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US 6,551,728 B1Granted
Magnetic recording medium and magnetic storage apparatus
AssigneeFujitsu Limited
InventorsB. Ramamurthy Acharya, Iwao Okamoto
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium is constructed to include a non-magnetic underlayer, and a magnetic layer including a compensation layer provided on the nonmagnetic underlayer, and a recording layer provided on the compensation layer, where the compensation layer has a thickness of 3 to 15 nm and is made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C., and the recording layer has a thickness of 10 to 30 nm and is made of a Co alloy with a Curie temperature of approximately 250 to 800° C.
Claims17
A magnetic recording medium comprising:
- a non-magnetic underlayer;
- and
- a magnetic layer including a compensation layer provided on said non-magnetic underlayer, and a recording layer provided on said compensation layer,
- said compensation layer having a thickness of 3 to 15 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C.,
- said recording layer having a thickness of 10 to 30 nm, and being made of a Co alloy with a Curie temperature of approximately 250 to 800° C.
2 more elements
A magnetic recording medium comprising:
- a non-magnetic underlayer;
- and
- a magnetic layer including a compensation layer provided on said non-magnetic underlayer, and a recording layer provided on said compensation layer,
- said compensation layer having a thickness of 3 to 15 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C.,
- said recording layer having a thickness of 10 to 30 nm, and being made of a Co alloy with a Curie temperature of approximately 250 to 800° C.,
- wherein a total magnetization of said magnetic layer as a whole decreases by approximately 10 to 25% over a temperature range of 0 to 100° C.
3 more elements
A magnetic recording medium comprising:
- a non-magnetic underlayer;
- and
- a magnetic layer including a first compensation layer provided on said non-magnetic underlayer, a second compensation layer provided on said first compensation layer, and a recording layer provided on said second compensation layer,
- said first compensation layer having a thickness of 1 to 5 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 0 to 50° C.,
- said second compensation layer having a thickness of 3 to 15 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C.,
- said recording layer having a thickness of 10 to 30 nm, and being made of a Co alloy with a Curie temperature of approximately 250 to 800° C.
3 more elements
A magnetic storage apparatus comprising:
- at least one magnetic recording medium having at least a non-magnetic underlayer, and a magnetic layer which includes a compensation layer provided on said non-magnetic underlayer and a recording layer provided on said compensation layer,
- said compensation layer having a thickness of 3 to 15 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C.,
- said recording layer having a thickness of 10 to 30 nm, and being made of a Co alloy with a Curie temperature of approximately 250 to 800° C.
A magnetic storage apparatus comprising:
- at least one magnetic recording medium having at least a non-magnetic underlayer, and a magnetic layer which includes a first compensation layer provided on said non-magnetic underlayer, a second compensation layer provided on said first compensation layer, and a recording layer provided on said second compensation layer,
- said first compensation layer having a thickness of 1 to 5 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 0 to 50° C.,
- said second compensation layer having a thickness of 3 to 15 nm, and being made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C.,
- said recording layer having a thickness of 10 to 30 nm, and being made of a Co alloy with a Curie temperature of approximately 250 to 800° C.
1 more element
A magnetic recording medium comprising:
- a non-magnetic underlayer;
- and
- a magnetic layer including a compensation layer provided on said non-magnetic underlayer, and a recording layer provided on said compensation layer,
- said compensation layer being made of Co or a Co alloy with a Curie temperature of approximately 30 to 150° C.,
- said recording layer being made of a Co alloy with a Curie temperature of approximately 250 to 800° C.
2 more elements
Dependencies are inferred from the claim text.