JP2562051B2 - Magnetic head for perpendicular magnetic recording and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECT OF THE INVENTION [Industrial field of application] The present invention enables magnetic recording of one frame and two fields used for magnetic recording of still video floppy disks.
The present invention relates to a 1-line 2-track magnetic head for perpendicular magnetic recording and a method for manufacturing the same.

[Conventional technology]

In the conventional magnetic recording, most of them use a longitudinal magnetic recording method in which an N pole and an S pole are oriented in parallel to the magnetic recording surface direction, and a high coercive force magnetic recording medium and a high coercive force are used to increase the recording density. , A magnetic head for recording and reproducing data on and from the magnetic recording medium has been developed, and devices using high-density magnetic recording such as 8 mm video, rotary digital audio tape, and still video floppy are commercialized one after another. In particular, video signal recording devices such as VTRs and still video devices are required to have higher magnetic recording densities, and the required performance is about 50 kFRPI, which is almost the limit in the longitudinal recording system. Also, in still video floppy, in order to record and reproduce the TV screen, 1
Two magnetic heads are required on the line, and currently, a two-track thin film magnetic head using thin film technology is adopted, but there are problems such as strict manufacturing conditions, poor yield, and high cost. is there.

[Problems to be Solved by the Invention]

The present invention enables higher density magnetic recording as compared with the longitudinal recording method for use in a still video floppy disc, etc.
Moreover, it is an object of the present invention to provide a magnetic head for one-line / two-track perpendicular magnetic recording having one track and two tracks in one line, and a manufacturing method thereof.

B. Structure of the Invention [Means for Solving the Problems] The present invention is desired for still video floppy and the like.
It is a magnetic head for perpendicular magnetic recording that can achieve a high magnetic recording density of KFRPI or higher, and also provides a 1-line 2-track magnetic head that can record and reproduce TV screens. Perpendicular magnetic recording in which magnetic layers are arranged to separate magnetic circuits, each track has a main magnetic pole, an auxiliary magnetic pole, and a winding independently, and one magnetic head has one line and two tracks. For magnetic head. The magnetic head for 1-line 2-track perpendicular magnetic recording of the present invention can perform magnetic recording with a high magnetic recording density, and the shape of the main magnetic pole film of the recording / reproducing track uses a thin film technique by photoetching, but in other steps. It is a magnetic head that can be manufactured without using the conventional thin film magnetic head manufacturing technology, and is characterized by being a magnetic head for 1-line 2-track perpendicular magnetic recording that is easy to manufacture. 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, a main magnetic pole having a recording / reproducing track for recording / reproducing, and a slider made of non-magnetic ceramics in front of the auxiliary magnetic pole. In the main magnetic pole excitation type magnetic head for perpendicular magnetic recording, the main magnetic pole and the auxiliary magnetic pole are magnetically connected on the opposite side of the slider by a back core made of a soft magnetic material. A non-magnetic layer is inserted in the middle of the recording / reproducing track to magnetically separate the two tracks, and the two tracks have the main magnetic pole at the center and the two auxiliary magnetic poles are arranged. A one-line structure characterized in that the two main magnetic poles are magnetically connected to each other by a back core having a non-magnetic material that magnetically separates each of the two tracks interposed therebetween, and that two main magnetic poles are respectively provided with windings. 2 tracks magnetic head.

Further, the one line 2 according to claim 1 comprising the following steps.
A method of manufacturing a magnetic head for track perpendicular magnetic recording.

A) Blocks of soft magnetic material forming the main pole and auxiliary pole and non-magnetic crystallized glass corresponding to the track pitch are alternately laminated to form a multilayer, and heated to a temperature at which the amorphous portion of crystallized glass melts. After the pressure bonding, the first step of cutting the crystallized glass along the surfaces perpendicular to the bonding surface and the end surface.

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

C) Sharing the soft magnetic material block, non-magnetic slider, and crystallized glass, and mirror-polishing the surface perpendicular to the crystallized glass,
A third step of sputtering a main pole soft magnetic film on a mirror-polished surface and then forming two recording / reproducing tracks in a V shape by interposing a crystallized glass layer forming an intermediate non-magnetic layer therebetween.

D) The fourth step of resin-bonding the block on which the recording / reproducing track is attached with the etching surface of the recording / reproducing track sandwiched by the step of c) and the block which has been mirror-polished at a symmetrical position to each other.

E) A second U-shaped groove is formed on the soft magnetic material block in the direction perpendicular to the first U-shaped groove along the crystallized glass surface and in the slider material bonding surface direction, and the soft material on the opposite side of the slider material surface is formed. 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 main magnetic pole is formed by cutting the middle of the bonded surface of the crystallized glass parallel to the surface, and winding is applied to each of the two main magnetic poles.
Process.

G) A seventh step in which a soft magnetic material back core having a non-magnetic portion of the back core provided in the middle of each track is resin-bonded and the non-magnetic slider surface is polished to an R surface or a spherical surface.

[Action]

In the magnetic head for 1-line 2-track perpendicular magnetic recording according to the present invention, the intermediate non-magnetic layer between the two tracks is integrally fused with the ferrite forming the main pole by the crystallized glass, and the magnetic recording medium can be written into. The slider to be formed is formed by glass-melting a non-magnetic material of calcium titanate on a soft magnetic block, and the magnetic paths forming two tracks are the main magnetic pole, the auxiliary magnetic poles on both sides of the main magnetic pole, and the two main magnetic poles. Since each magnetic track is composed of a ferrite back core that is magnetically separated by a back core non-magnetic portion that connects the auxiliary magnetic pole, and a non-magnetic layer is inserted in the middle of each track, one magnetic head There are two magnetic circuits.

〔Example〕

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

In FIG. 3, first, in order to form the intermediate non-magnetic layer 9 for forming the two tracks, crystallized glass was used to form Ni-Zn.
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 40 μm to 50 μm according to the track pitch. In thermocompression bonding, the amorphous part contained in crystallized glass at a ratio of several% begins to melt,
In addition, bonding is usually performed at a temperature of about 800 ° C. for 2 to 5 hours at which a pressure of about 2 kg / mm ² is applied so that the crystals in the crystalline portion are not broken. Then, each block was formed in a direction perpendicular to the surface of the adhered crystallized glass to a width of about 2 mm, and each block was taken along the line aa, b-b in FIG.
Cut along the line. Next, a winding groove A is formed in the direction perpendicular to the crystallized glass bonding surface 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 processed to be longer than the dimension when the magnetic head is completed. Next, a non-magnetic slider 1 with a thickness of 0.3 mm of calcium titanate,
Cover the winding groove A with glass or resin and bond it
It is a square block shown in the figure. Next, the intermediate non-magnetic layer,
The surface showing the slider and soft magnetic material is mirror-polished to form the soft magnetic film that will become the main magnetic pole. As the magnetic film for this main magnetic pole, a material with a large saturation magnetic flux density Bs and a small coercive force Hc is desired. Rarely, in the embodiment, the Co—Zr type amorphous soft magnetic thin film 3 was formed by sputtering to a thickness of 0.3 μm. This sputtered soft magnetic thin film has a track width of 60μ as shown in FIG.
m, the center pitch between the tracks is 100 μm, and thus the gap between the tracks is formed by etching the recording / reproducing track to form the main magnetic pole film in a pattern of 40 μm. Next, the amorphous sputtered block shown in FIG. 4 and the amorphous sputtered block shown in FIG. 5 are bonded using a resin or the like at symmetrical positions so that the intermediate nonmagnetic layers shown in FIG. Next, in order to secure the winding groove, the opposite surface of the block formed in a square shape to the non-magnetic slider 1 is ground parallel to the slider surface and cut off to form a winding groove A with one side open. Then, the winding groove B is formed in the direction perpendicular to the winding groove A with a width wider than that of the intermediate non-magnetic layer shown in FIG. 7 so that the intermediate non-magnetic layer 9 becomes the center of the groove. At this time, it is preferable that the shape of the groove is squeezed rather than the U-shape. Next, cutting is performed in the middle of the intermediate non-magnetic material so as to form the main poles of 1 line and 2 tracks in each head, and the windings 5a and 5b are applied to the respective main poles shown in FIG. Finally, a back core non-magnetic material 8 such as calcium titanate is attached in between to form the main magnetic poles 6a and 6b shown in FIG. 9, and the back core is parallel to the intermediate non-magnetic layer of the wound magnetic leg. Non-magnetic part 8 and ferrite back core 7 on both sides
Non-magnetic slider that becomes a sliding surface by bonding a and 7b with resin etc.
By polishing the surfaces 1a and 1b into the R surface or the spherical surface, the magnetic head for perpendicular magnetic recording of one line and two tracks shown in FIGS. 1 and 2 of the present invention is completed. As described above, in the present invention, the two recording / reproducing tracks have the magnetically divided main magnetic pole, auxiliary magnetic pole, and winding by the intermediate non-magnetic layer that divides the two tracks, and two tracks are formed on one line. A magnetic head for perpendicular magnetic recording is provided.

C. EFFECTS OF THE INVENTION [Advantages of the Invention] Since the present invention is configured as described above, it has the effects described below.

To provide a magnetic head for perpendicular magnetic recording which can be applied to still video floppy and the like and can perform recording / reproduction of one line and two tracks with one magnetic head and which can achieve a higher magnetic recording density than the conventional longitudinal magnetic recording system. became.

Further, the magnetic head for perpendicular magnetic recording of the present invention can be manufactured inexpensively without requiring a special manufacturing apparatus.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head for 1-line 2-track perpendicular magnetic recording according to the present invention. FIG. 2 is a perspective view showing a cross section of the magnetic head for 1-line 2-track perpendicular magnetic recording according to the present invention, excluding a part of an auxiliary magnetic pole. 3 to 9 are views showing a manufacturing process of a magnetic head for 1-line 2-track perpendicular magnetic recording according to the present invention, and FIG. 3 shows an intermediate non-magnetic layer made of crystallized glass and ferrite alternately. The perspective view of the adhered block. FIG. 4 is a perspective view of a block in which a winding groove A is formed and a non-magnetic slider is bonded. FIG. 5 is a perspective view of a block in which a magnetic thin film that serves as a main pole is formed. FIG. 6 is a perspective view of a block in which two blocks are bonded together with a magnetic thin film serving as a main pole sandwiched therebetween. FIG. 7 is a perspective view of a block formed by processing a winding groove on the side opposite to the slider surface. FIG. 8 is a perspective view in which a winding is applied to the main pole. FIG. 9 is a perspective view in which a back core is adhered. 1,1a, 1b …… Non-magnetic slider, 2 …… Ni-Zn or Mn
-Zn ferrite, 2a, 2b, 2c ... auxiliary pole, 3 ... Co-Zr
Amorphous soft magnetic thin film, 3a, 3b ... Recording / reproducing track, 4 ... Adhesive layer, 5a, 5b ... Winding, 6a, 6b ... Main pole,
7a, 7b ... ferrite back core, 8 ... back core non-magnetic material, 9 ... intermediate non-magnetic layer, A, B ... winding groove.

Claims (2)

(57) [Claims] 1. An auxiliary magnetic pole made of a soft magnetic material, a main magnetic pole made of a soft magnetic thin film, a main magnetic pole having a recording / reproducing track for recording / reproducing and a slider made of non-magnetic ceramics in front of the auxiliary magnetic pole. And then winding the main pole,
On the opposite side of the slider, a back core made of soft magnetic material
In a magnetic pole for main magnetic pole excitation type perpendicular magnetic recording, which is constructed by magnetically connecting a main magnetic pole and an auxiliary magnetic pole, a non-magnetic layer is inserted between two recording and reproducing tracks to magnetically separate the two tracks. Each of the two tracks has a main magnetic pole at the center, and two auxiliary magnetic poles are arranged. The main magnetic pole and the auxiliary magnetic pole are magnetically separated by a back core in which a non-magnetic material for magnetically separating the two tracks is inserted. Magnetic head for perpendicular magnetic recording, which is connected to each other and is configured by winding two main magnetic poles. 2. A method of manufacturing a magnetic head for perpendicular magnetic recording according to claim 1, comprising the following steps. A) Blocks of soft magnetic material forming the main pole and auxiliary pole and non-magnetic crystallized glass corresponding to the track pitch are alternately laminated to form a multilayer, and heated to a temperature at which the amorphous portion of crystallized glass melts. After the pressure bonding, the first step of cutting the crystallized glass along the surfaces perpendicular to the bonding surface and the end surface. B) Cut the first U-shaped groove at a right angle to the crystallized glass surface,
The second step of glass-bonding a ceramic non-magnetic slider plate to the cut end of the U-shaped groove. C) Sharing the soft magnetic material block, non-magnetic slider, and crystallized glass, and mirror-polishing the surface perpendicular to the crystallized glass,
A third step of sputtering a main pole soft magnetic film on a mirror-polished surface and then forming two recording / reproducing tracks in a V shape by interposing a crystallized glass layer forming an intermediate non-magnetic layer therebetween. D) The fourth step of resin-bonding the block on which the recording / reproducing track is attached with the etching surface of the recording / reproducing track sandwiched by the step of c) and the block which has been mirror-polished at a symmetrical position to each other. E) A second U-shaped groove is formed on the soft magnetic material block in the direction perpendicular to the first U-shaped groove along the crystallized glass surface and in the slider material bonding surface direction, and the soft material on the opposite side of the slider material surface is formed. 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 main magnetic pole is formed by cutting the middle of the bonded surface of the crystallized glass parallel to the surface, and winding is applied to each of the two main magnetic poles.
Process. G) A seventh step in which a soft magnetic material back core having a non-magnetic portion of the back core provided in the middle of each track is resin-bonded and the non-magnetic slider surface is polished to an R surface or a spherical surface.