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US 6,670,057 B2Granted
Magnetic recording medium and magnetic storage apparatus
AssigneeFujitsu Limited
InventorAkihiro Inomata
Life of this patent
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Abstract
A magnetic recording medium includes a first magnetic layer, a second magnetic layer, and a non-magnetic coupling layer provided between the first and second magnetic layers so that the first and second magnetic layers are exchange-coupled and the magnetizations of the first and second magnetic layers are antiparallel. The first magnetic layer has an exchange coupling field Hex1 which is larger than the respective coercivities Hc1 and Hc2 of the first and second magnetic layers.
Claims17
A magnetic recording medium comprising:
- a first magnetic layer having a coercivity Hc1;
- a second magnetic layer having a coercivity Hc2;
- and
- a non-magnetic coupling layer provided between the first and second magnetic layers so that the first and second magnetic layers are exchange-coupled and magnetizations of the first and second magnetic layers are antiparallel;
- said first magnetic layer having an exchange coupling field Hex1 that is larger than both said coercivity Hc1 and said coercivity Hc2.
2 more elements
A patterned medium comprising:
- a recording surface;
- and
- a plurality of unit recording portions, provided on said recording surface, having boundaries which are separated from adjacent unit recording portions,
- each of said plurality of unit recording portions having a stacked structure comprising:
- a first magnetic layer having a coercivity Hc1;
- a second magnetic layer having a coercivity Hc2;
- and
- a non-magnetic coupling layer provided between said first magnetic layer and said second magnetic layer so that said first and second magnetic layers are exchange-coupled and magnetizations of said first and second magnetic layers are antiparallel;
- said first magnetic layer having an exchange coupling field Hex1 which is larger than both said coercivity Hc1 and said coercivity Hc2.
6 more elements
A magnetic storage apparatus comprising:
- at least one magnetic recording medium;
- and
- at least one head adapted to apply a field to the magnetic recording medium;
- said magnetic recording medium including:
- a first magnetic layer having a coercivity Hc1;
- a second magnetic layer having s coercivity Hc2;
- and
- a non-magnetic coupling layer provided between said first magnetic layer and said second magnetic layer so that said first and second magnetic layers are exchange-coupled and magnetizations of said first and second magnetic layers are antiparallel,
- said first magnetic layer having an exchange coupling field Hex1 which is larger than both said coercivity Hc1 and said coercivity Hc2.
6 more elements
Dependencies are inferred from the claim text.