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US 6,686,069 B1Granted
Magnetic recording medium with improved control layer
AssigneeFujitsu Limited
InventorsChiaki Okuyama, Naoya Saitoh, Akira Kikuchi
Life of this patent
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Abstract
A magnetic recording medium includes a non-magnetic substrate, a first non-magnetic control layer disposed above the substrate, a soft magnetic layer disposed above the first control layer, and a second non-magnetic control layer disposed above the soft magnetic layer. A primary magnetic layer is disposed above the second control layer.
Claims25
A magnetic recording medium, comprising:
- a non-magnetic substrate;
- a first non-magnetic control layer disposed above said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer,
- wherein said substrate is texture treated with NiP plating in the circumferential direction of said substrate.
6 more elements
A magnetic recording medium, comprising:
- a non-magnetic substrate;
- a first non-magnetic control layer disposed above said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer,
- wherein said first control layer and said second control layer include at least chromium.
6 more elements
A magnetic recording medium, comprising:
- a non-magnetic substrate;
- a first non-magnetic control layer disposed above, said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer,
- wherein said first and said second control layers include one of NiAl, AlCo, FeAl, FeTi, CoFe, CoHf, CoZr, NiTi, CuBe, CuZn, AlMn, AlRe, AgMg and Al2FeMn2.
6 more elements
A magnetic recording medium, comprising:
- a non-magnetic substrate;
- a first non-magnetic control layer disposed above said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer,
- wherein said soft magnetic layer includes one of FeAlSi and CoTaZr.
6 more elements
A magnetic disk drive apparatus, comprising:
- at least one magnetic recording medium, including:
- a non-magnetic substrate wherein said substrate is texture treated with NiP plating in the circumferential direction of said substrate;
- a first non-magnetic control layer disposed above said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer;
- at least one magnetic head corresponding to Said at least one magnetic recording medium for reading data from and writing data to said magnetic recording medium;
- and
- an actuator having at least one arm corresponding to said at least one magnetic head for supporting and moving said magnetic head above said magnetic recording medium.
9 more elements
A magnetic disk drive apparatus, comprising:
- at least one magnetic recording medium, including:
- a non-magnetic substrate;
- a first non-magnetic control layer disposes above said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer and further wherein said first control layer and said second control layer include at least chromium;
- at least one magnetic head corresponding to said at least one magnetic recording medium for reading data from and writing data to said magnetic recording medium;
- and
- an actuator having at least one arm corresponding to said at least one magnetic head for supporting and moving said magnetic head above said magnetic recording medium.
9 more elements
A magnetic disk drive apparatus, comprising:
- at least one magnetic recording medium, including:
- a non-magnetic substrate;
- a first non-magnetic control layer disposed above said substrate;
- a soft magnetic layer disposed above said first control layer;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer, and further wherein said first and said second control layers include one of NiAl, AlCo, FeAl, FeTi, CoFe CoHf, CoZr, NiTi, CuBe, CuZn, AlMn, AlRe, AgMg and Al2FeMn2;
- at least one magnetic head corresponding to said at least one magnetic recording medium for reading data from and writing data to said magnetic recording medium;
- and
- an actuator having at least one arm corresponding to said at least one magnetic head for supporting and moving said magnetic head above said magnetic recording medium.
9 more elements
A magnetic disk drive apparatus, comprising:
- at least one magnetic recording medium, including:
- a non-magnetic substrate;
- a first non-magnetic control layer disposed above said substrate;
- a soft magnetic layer disposed above said First control layer, wherein said soft magnetic layer includes one of FeAlSi and CoTaZr;
- a second non-magnetic control layer disposed above said soft magnetic layer;
- a primary magnetic layer disposed above said second control layer;
- and
- a protective layer disposed above said primary magnetic layer;
- wherein said first control layer increases (100) plane orientation of said second control layer and said second control layer increases an in-plane orientation of said primary magnetic layer;
- at least one magnetic head corresponding to said at least one magnetic recording medium for reading data from and writing data to said magnetic recording medium;
- and
- an actuator having at least one arm corresponding to said at least one magnetic head for supporting and moving said magnetic head above said magnetic recording medium.
9 more elements
Dependencies are inferred from the claim text.