Title:
六方晶フェライト磁性粉末の製造方法ならびに磁気記録媒体およびその製造方法
Document Type and Number:
Japanese Patent JP5284707
Kind Code:
B2
Abstract:
An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising preparing a melt by melting a starting material mixture, wherein the starting material mixture comprises at least one hexagonal ferrite-forming component and glass-forming component comprising at least one B2O3 component and a content of the B2O3 component in the mixture ranges from 15 to 27 mole percent in terms of B2O3; rapidly cooling the melt to obtain a solid having a saturation magnetization level of equal to or lower than 0.6 A.m2/kg; and heating the solid to a temperature range of 600 to 690° C. and maintaining the solid within the temperature range to precipitate a hexagonal ferrite magnetic powder having an average plate diameter ranging from 15 to 25 nm.
Inventors:
Nobuo Yamazaki
Toshio Tada
Toshio Tada
Application Number:
JP2008189410A
Publication Date:
September 11, 2013
Filing Date:
July 23, 2008
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
C01B33/12; C01G49/00; C01B35/10; C04B35/26; G11B5/70; G11B5/706; G11B5/714; G11B5/842; H01F1/11
Domestic Patent References:
| JP2006120823A | ||||
| JP2007099595A | ||||
| JP2006041493A | ||||
| JP7201547A | ||||
| JP2005340690A | ||||
| JP2005213111A | ||||
| JP61010210A |
Attorney, Agent or Firm:
Patent Service Corporation Patent Office Sykes