Magnetic particle and method of preparing the same, and magnetic recording medium
AssigneeFUJIFILM Corporation
InventorYasushi Hattori
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Abstract
An aspect of the present invention relates to a magnetic particle obtained by heat-treating a hexagonal ferrite magnetic material in reducing atmosphere containing hydrocarbon gas.
Claims20
A magnetic particle, which is obtained by heat-treating a hexagonal ferrite magnetic material having a coercive force of equal to or higher than 230 kA/m in a reducing atmosphere containing a hydrocarbon gas.
A magnetic particle, which is comprised of a hexagonal ferrite magnetic material in which α-Fe and a carbon component are detected by X-ray diffraction analysis, and
- which has a coercive force of equal to or higher than 120 kA/m but less than 230 kA/m.
A method of preparing a magnetic particle, which comprises heat-treating a hexagonal ferrite magnetic material having a coercive force of equal to or higher than 230 kA/m in a reducing atmosphere containing a hydrocarbon gas.
Dependencies are inferred from the claim text.