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US 11,830,533 B2Granted
Method of producing magnetic powder and method of producing magnetic recording medium
AssigneeSony Corporation
InventorsNatsuki Toyosawa, Norikatsu Fujisawa, Yuta Akimoto, Satoru Abe, Masaru Terakawa, Katsunori Maeshima, Atsushi Muramatu, Masafumi Nakaya
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Abstract
[Solving Means] A method of producing a magnetic powder includes: coating a surface of each of silica-coated precursor particles with at least one type of coating agent of a metal chloride or a sulfate; and firing the precursor particles coated with the coating agent.
Claims16
A method of producing a magnetic powder, comprising:
- coating a surface of each of silica-coated precursor particles with at least one type of a coating agent including a metal chloride or a sulfate;
- and
- firing the silica-coated precursor particles coated with the coating agent,
- wherein the silica-coated precursor particles are phase-transformed by the firing.
1 more element
A method of producing a magnetic recording medium, comprising:
- coating a surface of each of silica-coated precursor particles with at least one type of coating agent including a metal chloride or a sulfate;
- preparing magnetic particles by firing the precursor silica-coated particles coated with the coating agent;
- removing the silica coating and the coating agent from the magnetic particles;
- and
- forming a recording layer using the magnetic particles after the removing.
2 more elements
Dependencies are inferred from the claim text.