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US 2017/0287515 A1Published application
Hexagonal ferrite powder, magnetic recording medium, and method of hexagonal ferrite powder
AssigneeFUJIFILM Corporation
InventorMasashi SHIRATA
Life of this patent
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Abstract
The hexagonal ferrite powder has an activation volume of greater than or equal to 800 nm3 but less than 1,200 nm3, a rare earth atom content falling within a range of 0.5 to 8.0 atom % per 100 atom % of iron atoms, and a localized presence of rare earth atoms in the surface layer portion, as well as is in the form of ellipsoidal powder.
Claims16
Hexagonal ferrite powder,
- which has:
- an activation volume of greater than or equal to 800 nm3 but less than 1,200 nm3;
- a rare earth atom content falling within a range of 0.5 to 8.0 atom % per 100 atom % of iron atoms;
- and
- a localized presence of rare earth atoms in the surface layer portion;
- and
- which is in the farm of ellipsoidal powder.
4 more elements
Dependencies are inferred from the claim text.