G - Physics – 11 – B
Patent
G - Physics
11
B
352/31, 117/24.3
G11B 5/64 (2006.01) G11B 5/85 (2006.01)
Patent
CA 1235808
VERTICAL MAGNETIC RECORDING MEDIUM AND PROCESS FOR PREPARATION THEREOF ABSTRACT OF THE DISCLOSURE A vertical magnetic recording medium comprising a substrate and a magnetic layer formed on the substrate and having a magnetic anisotropy in the direction vertical to the surface of the substrate is described. The magnetic layer is composed substantially of a metal selected from cobalt and/or iron, and an oxide of the metal. The metal and metal oxide consist of columnar structures oriented in the direction vertical to the surface of the substrate and spaced from one another through fine voids throughout the magnetic layer. The columnar structures have a diameter of 100 to 1000 .ANG. and the magnetic layer have a void ratio of to 56%. The vertical magnetic recording medium is prepared by a process for vacuum-depositing a metal selected from cobalt and iron to form a magnetic layer on a substrate, wherein an oxygen gas and at least one gas chemically inactive in the vacuum deposition system, which is selected from nitrogen, argon, helium, neon, xenon, radon, methane and ethane, are introduced into the vacuum to an extent such that the pressure in the vicinity of the substrate is 1 x 10-3 to 5 x 10-2 Torr.
476830
Akamatsu Takayoshi
Hayashi Kenji
Horiuchi Satoshi
Oka Tetsuo
Mcfadden Fincham
Toray Industries Inc.
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