公开(公告)号：US20210287714A1

公开(公告)日：2021-09-16

申请号：US16330010

申请日：2017-09-27

Applicant: SONY CORPORATION

Inventor： Atsushi MURAMATSU ,  Masafumi NAKAYA ,  Masaru TERAKAWA ,  Satoru ABE ,  Natsuki TOYOSAWA ,  Katsunori MAESHIMA

IPC: G11B5/714 ,  H01F1/11 ,  G11B5/65 ,  H01F1/06

Abstract: A method of producing a magnetic powder includes: performing heat treatment on first particles that contain triiron tetraoxide to prepare second particles that contain ε-iron oxide.

公开(公告)号：US20210027807A1

公开(公告)日：2021-01-28

申请号：US17043452

申请日：2019-03-27

Applicant: SONY CORPORATION

Inventor： Natsuki TOYOSAWA ,  Norikatsu FUJISAWA ,  Yuta AKIMOTO ,  Satoru ABE ,  Masaru TERAKAWA ,  Katsunori MAESHIMA ,  Atsushi MURAMATU ,  Masashi NAKATANI

IPC: G11B5/842 ,  H01F1/11 ,  G11B5/706 ,  C01G49/04 ,  C01G49/08 ,  C09C1/24

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.