The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2004
Filed:
Mar. 10, 2000
Tomoo Yamamoto, Hachioji, JP;
Akira Ishikawa, Kokubunji, JP;
Kazusuke Yamanaka, Shiroyama, JP;
Atsushi Nakamura, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
To obtain a large capacity magnetic recording medium capable of recording at a super high density of 3 Gbit or more per one square inch and a magnetic storage apparatus, a magnetic recording medium is prepared by disposing orientation control layers ′ having at least a B2 (CsCl) structure on a substrate , disposing a first underlayer comprising Cr and a second underlayer containing at least one element selected from Cr, Nb, Mo, Ta, W and Ti and having a lattice constant greater than that of the first underlayer and then forming a magnetic layer comprising Co as the main ingredient. A magnetic storage apparatus is constituted by combining the magnetic recording medium, a magnetic head comprising a recording system and a read out system opposed to each of the surfaces of the magnetic recording medium, a unit for moving the magnetic head relative to the magnetic recording medium and a read/write signal processing system for waveform processing of input signals and output signals to and from the magnetic head.