Title:
【発明の名称】磁気記録媒体
Document Type and Number:
Japanese Patent JP2003529174
Kind Code:
A
Abstract:
A magnetic recording disk has a magnetic recording layer formed on a special multilayered "host" layer. The host layer is a "synthetic antiferromagnetically", i.e., at least two ferromagnetic films that are exchange-coupled antiferromagnetically (AF) to one another across a nonferromagnetic spacer film so that their magnetic moments are oriented antiparallel. The magnetic recording layer has a different composition from the top ferromagnetic film in the host layer and is ferromagnetically coupled to the top ferromagnetic film of the host layer. The magnetic volume V of the composite structure (magnetic recording layer and host layer) that determines the thermal stability will be approximately the sum of the volumes of the grains in the magnetic recording layer and the AF-coupled ferromagnetic films of the host layer. However, the magnetic moment of the composite structure is primarily just the moment from the magnetic recording layer because the host layer is designed to have essentially no net magnetic moment.
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Inventors:
Fullerton, Eric, Edward
Margreth, David, Thomas
Marinero, Ernest, Esteban
Chaves, Manfred, Ernst
Margreth, David, Thomas
Marinero, Ernest, Esteban
Chaves, Manfred, Ernst
Application Number:
JP2001571399A
Publication Date:
September 30, 2003
Filing Date:
March 19, 2001
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G11B5/738; G11B5/66; G11B5/72; G11B5/82; H01F10/16; (IPC1-7): G11B5/738; G11B5/72; G11B5/82; H01F10/16
Attorney, Agent or Firm:
Hiroshi Sakaguchi (2 outside)