JPS60154315A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the recording and reproducing characteristic at a low temperature by forming a gap spacer with a superconductor. CONSTITUTION:The gap spacer 5 is formed by using the superconductor between head halves 2 and 3 and thin film 51 made of superconductor is applies also to a wall face 41 of the tape side of a winding slot 4. When the superconductor constituting the gap spacer 5 reaches the state below the critical temperature and critical magnetic field, the electric resistance goes to 0, a permanent current is produced and the conductor becomes a perfect antimagnetic substance. Thus, no magnetic flux invades into the superconductor at all. The leaked magnetic flux near the gap is leaked to the tape, a strong magnetic flux density is produced and the recording efficiency is improved. Since the spacer 5 does not pass the magnetic flux when magnetic flux 7 is generated from the tape 6 at reproduction, the opposite side to the running face of the head 1, that is, the back core part receives the magnetic flux 7 so as to improve the reproducing efficiency.

Description

[Detailed description of the invention] The present invention relates to a magnetic head with improved recording and reproducing efficiency.

[Prior art]

As shown in Fig. 8, the magnetic head of a conventional V, T, R, magnetic recording and reproducing device has a pair of magnetic heads made of single-crystal or polycrystalline Mn-Zn ferrite with a gap spacer (between 21+3+). (5) 5to2 or high melting point glass is interposed.

Mn-Zn ferrite exhibits excellent high frequency characteristics, and
Because its hardness is higher than that of metallic magnetic materials, it is an excellent material for V, T, and H heads, where the recording wavelength is extremely short and the head and tape run in contact at relatively high speeds. It is.

However, when considering Mn-Zn ferrite microscopically from the point of view of saturation magnetic flux density, which is a decisive factor during recording,
Mn-Zn ferrite is ferrimagnetic with a different arrangement of magnetic moments from ferromagnetic metallic materials, which are pure ferromagnetism, so it has a lower saturation magnetic flux density (and poorer recording characteristics) than metallic magnetic materials. There are drawbacks.

In addition, since the SiO2 or glass that is the gap spacer (5) is not completely diamagnetic, magnetic flux flows not only to the back core of the head but also to the front core through the gap spacer, resulting in a problem of degraded playback efficiency. There is.

[Object of the present invention]

An object of the present invention is to improve the recording and reproducing characteristics by modifying the material of the gap spacer.

[Configuration of the present invention]

A gap spacer (5) between the pair of magnetic head halves (21+3+) is made of superconductor.

[Actions and effects of the present invention]

A superconductor becomes completely diamagnetic when the temperature is below the critical temperature, so when a gap spacer made of a superconductor is cooled below the critical temperature, the gap spacer does not pass magnetic flux.

Therefore, during recording on a magnetic recording medium, all leakage magnetic flux (7) generated near the gap as shown in FIG. 2 leaks to the tape side, resulting in a strong magnetic flux density and improved recording efficiency.

During playback, the magnetic flux (7) is transferred from the tape (6) as shown in Figure 3.
When this occurs, the gap section does not pass the magnetic flux, so a large amount of magnetic flux (7) flows to the back core section, and the reproduction characteristics are greatly improved.

The present invention will be specifically described below based on embodiments shown in the drawings.

Fig. 1 shows a magnetic head (1) of the present invention, in which a pair of head halves (+21 +3) are joined with glass (8), and one head halves (2) has a winding groove (4). has been done.

A feature of the head of the present invention is that a gap spacer (5) made of superconductor is formed between the head half-rest +2) (3).

In the embodiment, a superconductor thin film (51) is also applied to the tape-side wall surface (41) of the winding a (4).

The above magnetic head (1) is manufactured by the following steps.

As shown in FIG. 4, the gap abutting surface (22) of the rectangular ferrite block 01) is polished to a mirror finish, and a track width regulating groove (23) and a winding groove (41) are formed as shown in FIG.

As shown in Figure 6, the gap abutting surface (22) and the winding groove (4)
A superconductor thin film (51) is applied to the wall surface of the groove wall in 1) on the side facing the tape by mask evaporation or mask sputtering in a manner corresponding to the desired gap length.

After that, as shown in FIG. 7, the other block (31) having the track width regulating groove (32) is attached to the block (21) having the winding groove (4) with the track width regulating groove (23) (
32) are aligned and facing each other, and 1 molten glass is poured into the gap between the grooves (23) (32) and both bridges +21) (31) to join both blocks (211+31).

2. The surface (20) of the block that will be the tape contact surface is
- Polish the curved surface as shown by the chain line, and then slime the block to form a head.

As is well known, when the superconductor constituting the gap spacer (5) reaches a critical temperature and a critical magnetic field, the electrical resistance suddenly becomes zero, a persistent current is generated, and the superconductor becomes completely diamagnetic due to the Meissner effect. Therefore, magnetic flux does not penetrate into the superconductor at all, and if magnetic flux has previously passed through the superconductor, the magnetic flux will be pushed out as soon as the superconductor enters the superconducting state.

For the above reasons, when the head is used under conditions below the critical temperature of the superconductor, the gap spacer (5) made of the superconductor does not pass magnetic flux.

During recording, the leakage magnetic flux (7) generated near the gear knob as shown in Figure 2 completely leaks to the tape side because the gap spacer (5) does not allow the magnetic flux to pass through, resulting in a strong magnetic flux density and recording. Increased efficiency.

During playback, as shown in Figure 3, when magnetic flux is generated from the tape, the gap spacer (5) does not allow the magnetic flux (7) to pass through, so a large amount of magnetic flux is transferred to the opposite side of the tape running surface of the head (1), that is, to the back core part. (7) flows and the regeneration efficiency is greatly improved.

Superconductors include type 1 superconductors and type 2 superconductors, but type 2 superconductors often have higher critical temperatures and hardness than type 1 superconductors. Therefore, in implementing the present invention, the second
Species superconductors, e.g. Nb-Zr, Nb-Ti
, Nb3Sn is preferably used.

[Brief explanation of drawings]

Figure 1 is an oblique view of the head, Figure 2 is an explanatory diagram showing the flow of magnetic flux during recording, Figure 3 is an explanatory diagram showing the flow of magnetic flux during reproduction, and Figures 4 to 7 are manufacturing of the head. FIG. 8, which is an explanatory diagram of the process, is a front view of a conventional head. (1)...Head (2)...Head half-off (3)・
・Head half-off (4) ・Winding groove (5) ・Gap spacer

Claims (1)

[Claims] (2) In a magnetic head in which a pair of magnetic heads (21 (31) are connected via a gap spacer (5), the gap spacer (5) is made of a superconductor.