JPH02227807A - Perpendicular magnetic recording magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To inexpensively manufacture a magnetic head without a special manufacturing device by providing a non-magnetic layer between two tracks, and making a magnetic circuit into a separately arranged structure. CONSTITUTION:With the use of crystallized glass, an Ni-Zn ferrite or an Mn-Zn ferrite 2 and the crystallized glass, which forms an intermediate non-magnetic layer 9, are alternately arranged, and they are thermally press-bonded. Respective blocks are cut in the direction orthogonal to the crystallized glass surface, and a coil groove A is formed. Next, the coil groove A is covered with a nonmagnetic slider 1, they are bonded, the intermediate non-magnetic layer, the slider, and the surface where soft magnetic material emerges are ground to be a mirror surface, and a soft magnetic film 3 to be a main magnetic pole is formed. Further a coil groove B is formed in the direction orthogonal to the coil groove A at a width broader than that of the intermediate non-magnetic layer. Next the intermediate non-magnetic material is cut in the middle, and coils 5a and 5b are wound around the main magnetic pole. Last, non-magnetic sliders 1a and 1b to be sliding surfaces are ground. Thus the magnetic head can be inexpensively manufactured.

Description

Detailed Description of the Invention A88 Purpose of the Invention [Field of Industrial Application] The present invention enables magnetic recording of two fields per frame, which is used for magnetic recording of still video floppies, etc.
The present invention relates to a line 2 track magnetic head for perpendicular magnetic recording and a method of manufacturing the same.

[Conventional technology]

In conventional magnetic recording, most of them use a longitudinal magnetic recording method in which the north and south poles are oriented parallel to the direction of the magnetic recording surface.In order to increase the recording density, high coercive force magnetic recording media and high coercive force are used. Magnetic heads that record on and play back magnetic recording media have been developed, and devices using high-density magnetic recording have been commercialized one after another, such as 8 mm video, rotary digital audio tape, and still video floppies. Video signal recording devices such as VTRs and still videos are required to have even higher magnetic recording densities, and the required performance is 50kFRP in the longitudinal recording method.
At about I, it is almost reaching its limit. Furthermore, in order to record and play back TV screens, still video floppies require two magnetic heads on one line at a predetermined pitch.
At present, a two-track thin film magnetic head using thin film technology is employed, but there are problems such as strict manufacturing conditions, poor yield, and high cost.

[Problem to be solved by the invention]

The present invention enables higher-density magnetic recording than longitudinal recording methods for use in still video floppy disks, etc., and has two tracks per line with one magnetic head for one-line two-track perpendicular magnetic recording. The present invention provides a magnetic head and a method for manufacturing the same.

Structure of the Invention [Means for Solving the Problems] The present invention is desired for still video floppies, etc.
This is a magnetic head for perpendicular magnetic recording that can achieve a magnetic recording density higher than KFRPI, and it also provides a 1-line, 2-track magnetic head that can record and reproduce TV screens. Perpendicular magnetic recording has a structure in which the magnetic circuit is separated by a magnetic layer, and each track has an independent main magnetic pole, auxiliary magnetic pole, and winding, and one magnetic head has two tracks per line. This is a magnetic head for use. The 1-line, 2-track perpendicular magnetic recording magnetic head of the present invention is capable of magnetic recording with high magnetic recording density, and the shape of the main magnetic pole film of the recording/reproducing track uses thin film technology by photoetching, but other steps are not required. This magnetic head can be manufactured without using conventional thin-film magnetic head manufacturing technology, and is characterized by being an easy-to-manufacture magnetic head for 1-line, 2-track perpendicular magnetic recording. That is, the present invention has an auxiliary magnetic pole made of a soft magnetic material, a main magnetic pole made of a soft magnetic thin film, and a slider made of nonmagnetic ceramics on the front surface of the main magnetic pole and the auxiliary magnetic pole provided with a recording/reproducing track for recording and reproducing. In a main pole-excited perpendicular magnetic recording magnetic head, the main pole is wound with a wire, and the main pole and the auxiliary pole are magnetically connected by a back core made of a soft magnetic material on the opposite side of the slider.

2 by inserting a non-magnetic layer between the two recording/reproducing tracks.
The two tracks each have a main magnetic pole located in the center and two auxiliary magnetic poles, and the main magnetic pole and the auxiliary magnetic pole are made of non-magnetic material that magnetically separates each of the two tracks. 1. A magnetic head for 1-line, 2-track perpendicular magnetic recording, characterized in that the two main poles are magnetically connected by a back core inserted in the middle, and each of the two main poles is wound with a wire.

Further, there is provided a method of manufacturing a magnetic head for one-line, two-track perpendicular magnetic recording according to claim 1, which comprises the following steps.

b) Soft magnetic material blocks forming the main magnetic pole and auxiliary magnetic pole and non-magnetic crystallized glass corresponding to the track pitch are laminated alternately to form a multilayer, and heated to a temperature where the amorphous portion of the crystallized glass melts. After bonding under pressure, the first step is to cut the crystallized glass along a plane perpendicular to the bonded surface and end surface, respectively.

Mouth) Cut a first U-shaped groove at right angles to the crystallized glass surface,
The second step is to glass-fuse a ceramic non-magnetic slider plate to the cut end of the U-shaped groove.

C) Share the soft magnetic material block, non-magnetic slider, and crystallized glass, and mirror polish the surface perpendicular to the crystallized glass,
The third step is to sputter a soft magnetic film for the main pole on the mirror-polished surface, and then form two recording/reproducing tracks in a convex shape by etching, with a crystallized glass layer forming an intermediate nonmagnetic layer in between.

2) A fourth step in which the block to which the recording/reproducing track is attached, sandwiching the etched surface of the recording/reproducing track in step (c), and the block with the # surface polished are bonded with a resin at symmetrical positions to each other.

e) Form a second U-shaped groove in the soft magnetic material block along the crystallized glass surface in a direction perpendicular to the first U-shaped groove in the direction of the adhesive surface of the slider material, and A fifth step of grinding the magnetic material block parallel to the surface of the slider material to expose the first U-shaped groove.

f) A sixth method in which main magnetic poles are formed by cutting the middle of the bonded surface of the crystallized glass parallel to the surface, and windings are applied to each of the two main magnetic poles.
process.

g) A seventh step of bonding a soft magnetic material back core with a resin and polishing the non-magnetic slider surface into an R surface or a spherical surface, with a non-magnetic portion of the back core provided in the middle for each track.

[Effect]

In the one-line, two-track perpendicular magnetic recording magnetic head according to the present invention, the intermediate nonmagnetic layer between the two tracks is made of crystallized glass and is fused together with the ferrite that forms the main magnetic pole. The slider to do is
It is formed by glass-fusing calcium titanate non-magnetic material to a soft magnetic block, and the magnetic paths forming two tracks are the main magnetic pole, the auxiliary magnetic pole on both sides of the main magnetic pole, and the main magnetic pole and the two tracks.
It consists of a ferrite back core that is magnetically separated by a back core non-magnetic part that connects two auxiliary magnetic poles, and a non-magnetic layer is inserted in the middle of each track, so a single magnetic head can be used. Two magnetic circuits are configured.

〔Example〕

Hereinafter, embodiments will be described in detail with reference to the drawings. 1 and 2 are perspective views of a magnetic head for one-line, two-track perpendicular magnetic recording according to the present invention.

In FIG. 3, first, in order to form an intermediate nonmagnetic layer 9 for two tracks, a Ni-Z layer is formed using crystallized glass.
N-ferrite or Mn--Zn ferrite 2 and crystallized glass forming the intermediate nonmagnetic layer 9 are alternately arranged and thermocompression bonded. At this time, the thickness of the crystallized glass is set to 40IL or 50μ depending on the track pitch. In thermocompression bonding, the amorphous portion contained in the crystallized glass at a ratio of several percent begins to melt, and the crystals in the crystalline portion are not destroyed, usually at a temperature of about 800°C for about 2 to 5 hours. kg
Adhesion is applied by applying a pressure of about /am2. Then, in a direction perpendicular to the surface of the bonded crystallized glass, each block is approximately 2 mm wide as shown in Figure 3, a-a, bb-b! ! Cut along.

Next, a winding groove A is formed perpendicularly to the bonding surface of the crystallized glass shown in FIG. 4 to form a U-shaped block. At this time, the length of the leg portion of the U-shaped block is machined to be longer than the dimension when the magnetic head is completed. Next, a non-magnetic slider 1 made of calcium titanate and having a thickness of 0.3 m is covered with glass or resin over the winding groove A and adhered to form the mouth-shaped block shown in FIG. Next, the surfaces on which the intermediate nonmagnetic layer, slider, and soft magnetic material are exposed are mirror-polished to form a soft magnetic film that will become the main magnetic pole. A material with a small coercive force Hc is desired, and in the example, a Co--Zr based amorphous soft magnetic thin film 3 was formed by sputtering to a thickness of about 0.3 μm. As shown in Figure 5, this sputtered soft magnetic thin film is etched to form a recording/reproducing track with a track width of 60 μm and a center pitch of 100 μm, so that the gap between the tracks is 40 μm. I do. Next, the block shown in FIG. 4 without sputtered amorphous and the block shown in FIG. 5 with sputtered amorphous are adhered using resin or the like at symmetrical positions so that the intermediate nonmagnetic layers shown in FIG. 6 butt each other. Next, in order to secure a winding groove, the opposite side of the non-magnetic slider 1 of the block formed in the shape of an opening is ground and cut off parallel to the slider surface to form a winding groove A with one side open. A winding groove B is formed in a direction perpendicular to the winding groove A with a width wider than that of the intermediate nonmagnetic layer shown in FIG. 7 so that the intermediate nonmagnetic layer 9 is at the center of the groove.

In this case, it is preferable that the groove has a constricted tip rather than a U-shape. Next, the intermediate non-magnetic material is cut in the middle so that one line and two tracks of main poles are formed in each head, and windings M5a and 5b are applied to each main pole as shown in FIG. Finally, a back core nonmagnetic material 8 such as calcium titanate is attached in between, forming the main magnetic poles 6a and 6b shown in FIG. Ferrite back cores 7a and 7b are bonded to the non-magnetic part 8 and both sides thereof with resin or the like.
By polishing the non-magnetic slider 1a and lb surfaces, which serve as sliding surfaces, into R surfaces or spherical surfaces, a magnetic head for perpendicular magnetic recording of one line and two tracks as shown in FIGS. 1 and 2 of the present invention is completed. do. In this way, in the present invention, the two recording and reproducing tracks are magnetically divided into main magnetic poles by the intermediate nonmagnetic layer that separates the two tracks.

A magnetic head for perpendicular magnetic recording is constructed which has two auxiliary magnetic pole windings and two tracks on one line.

C8 Effects of the Invention [Effects of the Invention] Since the present invention is configured as described above, it has the effects described below.

Now we can provide a magnetic head for perpendicular magnetic recording that can perform 1-line, 2-track recording and reproduction with a single magnetic head, which can be applied to still video floppies, etc., and also enables higher magnetic recording density than conventional longitudinal magnetic recording methods. became.

Further, the magnetic head for perpendicular magnetic recording of the present invention does not require special manufacturing equipment and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a magnetic head for one-line, two-track perpendicular magnetic recording according to the present invention. FIG. 2 is a perspective view showing a cross section of the auxiliary magnetic pole of the magnetic head for L-line two-track perpendicular magnetic recording according to the present invention, with a part removed. 3 to 9 are diagrams showing the manufacturing process of a magnetic head for one-line, two-track perpendicular magnetic recording according to the present invention. A perspective view of the glued blocks. FIG. 4 is a perspective view of a block in which a winding groove A is formed and a nonmagnetic slider is adhered. FIG. 5 is a perspective view of a block on which a magnetic thin film forming a main magnetic pole is formed. FIG. 6 is a perspective view of two blocks glued together with a magnetic thin film serving as the main magnetic pole sandwiched therebetween. FIG. 7 is a perspective view of a block formed by processing winding grooves on the opposite side of the slider surface. FIG. 8 is a perspective view of winding wires applied to the main pole. FIG. 9 is a perspective view of the back core adhered. 1, la, lb...non-magnetic slider, 2...
Ni-Zn or Mn-Zn ferrite, 2a, 2b
, 2c... Auxiliary magnetic pole, 3-Co-Zr amorphous soft magnetic thin film, 3a, 3b... Recording/reproducing track, 4
...adhesive layer, 5a, 5b--winding wire, 6a, 6b
...Main magnetic pole, 7a, 7b... Ferrite back core, 8... Nonmagnetic material of back core, 9... Intermediate nonmagnetic layer, A, B... Winding groove.

Claims (1)

[Scope of Claims] 1. A slider consisting of an auxiliary magnetic pole made of a soft magnetic material, a main magnetic pole made of a soft magnetic thin film, and a non-magnetic ceramic on the front surface of the main pole and auxiliary magnetic pole provided with a recording and reproducing track for recording and reproducing. The main magnetic pole is wound with a wire, and the opposite side of the slider is connected to the main magnetic pole by a back core made of soft magnetic material.
In a main pole-excited perpendicular magnetic recording magnetic head configured by magnetically connecting an auxiliary pole, a nonmagnetic layer is inserted between two recording/reproducing tracks to magnetically separate the two tracks, and the two tracks are separated. Each has a main magnetic pole located in the center and two auxiliary magnetic poles, and the main magnetic pole and auxiliary magnetic pole are magnetically connected by a back core with a non-magnetic material inserted in the middle to magnetically separate each of the two tracks. 1. A magnetic head for perpendicular magnetic recording, characterized in that the two main poles are each wound with a winding wire. 2. The method of manufacturing a magnetic head for perpendicular magnetic recording according to claim 1, which comprises the following steps. b) Soft magnetic material blocks forming the main magnetic pole and auxiliary magnetic pole and non-magnetic crystallized glass corresponding to the track pitch are laminated alternately to form a multilayer, and heated to a temperature where the amorphous portion of the crystallized glass melts. After bonding under pressure, the first step is to cut the crystallized glass along a plane perpendicular to the bonded surface and end surface, respectively. b) Cut a first U-shaped groove at right angles to the crystallized glass surface,
The second step is to glass-fuse a ceramic non-magnetic slider plate to the cut end of the U-shaped groove. C) Share the soft magnetic material block, non-magnetic slider, and crystallized glass, and mirror polish the surface perpendicular to the crystallized glass,
A third step is to sputter a soft magnetic film for the main pole on the mirror-polished surface, and then form two recording/reproducing tracks in a V-shape by etching, with a crystallized glass layer forming an intermediate nonmagnetic layer in between. D) A fourth step in which the block to which the recording and reproducing tracks are attached and the mirror-polished block are bonded with resin at symmetrical positions with the etched surface of the recording and reproducing tracks in step C) sandwiched between them. e) Form a second U-shaped groove in the soft magnetic material block along the crystallized glass surface in a direction perpendicular to the first U-shaped groove in the direction of the adhesive surface of the slider material, and A fifth step of grinding the magnetic material block parallel to the surface of the slider material to expose the first U-shaped groove. f) Form a main magnetic pole by cutting the middle of the bonded surface of the crystallized glass parallel to the surface, and winding each of the two main magnetic poles.
process. g) A seventh step of bonding a soft magnetic material back core with a resin and polishing the non-magnetic slider surface into an R surface or a spherical surface, with a non-magnetic portion of the back core provided in the middle for each track.