Laminated Exchange Coupling Adhesion (LECA) Media For Heat Assisted Magnetic Recording
AssigneeSeagate Technology LLC
InventorsBin Lu, Ganping Ju
Life of this patent
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Abstract
An apparatus includes a plurality of bilayer structures positioned adjacent to each other, each of the bilayer structures including a first layer of magnetic material having a first Curie temperature and a second layer of magnetic material positioned adjacent to the first layer, wherein the second layer has a second Curie temperature that is lower than the first Curie temperature, and magnetic grains of the first layer are unstable when the second layer of magnetic material is heated above the second Curie temperature. The recording temperature is reduced due to the smaller switching volume achieved by using vertically decoupled laminations at elevated temperatures.
Claims22
An apparatus comprising:
- a plurality of bilayer structures positioned adjacent to each other, each of the bilayer structures including a first layer of magnetic material having a first Curie temperature and a second layer of magnetic material positioned adjacent to the first layer, wherein the second layer has a second Curie temperature that is lower than the first Curie temperature, and magnetic grains of the first layer are unstable when the second layer of magnetic material is heated above the second Curie temperature.
An apparatus comprising:
- first and second layers of magnetic materials positioned on opposite sides of a third layer of magnetic material, wherein the first and second layers have Curie temperatures higher than the Curie temperature of the third layer, and wherein magnetic grains of the first and second layers are unstable when the third layer of magnetic material is heated above its Curie temperatures.
An apparatus comprising:
- first and second layers of magnetic materials positioned on opposite sides of a third layer of magnetic material, wherein the first and second layers have Curie temperatures lower than the Curie temperature of the third layer, and wherein magnetic grains of the third layer are unstable when the first and second layers of magnetic material are heated above their Curie temperatures.
An apparatus comprising:
- a plurality of bilayer structures positioned adjacent to each other, each of the bilayer structures including a first layer of magnetic material having a first Curie temperature and a second layer of magnetic material positioned adjacent to the first layer, wherein the second layer has a second Curie temperature that is lower than the first Curie temperature, and the magnetic grains in the first layer have diameters of between about 1 nm and about 10 nm, and magnetic grains in the second layer have diameters of between about 1 nm and about 1000 nm.
An apparatus comprising:
- a plurality of bilayer structures positioned adjacent to each other, each of the bilayer structures including a first layer of magnetic material having a first Curie temperature and a second layer of magnetic material positioned adjacent to the first layer, wherein the second layer has a second Curie temperature that is lower than the first Curie temperature, and the first and second layers of magnetic material are magnetically coupled to each other at room temperature and magnetically uncoupled when one of the layers of magnetic material is heated above its Curie temperature.
Dependencies are inferred from the claim text.