Recording layer for heat assisted magnetic recording
AssigneeSeagate Technology LLC
InventorsYingguo Peng, Jan-Ulrich Thiele, Ganping Ju, Thomas Patrick Nolan, Yinfeng Ding, Alexander Qihong Wu
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Abstract
A magnetic stack includes multiple granular layers, at least one of the multiple granular layers is a magnetic layer that includes exchange coupled magnetic grains separated by a segregant having Ms greater than 100 emu/cc. Each of the multiple granular layers have anisotropic thermal conductivity.
Claims20
A magnetic stack suitable for use in magnetic storage, comprising:
- a first granular magnetic layer including first magnetic grains separated by a first segregant, the first segregant comprising a non-magnetic material;
- and
- a second granular magnetic layer including second magnetic grains separated by a second segregant, the second segregant comprising a magnetic material, wherein the second segregant has thermal conductivity less than about 5 Watts/mK, and the first and second magnetic layers have anisotropic thermal conductivity.
A magnetic medium suitable for use in magnetic storage, comprising:
- a first magnetic layer comprising first magnetic grains separated by a first segregant having Ms less than about 100 emu/cc;
- and
- a second magnetic layer comprising second magnetic grains separated by a second segregant having thermal conductivity less than about 5 Watts/mK and Ms greater than about 100 emu/cc, wherein a thermal conductivity component of the first and second magnetic layers normal to a surface of the magnetic medium is greater than a thermal conductivity component of the first and second magnetic layers parallel to the surface of the medium.
A magnetic stack suitable for use in magnetic storage, comprising multiple granular layers, at least one of the multiple granular layers comprising a magnetic layer including exchange coupled magnetic grains separated by a segregant having thermal conductivity less than about 5 Watts/mK and Ms greater than 100 emu/cc, each of the multiple granular layers having anisotropic thermal conductivity.
Dependencies are inferred from the claim text.