JPS58133627A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To provide a recording medium which is hardly flawed and has high reliability by forming a thin film of boron nitride which is oriented perpendicularly to the surface of a thin film magnetic recording medium of cobalt chromium. CONSTITUTION:A ''Permalloy '' film 2 and a cobalt chromium alloy film 3 are the same as the films of the basic structure in the prior art and further, a thin film 9 of boron nitride BN is formed as an abrasion-resistant lubricating layer thereon. According as the thickness of the boron nitride BN9 is increased, reliability is improved, but the output of the reproduced signal decreases. The thickness at which troubles such as increased noises arise is determined by taking the characteristics of the perpendicularly magnetized recording film 2 and heads into consideration. The crystalline structure of the boron nitride BN is the hcp structure which is exactly the same as the structure of the thin film of cobalt chromium; besides, the shortest distances among the atoms of the axis (a) of both are virtually equal. Thus, it is possible to grow the thin film of boron nitride epitaxially on the film of cobalt chromium. In other words, the thin film of boron nitride is oriented perpendicularly to the surface of the thin film of cobalt chromium. Lubricity and abrasion resistance are thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention forms a thin film of cobalt, argonium, and boron oriented perpendicularly to the surface of a recording medium. Regarding glossy recording media.

In recent years VT! With the development of computer technology and the growth of computers, the high-density development of magnetic recording tapes and magnetic recording disks is rapidly expanding. The vertical foundation f is used for the P-recording hojo, and the i body is as shown in Fig. A cobalt chromium alloy p5 containing 20 atoms of chromium is formed on top of the coconut to a thickness of about 500X. It has the characteristic of being easily perpendicular to the substrate 1. For recording and reproducing on this new recording medium, a magnetic head of a young design is used, as shown in Figure 2. A permalloy film with a tanzak pattern called the main S pole 5 is formed on the top of the cobalt chromium alloy recording medium 40, and on the opposite side there is a supporting base pole 6.
A magnetic pole made of a rod-shaped ferrite with a coil wound around it is arranged f11. A magnetic head having this structure performs recording and reproduction on a cobalt chromium alloy body.

The crystal structure of the cobalt chromium alloy is a 60,000-dimensional structure, and when a thin film is sputtered by sputtering under an argon pressure of α01 degrees, it stands perpendicular to the base 1# plane. It becomes a columnar structure and vertical-gas anisotropy occurs.The situation is shown in Fig. 5.The columnar microcrystal 7, which is long in the C-axis direction, stands at 111185.This C-axis is i.
The further along the vertical direction of v, the higher the anisotropy at once (the first record is easy to use and the playback output is also high.The deviation from this vertical direction is
f! can be measured by the same line as f! It is called a rocking curve and has a characteristic of Δθ50, as shown in Figure 4.
The #notondo of the world is #3' from the vertical direction of the C axis.
This means that the fI is within 591. Normally, it is sputtered onto an FFT board or an aluminum plate.
In the case of cobalt chromium alloy thin film, ket, 050ke3
Normally, a permalloy thin film is formed under the cobalt-tarromium alloy thin film to enable high-density 111" arrangement, resulting in low noise and high I'm actually outputting the playback output, so it's normal - for example, I'm
A thin film of permalloy and a cobalt-aluminum alloy of approximately 5,000 angstroms each was formed on a flexible base of the eT group. The metal surface is left exposed. - Because of this structure, it exhibits a phenomenon that is completely different from the surface of a magnetic alignment body using conventional rl/mol tubes. - In particular, the surface is When the f# Takao head is scratched, it is more easily scratched than conventional magnetic distribution media, and there are concerns about long-term reliability.The present invention eliminates this drawback and provides a highly reliable dense 1s arrangement. lt
The object of the present invention is to provide a highly reliable magnetic recording medium.Another object of the present invention is to provide a magnetic recording medium with high recording density. The present invention will be explained with reference to the figures below. Figure 5 is a diagram explaining the basics of the present invention. On top of 1 x 1, there is a permalloy l12 which is a small coercive force magnetic film and a vertical [AF vinyl film] The basic structure 2 is the same as that of the conventional structure 2, in which a cobalt-tharium alloy 3 is formed.
9? By forming a thin film of nitrogen and boron BN with a thickness of 1000 angstroms and fν, it is possible to achieve a reliability of 1,000,000 passes on the same material! I
The I property can be maintained even in the case of 11 diodes such as aluminum, and in the case of flexible materials such as PET and boron imide. Effective t-note * On both sides of the body, the main magnetic pole 5 and the safety pole Wt pole 6 are sliders 10 made of Chitaba II Misaki material.
1 stitch is fixed and has a structure that makes the friction with the value smooth ・Nitrogen f biporon BN9 has a thicker grip 11 Reliability is improved, but it becomes too sharp and perpendicular - the distance between the f1 recording film 2 and the tip of the main magnetic pole 5 becomes longer,
Takao Funada force is small or there is a lot of noise -%
9f because a pull occurs? 'Is the thickness of boron BN vertically fractured f? The characteristics of the recording i12 and the head are determined by groove layering.
In Fig. 5, the basic type of the head is shown in which the main magnetic pole 5 and the auxiliary magnetic pole 6 are opposed to each other, but the basic type of the present invention has been improved and the same effect can be obtained for the *5ieIl head and the II song type head. Needless to say, there is a lot to show for it.

The crystal structure of dimpled boron BN is exactly the same as that of large cobalt chromium ** shown in Figs. 5 and 4 above.
It has an ap structure, and the shortest interatomic distance on the a-axis is 2-52 angstroms for the cobalt-thallium alloy SS, while the shortest interatomic distance for the nitride-f-bilon BN thin film is 2.5 angstroms. Vigorous, therefore 1 [
By controlling the conditions for the formation of Hypolon aS, it is possible to grow epitaxially on a cobalt chromium laminate film. That is, a nitride f-biboron thin film can be epitaxially grown on a cobalt chromium laminate thin film I! Orient perpendicular to the plane. Δθ50 at that time
is the same value as that of cobalt chromium**. By using such an oriented Nitrogen/Boron BN@ film f type, the lubricity and wear resistance are improved, and the lubricity and wear resistance are twice as high as those without orientation. The above gM axis property can be ensured, and the coefficient of dynamic friction on the large surface becomes less than α1.
Although it is performed by magnetron sputtering, the orientation C)
Good films were obtained by magnetron sputtering.

1['*# In the body, the effect of the present invention is not the same even when the material is a permalloy film, and the same is true even when there is no thin film of permalloy≠. About the development - Sai-ichi 11 Permalloy film 50D on 50 micron thick PIC base material
O/Gestrom, cobalt chromium alloy film 500
0 angstrom? After engraving, a permanent foundation stone was placed under the boron target, and 500 angstroms of nitrogen fP boron thin film was formed by large magnetron sputtering at an argon partial pressure of 5 x 10''1470 r r % and a nitrogen partial pressure of 2 x 10 Torr.

The Δθ50 of nitrogen (V-boron) was 5 degrees. When a head was vapor-deposited using this record, the signal output normally decreased after about 100,000 passes, but no decrease in signal output was observed even after 3 million passes.・

[Brief explanation of drawings]

Figure 1 is a diagram showing a conventional vertical ζ-IP recording medium. Figure 2 is a diagram explaining a magnetic head having a main pole and an auxiliary S pole. Crystal structure of alloy thin film t11$2 A is a V 0 Figure 4 is a diagram to explain the rocking curve. Figure 5 is a diagram to explain the present invention. 1...1 2 ...Permalloy film 3...Perpendicular magnetic Ibi film 4...Magnetic recording medium 5...Main S pole 6...Auxiliary pole 7...Cylindrical microcrystal 8...1 Pole 9... ...Nitrogen f? Borot 10...slider or more Qi II ¥1 1J2ω 3rd field'IJ+ω'III;ω

Claims (2)

[Claims] (1) Thin layer P mainly composed of an alloy of cobalt and chromium
A one-shot needle arrangement medium characterized by forming a thin film of boron nitride on the surface of a thin film of I-cobalt arthromium in the recording body. (2) Formation of poron nitride thin film 4. 1. A magnetic F recording medium mounted on an IC as claimed in claim 1, wherein the O-axis direction of the magnetic recording medium is oriented perpendicularly to the surface of the cobalt-tarromium alloy layer.