JPH0240115A - Magnetic head for perpendicular magnetic recording - Google Patents

Abstract

PURPOSE:To obtain a magnetic head easily manufactured and with a low price and suitable for recording with high density by performing the glass joint of a reverse L-shape soft magnetic core and a magnetic core for magnetic reflux integrally so as to form one magnetic path by a soft magnetic back core interposing nonmagnetic ceramic in its center, and forming the magnetic head with structure of two tracks. CONSTITUTION:The shape of the soft magnetic core 3 which forms the magnetic circuit of a main magnetic pole 1 is formed in such a way that a part being brought into contact with a nonmagnetic slider 2 made of ceramic is formed in shape protruding in reverse L-shape where a tapered part is provided so as to enable the main magnetic pole 1 forming the two tracks to approach. In two main magnetic pole excitation type single magnetic pole magnetic heads, the magnetic circuit comprises a closed circuit magnetically by the soft magnetic back core 6 except for the main magnetic pole part 1. On those two magnetic heads, glass sticking is applied integrally by the nonmagnetic slider 2 on which the main magnetic pole 1 is mounted and a nonmagnetic block to connect the back core 6, and winding is applied on the reverse L-shape soft magnetic cores 3, respectively. In such a way, it is possible to obtain a main magnetic pole excitation type magnetic head for two track perpendicular magnetic recording with easily manufactured and with the low price and suitable for the magnetic recording with high density.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to a main pole excitation type two-track perpendicular magnetic recording magnetic head used in still video floppies, etc., and a method for manufacturing the same. be.

[Conventional technology]

Conventionally, when recording on a magnetic recording medium, the mainstream has been a longitudinal recording method (also called longitudinal recording because magnetization occurs in the in-plane direction of the recording medium) in which recording is performed by magnetizing in the direction of movement of a magnetic head. However, when the magnetic recording density is increased, it is known that the perpendicular magnetic recording method, which magnetizes the magnetic recording medium in the thickness direction, is superior in principle. This is because in the longitudinal recording method, the shorter the wavelength of the magnetic recording signal, the greater the self-demagnetizing effect of the magnetic recording signal, whereas in the perpendicular magnetic recording method, the higher the magnetic recording density of the recorded magnetic layer, the greater the self-demagnetizing effect of the magnetic recording signal. This is due to the characteristic that self-demagnetization is small, so it is inherently easy to increase the density.

On the other hand, in the case of longitudinal recording systems, the development of high coercive force media and accompanying high-performance magnetic heads has progressed, and 8 mm video, rotary digital audio tapes, still video floppies, etc. are being commercialized one after another. In particular, magnetic heads for still video floppies use a two-track magnetic head that makes full use of thin film technology to enable a recording and reproducing system that does not perform interlaced recording, so-called frame recording and reproducing. However, this two-track magnetic head for still video floppies uses a thin-film head shown in Figure 8, which uses thin-film technology to form the magnetic poles and windings during the manufacturing process, and the yield rate is low due to the strict manufacturing conditions. It's bad and the cost is high. Furthermore, the current still video floppy has a low resolution (horizontal resolution of 200 to 300 lines), and although there is a strong demand for higher resolution, it uses a longitudinal recording method, which limits the ability to increase magnetic recording density. There's a problem.

[Problem to be solved by the invention]

In order to solve the above-mentioned problems of the prior art, the present invention uses a main pole excitation type dual magnetic recording system that uses a perpendicular magnetic recording system, has a high magnetic recording density, and is easy to manufacture and capable of high-density magnetic recording at low cost. A magnetic head for track perpendicular magnetic recording is provided.

Structure of the Invention [Means for Solving the Problems] The present invention provides a main pole excitation type single pole magnetic head for perpendicular recording having a main pole made of a soft magnetic thin film, which includes a soft magnetic core bonded to a nonmagnetic slider. , 2 as shown in Figures 1 and 2
The shape of the soft magnetic core of the main pole forming part is processed into an inverted shape to facilitate the winding of the track, and the main pole made of a soft magnetic thin film is similarly shaped as shown in Figures 2 and 6. After preparing two soft magnetic core halves of the same shape and joining them together with their main pole faces facing each other, winding is applied to the center of the two soft magnetic cores as shown in Figure 3. A back core consisting of a soft magnetic core with blocks of non-magnetic ceramics or other non-magnetic materials bonded together to form a U-shaped magnetic circuit with respect to the main pole, which is easier to manufacture than thin-film magnetic heads. The present invention provides a two-track perpendicular magnetic recording head that has a high yield and is inexpensive.

That is, in the present invention, the top part of the soft magnetic core whose tip forming the main magnetic pole is formed into an inverted shape, and the top part of the soft magnetic core which is separated from the main magnetic pole surface and which circulates the magnetic flux passing through the main magnetic pole, are made of a ceramic non-woven material. A magnetic head element is formed by forming a main magnetic pole on the surface of a soft magnetic core formed in an inverted shape in the direction in which the two magnetic cores are aligned and on the surface of a non-magnetic slider, which are bonded together with glass by a magnetic slider. Two elements are prepared, the main magnetic pole surfaces of the two magnetic head elements are in the same plane direction, and the main magnetic pole surfaces are opposite to each other, a soft magnetic back core with non-magnetic ceramic sandwiched in the center, and an inverted-shaped soft magnetic core. and a magnetic core for magnetic flux circulation, and glass bonded together to create one magnetic path.
This is a magnetic head for perpendicular magnetic recording characterized by having a two-track structure.

[Effect]

The shape of the soft magnetic core that forms the magnetic circuit of the main magnetic pole is such that the part that contacts the non-magnetic slider made of ceramic is tapered and protrudes in an inverted shape so that the main magnetic poles forming two tracks can approach each other. , the two main pole excitation type single pole magnetic heads have a soft magnetic back core that forms a magnetically closed circuit except for the main pole part, and the two magnetic heads are non-magnetic sliders with the main pole attached. , a two-track perpendicular magnetic recording magnetic head consisting of a highly reliable main-pole-excited single magnetic pole, which is integrally glass-bonded with a non-magnetic block that connects the back core, and windings are applied to each inverted-shaped soft magnetic core. Configure.

〔Example〕

An embodiment of the magnetic head for perpendicular magnetic recording according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a magnetic head for two-track perpendicular magnetic recording according to an embodiment of the present invention.

The surface of the nonmagnetic slider (calcium titanate, alumina, etc.) 2 is provided with a main magnetic pole 1 made of a thin film of Co-based amorphous, sendust, permalloy, etc., and has a rounded or spherical surface to improve contact with the recording medium. The surface of the non-magnetic slider 2 is polished and has two tracks of main magnetic poles 1 for writing and reading data on the magnetic recording surface.

FIGS. 2(a) and 2(b) are perspective views showing the structure of two main pole forming portions and a magnetic circuit of a magnetic head for perpendicular magnetic recording according to the present invention. Made of ferrite material with soft magnetic properties,
The inverted-shaped soft magnetic core 3 for forming the main magnetic pole and the soft magnetic core 5 for magnetic flux circulation, which form the magnetic circuit of the magnetic head, are configured so that the magnetic flux generated by the two-track winding (0.01 to 0.05 mmφ) is The dimensions and shape are such that they do not interfere with each other. For example, according to the still video floppy standard, the track width of the main pole is 60μm, and the track pitch is 100μm.
m (therefore the distance between tracks is 40 μm) and 0.03 m
Even when winding is performed using a wire of mφ, a winding space equivalent to the track pitch is required for two tracks. In the magnetic head for perpendicular magnetic recording of the present invention, the main magnetic pole 1 is formed on the inverted-shaped soft magnetic core that forms the main magnetic pole, as shown in FIG. The magnetic flux circulation soft magnetic core 5, which is provided with wire 4 and circulates the magnetic flux generated by the main magnetic pole, is attached to a ceramic non-magnetic slider at an appropriate distance from the main magnetic pole surface, thereby forming a two-track main magnetic pole. The structure is such that when the two magnetic heads are brought close to each other on the slider surface, magnetic interference will not occur between the two magnetic heads between the magnetic circuits of the two tracks. The forming part of the main magnetic pole 1 of the soft magnetic core that forms the main magnetic pole has an inverted-shaped tip at the adhesive part with the non-magnetic slider, and the magnetic flux circulating soft magnetic core 5 that forms the magnetic path of the circulating magnetic flux has the main magnetic pole 1 By forming the forming part at a position shifted from the main pole surface due to the structure, winding space for two tracks is secured, and since the back core is a structure that is attached later, winding can be done easily. , has the advantage of being excellent in mass production.

An example of the manufacturing process of the magnetic head will be described below.

In Fig. 4, a soft magnetic block 9 made of a ferrite core having soft magnetic properties is processed according to the broken line, and a non-magnetic slider 2 made of ceramic such as glass, calcium titanate, sapphire, etc. is made soft magnetic as shown in Fig. 5. It is joined to the tip of block 9. There are various bonding methods, but glass bonding is the most common. Next, the cut portion 15 is removed by cutting along the broken line shown in FIG. After that, the main pole film 1 is
As shown in FIG. 6, a film is formed on the soft magnetic core surface and the nonmagnetic slider surface to form the main magnetic pole. The portion formed in a portion of the non-magnetic slider corresponds to the track width for writing and reading. As shown in FIG. 7, the back core 6 shown in FIG.
1 are stacked and bonded, and cut along the broken line 16. 6th
Two blocks in which the main magnetic pole is formed on the inverted-shaped soft magnetic core and the ceramic non-magnetic slider shown in the figure are placed facing each other and butted together, joined together with glass, resin, etc., and then the first
The perpendicular magnetic recording according to the present invention shown in FIG. A magnetic head for use is formed.

As an example of the dimensions of the magnetic head according to the present invention, an outer diameter of approximately 3
mm cubic, the pitch between two tracks is 100 μm
, the track width is 60 μm, and the thickness of the magnetic material of the main pole is 0.2
~0.3 μm.

C6 Effects of the Invention As described above, the main pole excitation type two-track magnetic head for perpendicular magnetic recording according to the present invention is easy to manufacture and inexpensive, and is suitable for high-density magnetic recording, particularly for use in still video floppies. It has now become possible to provide a magnetic head for perpendicular magnetic recording that is effective.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head for two-track perpendicular magnetic recording according to the present invention. FIGS. 2(a) and 2(b) are perspective views showing the structure of a main pole forming portion of a magnetic head for two-track perpendicular magnetic recording according to the present invention having the same structure. FIG. 3 is a perspective view of the back core. FIG. 4 is a perspective view showing a soft magnetic core in an intermediate step of manufacturing a magnetic head. FIG. 5 is a perspective view showing a processed part in which a ceramic non-magnetic slider is bonded to a soft magnetic core to form a soft magnetic core that forms an inverted main magnetic pole and a soft magnetic core for magnetic flux circulation. . FIG. 6 is a perspective view showing an inverted-shaped soft magnetic core half-shaped with a main magnetic pole film formed thereon. FIG. 7 is a perspective view showing a core block during back core manufacture. FIG. 8 is a perspective view showing a thin film magnetic head. 1... Main magnetic pole, 2... Non-magnetic slider, 3...
Reverse-shaped soft magnetic core, 4... Winding wire, 5... Soft magnetic core for magnetic flux circulation, 6... Back core, 7, 11... Non-magnetic ceramics, 8... Non-magnetic bonding agent , 9.10・
... Soft magnetic block, 15 ... Cutting part, 16 ... Broken line, 20 ... Gap part, 21 ... Upper magnetic core, 22
...lower magnetic core, 23...coil.

Claims (1)

[Claims] 1. The top of the soft magnetic core, whose tip forms the main magnetic pole is shaped into an inverted L shape, and the top of the soft magnetic core, which is separated from the main magnetic pole surface and circulates the magnetic flux passing through the main magnetic pole, are connected by a ceramic non-magnetic slider. A main magnetic pole is formed on the surface of the soft magnetic core and the surface of the nonmagnetic slider, which are bonded together with glass and formed into an inverted L shape in the direction in which the two magnetic cores are lined up, to form a magnetic head element. The main pole surfaces of the two magnetic head elements face each other in the same plane direction, and a soft magnetic back core with non-magnetic ceramics sandwiched in the center allows magnetic flux circulation with the inverted L-shaped soft magnetic core. 1. A magnetic head for perpendicular magnetic recording, characterized in that it has a two-track structure by integrally glass-bonding it with a magnetic core to form one magnetic path.