HEXAGONAL FERRITE POWDER, MAGNETIC RECORDING MEDIUM, AND METHOD OF HEXAGONAL FERRITE POWDER
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United States of America Patent
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Oct 5, 2017
app pub date -
Mar 30, 2017
filing date -
Mar 31, 2016
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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.
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