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Magnetic recording medium and magnetic storage
| Details |
Inventors: Yahisa, Yotsuo; Shiroishi, Yoshihiro; Hishiyama, Sadao; Ohno, Tomoyuki; Saitoh, Shinichiro; Suzuki Hiroyuki (Kawasaki, JP), Matsuda; Yoshibumi (Kokubunji, JP), Tsumita; Norikazu (Kanagawa, JP), Ohura; Masaki (Odawara, JP), Shige; Noriyuki (Odawara, JP), T
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Thibodeau; Paul J.
Assistant Examiner: Kiliman; Leszek
Attorney, Agent or Firm: Kenyon & Kenyon
A magnetic recording medium that uses, as a protective coating layer provided on a magnetic layer for magnetically recording signals, a layer made of a nonmagnetic material consisting of two ore more elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and one or more elements of N, C, O, and B, or made of a magnetic material consisting of one or more elements of Co, Fe, Ni, and Gd, one or more elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and one or more elements of N, C, O, B, and Si is excellent in sliding endurance. When the protective coating layer is made of the nonmagnetic material, the magnetic recording medium is also excellent in corrosion resistance, and when the protective coating layer is made of the magnetic material, the spacing between a magnetic head and the magnetic recording medium can advantageously be made large. Both the cases are high in reliability, and suitable for high density magnetic recording. The magnetic recording medium can be used in combination with a magnetic head that uses a metal magnetic alloy as at least part of the magnetic core to provide an excellent magnetic storage. |
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DETAILED DESCRIPTION The present invention has been made by taking the above points into account.
The present invention solves the above-described problem, providing a magnetic recording medium excellent in sliding endurance, and corrosion resistance, and suitable for high density recording by forming, on a magnetic thin film, for example, of a metal, an oxide, or a nitride, a nonmagnetic protective coating layer whose adhesion to the magnetic layer is excellent, which is high in hardness, and toughness, and low in frictional coefficient, and to which a liquid lubricant adheres favorably, thus providing a mass magnetic storage high in reliability.
The present invention also provides a medium that excludes the above nonmagnetic protective film, is heightened in recording/reproducing characteristics, and is high in sliding endurance.
In an embodiment of the present invention at least one nonmagnetic protective coating layer made up of at least two elements selected from a first group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and at least one element selected from a second group consisting of N, C, O, and B are provided on a magnetic layer.
It is desirable that the amount of one element selected from the first group is from down to 0.
1 at.
% to up to 99.
9 at.
%, and more desirably from down to 20 at.
% to up to 80 at.
%, assuming the total amount of the elements of the first group to be 100 at.
%.
The total amount of the elements of the first group is from down to 10 at.
% to up to 99 at.
%, assuming the the total amount of the elements of the first group and the elements of the second group to be 100 at.
%.
It is more preferable to make the protective layer up of two or three layers whose materials have different compositions, because that improves the corrosion resistance and the sliding endurance.
It is particularly desirable that said nonmagnetic protective coating layer contains Zr, Nb, Hf, or W of the elements of the first group, and N of the elements of the second group, or contains at least W of the elements of the first group, and C of the elements of the second group
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