JPH02201713A - Magnetic head and production thereof - Google Patents

Abstract

PURPOSE:To improve wear resistance by butting a pair of magnetic core half bodies, which are formed by inserting ferromagnetic metallic films between a pair of flat plate materials coated one end inclusive of recording medium- sliding surfaces with carbon films, against each other via a nonmagnetic material. CONSTITUTION:Both the magnetic core half bodies 11, 12 consist of a pair of the flat plate materials 11a, 11b, 12a, 12b consisting of ferrite magnetic materials, etc., in the state of coating one end part inclusive of the recording medium-sliding surfaces 13 with the amorphous carbon films and the ferromagnetic metallic films 14 inserted between a pair of these flat plate materials 11a, 11b, 12a, 12b. These two magnetic cores 11, 12 are butted against each other via the gap spacer material and the magnetic gap 16 is formed between the ferromagnetic metallic films 14 on the recording medium-sliding surfaces 13. The recording medium-sliding surfaces 13 of the magnetic head 10 are constituted of only the ferromagnetic metallic films 14 and the carbon films C in such a manner and, therefore, the magnetic head having the extremely good wear resistance is obtd.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a magnetic head used in a magnetic recording/reproducing device, and particularly relates to a magnetic head in which amorphous carbon or the like is formed on a tape sliding surface by vacuum thin film forming technology. Related to a magnetic head (prior art) A magnetic recording and reproducing method in which recording and reproducing operations of information signals are performed magnetically includes an operation of recording information signals on a magnetic recording medium and an operation of reproducing information signals from the magnetic recording medium. It has been widely adopted as a means for recording and reproducing information signals in many technical fields because it is extremely easy to perform this. As the field of magnetic recording and reproduction increases, magnetic materials with high coercive force are used as magnetic recording media, and by narrowing the recording trace (track), information signals are recorded and reproduced at high density. Things started to happen.

As magnetic materials with high coercive force have come to be used in magnetic recording media, magnetic materials used in magnetic heads are also becoming more popular.
As magnetic materials with high saturation magnetic flux density are now required, it is no longer possible to maintain information signals in a satisfactory state by constructing the core of a magnetic head using only a ferromagnetic oxide magnetic material (ferrite magnetic material) as in the past. As a magnetic head, part or all of its core is made of a magnetic material with a high saturation magnetic flux density, such as a ferromagnetic alloy, which cannot record on a magnetic recording medium.
A structure made of amorphous ferromagnetic material has been proposed.

In other words, as a magnetic material used in magnetic recording media,
For example, when trying to express high-density magnetic recording retrieval using a magnetic recording medium with a coercive force of 10,000e, it is difficult to achieve saturation when magnetically recording information signals on the magnetic recording medium and reproducing information signals from the magnetic recording medium. For example, if the magnetic flux density is 5
Even if a magnetic head using a 200 Gauss polycrystalline ferrite for the magnetic core is used, it is not possible to perform magnetic recording retrieval on the above-mentioned magnetic recording medium satisfactorily.

Therefore, magnetic heads used for recording and reproducing operations on magnetic recording media in which magnetic materials with high coercive force are used as described above, such as Sendust alloy with a saturation magnetic flux density of 9,500 to 12,500 Gauss, are used. A thin film made of a magnetic material with a large saturation magnetic flux density,
A configuration has been proposed in which vacuum film formation technology (vacuum thin film formation technology) is applied only to the vicinity of the part of the magnetic core made of ferromagnetic oxide magnetic material (ferrite magnetic material) that contacts the magnetic recording medium. .

By the way, a magnetic circuit is formed by forming a thin film of ferromagnetic metal on a magnetic core made of a ferromagnetic oxide magnetic material (ferrite magnetic material) using vacuum film forming technology, and forming a narrow track in the thin film of ferromagnetic metal. For example, a magnetic head having a magnetic gap formed therein is disclosed in Japanese Patent Application Laid-Open No. 60-18250.
As disclosed in Publication No. 7, a magnetic head is proposed that has a sliding surface with good wear resistance in a narrow track made of a highly hard non-magnetic material and a thin film of ferromagnetic metal. has been done.

On the other hand, in recent years, a magnetic head having a structure called a thin film magnetic head has been proposed in which a lower magnetic layer, a gap layer, a conductive coil layer, and an upper magnetic layer are sequentially formed on a substrate by vacuum thin film forming technology. According to this thin film magnetic head, for example,
As disclosed in Japanese Patent Application No. 63-182152, each layer is flat, so there is no deterioration in the characteristics of the magnetic core, and the magnetic path through the magnetic core can be shortened.

(Problems to be Solved by the Invention) In the magnetic head of the conventional configuration described above, magnetic heald is used as a material used in manufacturing the magnetic heald to construct the sliding surface that has wear resistance. A block material of ferrite magnetic material corresponding to the part to be formed as the magnetic core and a highly hard non-magnetic wear-resistant block material constituting the sliding surface, such as a glass or ceramic block material, are welded together. is used.

However, when manufacturing a magnetic head, the above-mentioned materials, that is, a block of ferrite magnetic material and a block of high hardness non-magnetic wear-resistant material, such as a glass block, are welded together. When this material is used as a material for a magnetic head, the number of steps required to manufacture the magnetic head becomes extremely large.

Additionally, when carbon blocks are used instead of glass or ceramics, it is difficult to form ferromagnetic metal films or nonmagnetic films on this material using vacuum thin film forming technology due to problems such as adhesion. .

Also, in the case of a magnetic head with a configuration called a thin-film magnetic head, for example, when a carphone substrate is used, a ferromagnetic metal film or a non-magnetic film is formed by vacuum thin film forming technology, as described above. This was difficult due to problems such as adhesion.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and is made of a ferrite magnetic material or a non-magnetic material, and at least one end including the recording medium sliding surface is coated with a carbon film. A pair of magnetic core halves formed by sandwiching a ferromagnetic metal film between a pair of flat plate materials are butted together via a non-magnetic material, and the ferromagnetic metal crotch is placed on the recording medium sliding surface. A magnetic head and its manufacturing method are characterized in that an upper core and a lower core made of a ferromagnetic metal thin film are formed on a substrate with a non-magnetic film interposed therebetween, and one end of these is In a magnetic head in which a side surface of the substrate forms a recording medium sliding surface, a carbon film is interposed between at least the upper core and the substrate, and one end of the carbon film forms a part of the recording medium sliding surface. The present invention provides a magnetic head characterized by forming a magnetic head.

(Example of Actual Glaze) Example 1 FIG. 1 is a perspective view showing a magnetic head 10 according to the present invention. In the figure, reference numerals 11 and 12 indicate magnetic core halves.

The remagnetic core halves 11 and 12 are made of an amorphous carbon film (glassy carbon), a carbon film having a diamond structure, or a mixed crystal having both an amorphous structure and a diamond structure at one end including the recording medium sliding surface 13. A pair of flat plates 11a and 11 made of a ferrite magnetic material such as MnZn single crystal ferrite, etc., uniformly covered with a carbon film (hereinafter referred to as carbon film) C.
b, and 12a, 12b, and these pair of flat plates 11a
, llb, and a ferromagnetic metal film 14 sandwiched between 12a and 12b.

Further, a winding groove 15 is formed in the magnetic core half 11. These remagnetic cores 11 and 12 are butted together via a gap spacer material g, similar to a general magnetic head.
A magnetic cap 16 is formed between the ferromagnetic metal films 14 on the recording medium sliding surface 13 .

In this way, since the recording medium sliding surface 13 of the magnetic head 10 is composed only of the ferromagnetic metal film 14 and the carbon film C, a magnetic helad with extremely excellent wear resistance can be obtained. Further, there is less damage to recording media such as magnetic tapes, and the durability of the recording media is increased.

The method for manufacturing the magnetic head 10 as described above is performed in steps (A) to (
Shown in F). FIGS. 2(a) to 2(h) are diagonal perspective views illustrating a method of manufacturing the magnetic head 10 according to the present invention.

This will be explained below using the same figure.

Step (A) First, as shown in figure fa), for example, MnZ
n flat plate material A having the same shape from a core block made of a ferrite magnetic material such as single crystal ferrite;

Form B.

Step (B) For example, CVD is applied to the upper portions of the flat plates A and B, including the portions 13a and 13b that will later become the recording medium sliding surfaces.
The carbon film C is formed by a vacuum thin film forming technique such as the method. ((b) in the same figure) Step (C) After the carbon film C is formed on the entire surface of the flat plate material A, a ferromagnetic metal is formed on the surface intersecting the surface that will become the recording medium sliding surface using vacuum thin film forming technology. 1!14
For example, sendust or the like is formed. ((C) in the same figure) Process <D) Flat plate material A with ferromagnetic metal v14 formed
and the flat plate material B is the ferromagnetic metal Jl! 14, and are bonded by, for example, a glass bonding method. ((d) in the same figure) Step (E) Next, when viewed from the recording medium sliding surface 13, a pair of magnetic cores are cut along the cutting line S-8 in a direction perpendicular to the ferromagnetic metal film 14. Obtain halves 11°12. Next, a winding groove 15 is formed on the abutting surface of at least one core half 11.
formation. ((e), (f) in the figure) Step (F) After forming a gap spacer material g such as SiO2 on a part of the abutting surfaces by vacuum thin film forming technology or the like, the pair of magnetic core halves 11 are formed. .12 butt and join together. As a result, the recording medium sliding surface 13
A magnetic head 10 shown in FIG. 1 having a magnetic gap 16 thereon is obtained.

(FIGS. 2 (q), (h)) As described above, according to the method of manufacturing the magnetic head 10 according to the present invention, since the carbon film is formed by vacuum thin film forming technology, it is possible to form the carbon film with the bulk carbon substrate. Compare ferromagnetic metal Jl! It is easy to join with 14, and the manufacturing process is simple.

Example 2 In Example 1, a pair of flat plates 11a.

Although a magnetic material made of ferrite magnetic material was used as the material 11b, another example is the flat plate material 11a.

It can also be applied to a case where a non-magnetic material such as ceramics is used for the material 11b, and it can also be manufactured by the above-mentioned manufacturing process.

In this case, by applying a carphone film to the sliding surface of a recording medium such as a tape, the magnetic recording medium such as a tape is not damaged.

Embodiment 3 FIG. 3 is a sectional view showing another embodiment 20 of the magnetic head according to the present invention. In the figure, reference numeral 21 denotes a carbon film, which is formed on the substrate 22 at least in a portion corresponding to the gap depth A, and the tip of this film forms part of the recording medium sliding surface 23 together with the side surface of the substrate 22. . Carbon l! 21 and the substrate 22, a lower core 24 made of a ferromagnetic metal film such as Sendust is formed. lower core 2
On top of 4 is a gap spacer material 25. First insulating film 2
6. Conductor coil 27. Second insulation wA28. upper core 29
are sequentially formed, and on top of these, at least in a portion corresponding to the gap dibs layer, a recording medium sliding surface 23 is formed.
A carbon film 30 is formed so as to form a part of the carbon film 30 . Furthermore, a protective film 31 is formed on this to constitute the magnetic head 20.

In such a magnetic head 20, the upper and lower carbon films 30 and 21 form a lower core 29. It has a structure that sandwiches or surrounds the lower core 24 and the gap spacer material 25, and as in the first embodiment, the part that the magnetic recording medium comes into contact with is the two upper cores and the lower core 24, which are made of ferromagnetic metal films. and carbon film 2130, it has very good wear resistance.

(Effects of the Invention) As described above, according to the magnetic head of the present invention, the magnetic head is made of a ferrite magnetic material or a non-magnetic material, and is made of a pair of flat plate members whose ends including at least the recording medium sliding surface are coated with a carbon film. A pair of magnetic core halves formed by sandwiching a ferromagnetic metal film are butted together via a non-magnetic material, and a magnetic gap is formed between the ferromagnetic metal films on the recording medium sliding surface. An upper core and a lower core made of a ferromagnetic metal thin film are formed on a substrate via a non-magnetic film, and one end of these cores forms a recording medium sliding surface with the side surface of the substrate. The magnetic head is characterized in that a carbon film is interposed between at least the upper core and the substrate, and one end of the carbon film forms a part of the recording medium sliding surface. A magnetic head with good wear resistance can be obtained, and the recording medium will not be damaged. In addition, the number of processing steps required is small, making it possible to manufacture a magnetic head that is cost-effective, and because it uses a carbon film formed by vacuum thin film forming technology, it is easy to bond with other materials. Therefore, it is possible to provide a method for manufacturing a magnetic head with excellent strength and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a magnetic head according to the present invention, FIGS. 2(a) to (b) are perspective views for explaining a method of manufacturing a magnetic head according to the present invention, and FIG. FIG. 3 is a cross-sectional view showing another embodiment of the magnetic head. 10.20...Magnetic head according to the present invention, 11.12
...Magnetic core half, C, 21, 30... Carbon film, 13.23... Recording medium sliding surface, 11a, llb, 12a, 12b, A, B-... Flat plate material, 14. ...Ferromagnetic metal film, 15... Winding groove, g, 2
5... Gap spacer material, 16... Magnetic gap, 24... Lower core, 26... First insulating film, 27
...Conductor coil, 28...Second insulating film, 29...
- Upper core, 31...protective film. Patent applicant: Japan Victor Co., Ltd. Representative: Kunio Kakiki (procedural amendment writing method) April 8th, 1989

Claims (3)

[Claims] (1) A pair of flat plates made of a ferrite magnetic material or a non-magnetic material and having at least one end including the recording medium sliding surface covered with a carbon film, sandwiching a ferromagnetic metal film therebetween. A magnetic head characterized in that magnetic core halves are butted together with a nonmagnetic material interposed therebetween, and a magnetic gap is formed between the ferromagnetic metal films on the recording medium sliding surface. (2) A step of preparing a set of flat plates made of an oxide magnetic material or a non-magnetic material, and coating one end of these flat plates, including the recording medium sliding surface, with a carbon film using vacuum thin film forming technology; forming a ferromagnetic metal film to a uniform thickness on a plane perpendicular to the recording medium sliding surface of the flat plate material by vacuum thin film forming technology; A step of joining one flat plate material to the other flat plate material so as to sandwich the ferromagnetic metal film, and a step of separating a pair of magnetic plates in a direction perpendicular to the recording medium sliding surface and the ferromagnetic metal film. A step of forming core halves and forming a winding structure on the abutting surfaces of at least one magnetic core half, and forming a gap spacer made of a non-magnetic material on the abutting surface of the one magnetic core half by vacuum thin film forming technology. 2. The method of manufacturing a magnetic head according to claim 1, comprising the steps of: forming the gap spacer material; and abutting the two magnetic core halves together via the gap spacer material. (3) A magnetic head in which an upper core and a lower core made of a ferromagnetic metal thin film are formed on a substrate with a nonmagnetic film interposed therebetween, and one end of these forms a recording medium sliding surface together with the side surface of the substrate. A magnetic head characterized in that a carbon film is interposed between at least the upper core and the substrate, and one end of the carbon film forms a part of the recording medium sliding surface.