JPH0323503A - Flush type magnetic head - Google Patents

Abstract

PURPOSE:To allow the execution of recording and reproducing with good quality by providing magnetic metallic films having a thickness above the butt depth of a gap and a high saturation magnetic flux density over the entire surface of the medium-facing surfaces of core for recording and reproducing. CONSTITUTION:The core 2 for recording and reproducing is adhered and fixed by glass bonding to a part of the rear end, viewed from the medium traveling directions, of a slider 1 consisting of ceramics. The core 2 for recording and reproducing is formed by sputtering 'SENDUST(R)' as the magnetic metallic films 3 having the high saturation magnetic flux density on the medium-facing surfaces 6 of an I-shaped core 2a and a C-shaped core 2b consisting of Mn-Zn ferrite, then polishing the 'SENDUST(R)' films until the thickness thereof attains the butt depth 5 of the gap, then forming the gap. The stable recording and reproducing characteristics are obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to the structure of an embedded magnetic head. [Prior Art J] A conventional embedded magnetic head is commonly called a composite head, and has a recording/reproducing core made of Mn-2n ferrite in a part of the rear end of a slider made of ceramics when viewed from the medium running direction. It is embedded using glass, etc. In recent years, as magnetic recording media have been made to have higher Yasuda forces as a measure to improve B density, it has become desirable to improve the writing ability of magnetic heads. It has been. [Problem to be solved by the invention] i[2
14. The saturation magnetic flux density of the reproducing core is about 5500 Gauss, which has the disadvantage that it cannot record sufficiently on media with a coercive force of 1000 eld or more, and un-Z
The crystal grain size of n-ferrite is 8 to 12 μm, and if the track width is around IOLLa+, only one crystal grain will fit within the track width, resulting in unstable quality. An object of the present invention is to provide an embedded magnetic head that can record on a magnetic recording medium with high durability and that can accommodate a narrow track width. [F-stage 1 for solving the problems The embedded magnetic head of the present invention includes a metal magnetic film with a high saturation magnetic flux density having a thickness at least equal to the gap abutment depth on the entire surface of the recording/reproducing core facing the medium. is provided to form a gap.

[Effect]

A gap is formed by a metal magnetic film with a high saturation magnetic flux density that is thicker than the gap abutting depth on the entire surface of the recording/reproducing core facing the medium, so it is suitable for magnetic recording media with high coercive force. In addition, by processing the track width within the metal magnetic film, high-quality recording and reproduction can be performed even with a narrow track width.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a first embodiment of the embedded magnetic head of the present invention, and FIG. 2 is a partially enlarged perspective view of the recording/reproducing core 2 shown in FIG.

This embedded magnetic head has a slider 1 made of ceramic.
A recording/reproducing core 2 is adhesively fixed to a part of the rear end when viewed from the medium running direction 4 by glass bonding. As shown in FIG. 2, the recording/reproducing core 2 has Sendust as a metal magnetic film 3 with a high saturation magnetic flux density of 5 μm on the medium facing surface 6 of the ■-shaped core 2a and C-shaped core 2b made of Mn-Zn ferrite. After sputtering with a thickness of , a post-polishing gap is formed so that the thickness of the sendust film becomes the gap butt depth 5. The saturation magnetic flux density of Mn-Zn ferrite is 5500 Gauss, but the saturation magnetic flux density of this Sendust film is about to, ooo Gauss, and Mn
The magnetic flux is approximately twice that of n-Zn ferrite, and can generate a magnetic flux sufficient to magnetize a high coercive force medium.

FIG. 3 is a partially enlarged perspective view of the recording/reproducing core of the second embodiment of the embedded magnetic head of the present invention. In the embedded magnetic head shown in FIG. 3, the I-shaped core +2 made of Mn-Zn ferrite constitutes the recording/reproducing core 12.
The metal magnetic li 13 made of sendust provided on the medium facing surfaces of the C-shaped cores 12b and 12b is ground to a depth equal to or greater than the gap butting depth so as to regulate the width in the medium running direction 4, so that a predetermined track width 7 is obtained. It has been obtained.

The embedded magnetic head of the 7g2 example can magnetize a high coercive force medium as in the first example, and a narrow track is obtained in the metal magnetic film made of sendust, and the Mn-Zn ferrite crystal grain size 8~12μ
Since the crystal grain size of sendust is about 200 A with respect to m, the influence of crystal distribution within the track width can be almost ignored even if the track width is less than 10 μtnM.

〔Effect of the invention〕

As explained above, the present invention provides the recording/reproducing core with a metal magnetic film having a high saturation magnetic flux density and a thickness equal to or greater than the gap abutting depth on the medium-facing surface of the recording/reproducing core to form a gap. Since magnetic saturation of the reproducing core does not occur, it is possible to record on a magnetic recording medium with a high coercive force, and if the track width is processed within the metal magnetic film,
Since the crystal grain size of the metal magnetic film is minute, there is an effect that stable recording and reproducing characteristics can be obtained even with a narrow track width.

[Brief explanation of drawings]

1 is a perspective view of a first embodiment of the embedded magnetic head of the present invention, FIG. 2 is a partially enlarged perspective view of the recording/reproducing core 2 of FIG. 1, and FIG. 3 is a perspective view of a first embodiment of the embedded magnetic head of the present invention. FIG. 7 is a partially enlarged perspective view of the recording/reproducing core of the second embodiment of the embedded magnetic head. 1...Slider, 2.12-...Recording/playback core, 2a. I2a
......■-shaped core, 2b, 12b-...C-shaped core, 3.13...Metal magnetic film, 4...Medium running direction, 5... ... Gap butt depth, 6 ... Medium facing surface, 7 ... Track width.

Claims (1)

[Claims] 1. An embedded magnetic head having a structure in which a recording/reproducing core made of a sintered oxide magnetic material is embedded in a part of a slider made of a non-magnetic material, comprising: 1. A recessed magnetic head, characterized in that a metal magnetic film having a high saturation magnetic flux density and having a thickness equal to or greater than the gap abutting depth is provided on the entire surface of the medium-facing surface of the core to form a gap.