Magnetic recording medium using hexagonal ferrite powder
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United States of America Patent
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Aug 7, 2018
Grant Date -
Mar 9, 2017
app pub date -
Sep 7, 2016
filing date -
Sep 8, 2015
priority date (Note) -
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Abstract
The magnetic recording medium has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is hexagonal ferrite powder containing, based on number of particles, greater than or equal to 80% isotropic particles that satisfy the relation 1: major axis length/minor axis length <1.2, with an average particle size of the hexagonal ferrite powder being less than or equal to 30 nm, and a squareness in a vertical direction of the magnetic layer being greater than or equal to 0.65 but less than or equal to 1.00.
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