Compensated crystalline superlattice ferrimagnets
AssigneeSeagate Technology LLC
InventorsRandall Harry Victora, Charles Frederick Brucker
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Abstract
The present invention relates to compensated crystalline superlattice ferrimagnets. The ferrimagnets include multiple ferromagnetic layers having different magnetic disordering temperatures in combination with antiferromagnetically coupled layers. The crystalline ferromagnetic layers may include metals or alloys such as Ni, Co and Fe. The crystalline antiferromagnetically coupled layers may include metals or alloys such as Rh, Ir, Cr, Ru, Os, W and Mn. The superlattice ferrimagnets may be used in such applications as data storage or memory layers in thermally assisted magnetic recording media.
Claims27
A compensated crystalline superlattice ferrimagnet comprising:
- a first ferromagnetic layer;
- a second ferromagnetic layer having a different magnetic disordering temperature than the first ferromagnetic layer;
- and
- antiferromagnetically coupled layers between the first and second ferromagnetic layers.
A method of making a compensated crystalline superlattice ferrimagnet, the method comprising:
- depositing a first ferromagnetic layer on a substrate;
- depositing antiferromagnetically coupled layers on the first ferromagnetic layer;
- and
- depositing a second ferromagnetic layer on the antiferromagnetically coupled layers, wherein the first and second ferromagnetic layers have different disordering temperatures.
A thermally assisted magnetic recording media comprising:
- a substrate;
- a memory layer deposited on the substrate, wherein the memory layer comprises a compensated crystalline superlattice ferrimagnet including:
- a first ferromagnetic layer;
- a second ferromagnetic layer having a different magnetic disordering temperature than the first ferromagnetic layer;
- and
- antiferromagnetically coupled layers between the first and second ferromagnetic layers;
- and
- a copy layer deposited on the memory layer.
Dependencies are inferred from the claim text.