Spinel ferrite magnetic powder and method for manufacturing the same
AssigneeSony Corporation
InventorKenji KATORI
Life of this patent
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Abstract
To provide a spinel ferrite magnetic powder having excellent characteristics. A method for manufacturing a magnetic powder includes: melting and then quenching a glass-forming component and a spinel ferrite magnetic powder-forming component to manufacture an amorphous body; and heat-treating the amorphous body to precipitate a spinel ferrite magnetic powder. An oxygen partial pressure during the heat treatment is 1.0 kPa or less.
Claims13
A method for manufacturing a magnetic powder, comprising:
- melting and then quenching a glass-forming component and a spinel ferrite magnetic powder-forming component to manufacture an amorphous body;
- and
- heat-treating the amorphous body to precipitate a spinel ferrite magnetic powder, wherein
- an oxygen partial pressure during the heat treatment is 1.0 kPa or less.
A spinel ferrite magnetic powder having uniaxial anisotropy, an average particle size of 25 nm or less, and a coercive force Hc of 2500 Oe or more.
A magnetic powder manufacturing method for manufacturing a spinel ferrite magnetic powder by a glass crystallization method using a glass-forming component containing sodium borate and a spinel ferrite magnetic powder-forming component.
Dependencies are inferred from the claim text.