BN, etc., and the holding material 7 may be a material with high hardness such as glass. , 5i02, TiBaO, etc., which have lower hardness and wear resistance compared to the non-magnetic material 2, are preferable.

FIG. 4 shows another embodiment, in which the same parts in FIG. Holding material 11 like this is connected to form a magnetic circuit.
By serving as part of the magnetic circuit, a highly efficient head can be constructed.

In this example as well, the holding material 1 made of a high magnetic permeability material
If the wear resistance of the non-magnetic material 2 sandwiching the high magnetic permeability thin film 3 against the contact running of the recording medium 4 is greater than the 1 mJ abrasion resistance of 10 does not occur. Such a holding member 11 with high magnetic permeability
For example, ferrite, Fe--Ni alloy, etc. are preferable.

In this pigeon house as well, there is no deterioration in the characteristics of the degree of air flow.

Effects of the Invention (2) In short, the present invention comprises a main magnetic pole having at least a portion in which a high magnetic permeability thin film is sandwiched between non-magnetic materials, and a holding material that holds the main magnetic pole, and a holding material that holds the main magnetic pole. The present invention provides a magnetic head characterized in that the wear resistance against contact with a recording medium is greater than the wear resistance of the holding material, and the wear resistance of the non-magnetic material of the main pole is higher than that of the holding material. By increasing the abrasion resistance, it is possible to eliminate the occurrence of a gap at the tip of the main pole due to wear, and has the advantage that high recording density characteristics do not deteriorate even when running in contact with a recording medium for a long time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional perpendicular magnetic recording head, FIG. 2 is a schematic diagram showing a worn state of a conventional perpendicular magnetic recording head, and FIG. 3 is a worn state of a magnetic head in an embodiment of the present invention. FIG. 4 is a schematic diagram showing the state of wear of the magnetic head in an embodiment of the present invention. 1...Main magnetic pole, 2...Nonmagnetic material, 3
...High magnetic permeability thin film, 4...Recording medium, 5...Vertical anisotropic magnetic film, 6...Coil, 7, 11... ...Holding material, 8゜9...
...Air gap, 10... Main pole tip. Name of agent: Toshio Nakao, Physician, and 1 other person Figure 1 Figure 3 Figure 4

Claims (2)

[Claims] (1) A main magnetic pole having a structure including at least a portion in which a high magnetic permeability thin film is sandwiched between nonmagnetic materials, and a holding material that holds the main magnetic pole, and which prevents the nonmagnetic material from coming into contact with a recording medium. A magnetic head characterized in that the wear resistance is greater than that of the holding material. (2) The magnetic head according to claim 1, wherein the holding material l#I is made of a high magnetic permeability material and is configured to also serve as a part of the magnetic circuit.