JPH01236414A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the traveling property and durability of the magnetic head and to suppress the decrease of the output thereof by using the same material as the material of a slider or using such a material with which the wear resistance of a spacer is between the respective wear resistances of the slider and magnetic ally film as the constituting material of the spacer. CONSTITUTION:At least the same material as the slider forming material is used as the material for forming the spacer 2 to be interposed and disposed between a recording and reproducing head 1 and an erasing head 3 or the material which realizes that the wear resistance is between the wear resistances of the base body of the recording and reproducing head and the magnetic alloy film is used as said material. The progression of wear between the slider 4 and the spacer 2 is, therefore, substantially the same even if the contact sliding surface of the magnetic head is gradually worn by the relative contact sliding with the magnetic recording medium. The generation of a step between both is thereby substantially obviated and the magnetic recording medium is hardly damaged. In addition, recording and reproducing are surely executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and more particularly to a magnetic head configured to minimize the occurrence of steps on the sliding surface of the magnetic head.

[Conventional technology]

In a magnetic head (see FIG. 1 showing the configuration of the present invention) used in a floppy disk drive (FDD), which is one of the commercially available magnetic media, conventionally a recording/reproducing head 1 and an erasing head 3 are used. The core does not require a magnetic alloy film with high saturation magnetic flux density, and is made only of polycrystalline Mn-Zn ferrite 21 (see Figure 2), and the spacer 2 sandwiched between the recording/reproducing head and the erasing head. The material used was crystallized glass 1, and the slider 4 was made of ceramics such as barium titanate (BaTiO3).

In contrast, FDDs have recently achieved higher recording densities.
As such, a device using a metal medium with high coercive force has been proposed.

[Problem to be solved by the invention]

In the above-mentioned high recording density FDD, the recording/reproducing head uses a cobalt-based amorphous alloy film or Fe as a magnetic alloy film.
-3i-Aj! A so-called composite magnetic head having a (Sendust) alloy film is used. However, in the head of a high-density FDD having this configuration, the magnetic alloy film of the recording/reproducing head is inferior in wear resistance compared to the ferrite substrate and the slider material adjacent thereto. For this reason, when sliding with a metal medium for a long time, the magnetic alloy film is gradually removed, the step between the ferrite substrate, slider, etc. becomes large, causing uneven wear, and as a result, the metal medium is damaged.
This is a cause of deterioration not only in the runnability of the metal medium but also in its durability. Furthermore, since the magnetic alloy film is recessed compared to the surrounding area, the spacing between the magnetic alloy film and the metal medium becomes large, and the recording and reproducing characteristics are also degraded.

[Means to solve the problem]

The present invention is configured to solve the above-mentioned technical problem, and improves the material selection of the spacer interposed between the recording/reproducing head and the erasing head, and the spacer forming material is made of at least (1) Use the same material as the slider forming material (2)
The material is characterized in that its wear resistance is between that of the base of the recording/reproducing head and that of the magnetic alloy film.

[Effect]

Even if the contact sliding surface of the magnetic head gradually wears out due to relative sliding contact with the magnetic recording medium, it will not slip.

Since the progress of wear between the holder and the spacer is almost the same, there is almost no difference in level between the two, so there is almost no damage to the magnetic recording medium, and recording and playback can be performed reliably. can.

The present invention will be explained in detail below.

[Embodiment 1] FIG. 1 is an external perspective view of a magnetic head for FDD realizing the configuration of the present invention, and FIG. 3 is an enlarged view of section A in FIG. 1. In Fig. 3, 31 is an Mn-Zn ferrite part, 32 is a magnetic alloy film, 33 is a spacer, 34.35 is a bonding material glass, 36
is a slider.

In the magnetic head with the above configuration, the spacer and slider are made of the same material [for example, both are made of barium titanate (
The surface roughness of the medium sliding surface of this head was examined, and the level difference at each location was measured before and after the metal medium ran. Each reference numeral 41 to 46 in FIG. 4 indicates the measurement site. That is, 41 is the boundary between the ferrite 31 and the magnetic alloy film 32 (measurement point 3), and 42 is the boundary between the spacer 33 and the ferrite 31 (
Reference numeral 43 indicates the boundary between the spacer 33 and the magnetic alloy film 32 (measurement area ■), and 44 indicates the boundary between the slider 36 and the ferrite 31 (measurement area ■).
, 45 is the boundary between the spacer 33 and the slider 36 (measurement area ■), 46 is the magnetic alloy film 32 and the slider 36
This is the boundary area (measurement area ■).

The metal medium used is (Hc (coercive force) -145
0 oersted, Br (residual magnetic flux density) = 1500G (
Gauss)] was used to run the vehicle, and the level differences occurring at each of the above portions were measured. In addition, the main running conditions for the metal medium at this time were a rotation speed of 900 rpm, and a running environment temperature of 20°C.
, the humidity was 60%. The level difference of each part was measured under the above conditions, and the results are shown in Table 1 below.
The hardness of the magnetic alloy (cobalt-based amorphous alloy) used is Hv900, showing the state after 00,000 passes.

Table 1 As is clear from the above table, it was confirmed that even after the running test, the spacer did not become an obstacle to the sliding of the metal medium, as opposed to the convex portion.

In addition, the height difference between the spacer and the magnetic thin film is only 0.06μ, and the spacing with the medium is 1/1 compared to the comparative example described later.
2 or less, it can be seen that there is little deterioration in output.

[Example 2] As a spacer, Mn0-Ni0 based ceramics with hardness Hv=570 [for example, manufactured by Hitachi Metals, product name (HCE
- MNI)) was used as a slider using barium titanate ceramics [Hitachi Metals type, trade name (EB9)] with hardness) (v = 800) and the same running test as in Example 1 was conducted. was measured. The test results are shown in Table 2 below.

Table 2 [Comparative example] Mn with Vickers hardness Hv650 on ferrite substrate
-Zn single crystal [For example, manufactured by Hitachi Metals ■, trade name (H5-
3)) Use ferrite, hardness HV8 for spacer
For the slider, a barium titanate ceramic having a hardness of Hv800 (for example, manufactured by Hitachi Metals ■, trade name (EB9)) was used. Other conditions are the same as in Example 1.

The test results are shown in Table 3 below.

Table 3 In this comparative example, it can be seen that the step on the sliding surface of the magnetic head, which was concave with respect to the slider, became convex after the running test and became a large obstacle. In particular, the difference in level between the spacer and the magnetic alloy film is as much as 0.degree. and 15 .mu.m, which increases the spacing between the spacer and the magnetic alloy film, which may reduce the overall output of the device.

Next, FIG. 5 shows the relationship between the number of times the magnetic recording medium was slid and the output change in Example 1.2 and Comparative Example. In the figure, reference numeral 51 indicates Comparative Example 1, 52 indicates Example 2, and 53 indicates the results of Example 1.

In the comparative example, the output has deteriorated to 80% after 3 million passes compared to before running. On the other hand, the deterioration of each example is very small, and even after 10 million passes, the deterioration is 95%.
or more output is maintained.

〔effect〕

As explained above in the Examples and Comparative Examples, in the present invention,
By using the same material as the slider for the spacer, or by using a material whose wear resistance is between that of the slider and the magnetic alloy film,
Magnetic technology that reduces steps on the sliding surface of the magnetic head caused by sliding contact with the medium and the spacing between the head and the medium, thereby improving running performance and durability, and thus preventing a drop in output. You can get the head.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a magnetic head for a floppy disk drive (FDD), Fig. 2 is an enlarged view of a medium sliding surface of a conventional configuration, and Fig. 3 is an enlarged view of a medium sliding surface showing an embodiment of the present invention. (An enlarged view of part A in Figure 1), Figure 4 is an enlarged view of the medium sliding surface showing the measurement site where the step difference occurs, and Figure 5 is the number of sliding times and output of the magnetic recording medium in each example and comparative example. It is a diagram showing the relationship with the ratio. 1... Recording/playback head 2... Spacer 3...
Erasing head 4...Slider 31...Mn-Zn
Ferrite 32...Magnetic alloy film 33...Spacer 34.3
5... Bonding material 36... Slider 1 [Figure 3 Figure 4

Claims (1)

[Claims] In a magnetic head in which a recording/reproducing head and an erasing head are butted against each other via a spacer material and are bonded to a slider to be integrated, the spacer forming material is the same material as the slider forming material, or the spacer forming material is made of the same material as that of the slider. A magnetic head characterized in that the abrasion resistance of the material is between that of the material forming the recording/reproducing head substrate and that of the material forming the magnetic alloy film. .