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US 2013/0250453 A1Published application
Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus
AssigneeKabushiki Kaisha Toshiba
InventorTakeshi IWASAKI
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Abstract
According to one embodiment, a perpendicular magnetic recording medium including a soft magnetic under layer, a nonmagnetic seed layer consisting of AgGe, a nonmagnetic interlayer made of Ru or an Ru alloy, and a perpendicular magnetic recording layer, laminated on the nonmagnetic substrate is provided. The nonmagnetic seed layer is an layer containing Ag grains having an fcc structure and an amorphous Ge grain boundary, and the Ag grain surface is higher than the Ge grain boundary surface.
Claims14
A perpendicular magnetic recording medium comprising:
- a nonmagnetic substrate,
- a soft magnetic under layer on the nonmagnetic substrate,
- a nonmagnetic seed layer on the soft magnetic under layer, the nonmagnetic seed layer comprising a silver germanium layer containing silver grains having an fcc structure and an amorphous germanium grain boundary formed around the silver grains, a surface of the silver grain being higher than a surface of the germanium grain boundary,
- a nonmagnetic interlayer on the nonmagnetic seed layer, the nonmagnetic interlayer comprising ruthenium or a ruthenium alloy, and
- a perpendicular magnetic recording layer on the nonmagnetic interlayer, the perpendicular magnetic recording layer comprising cobalt, or iron and platinum.
2 more elements
A magnetic recording/reproduction apparatus comprising:
- a perpendicular magnetic recording medium including a nonmagnetic substrate,
- a soft magnetic under layer on the nonmagnetic substrate,
- a nonmagnetic seed layer on the soft magnetic under layer, the nonmagnetic seed layer comprising a silver germanium layer containing silver grains having an fcc structure and an amorphous germanium grain boundary formed around the silver grains, a surface of the silver grain being higher than a surface of the germanium grain boundary,
- a nonmagnetic interlayer on the nonmagnetic seed layer, the nonmagnetic interlayer comprising ruthenium or a ruthenium alloy,
- a perpendicular magnetic recording layer on the nonmagnetic interlayer, the perpendicular magnetic recording layer comprising cobalt or iron and platinum,
- a mechanism configured to support and rotate the perpendicular magnetic recording medium,
- a magnetic head comprising an element configured to record information on the perpendicular magnetic recording medium and an element configured to reproduce recorded information, and
- a carriage assembly supporting the magnetic head such that the magnetic head can freely move with respect to the perpendicular magnetic recording medium.
5 more elements
Dependencies are inferred from the claim text.