METHOD FOR MANUFACTURING MAGNETIC PARTICLE, MAGNETIC PARTICLE AND MAGNETIC RECORDING MEDIUM,申请号JP20060045207-传众专利搜索

METHOD FOR MANUFACTURING MAGNETIC PARTICLE, MAGNETIC PARTICLE AND MAGNETIC RECORDING MEDIUM

申请公布号：JP2007036183(A)

申请号：JP20060045207

申请日期：2006.02.22

申请公布日期：2007.02.08

申请人：

FUJIFILM HOLDINGS CORP

发明人：WAKI KOKICHI;HATTORI KOJI

分类号：H01F1/11;B22F1/00;B22F9/24;C01B21/06;G11B5/706;G11B5/714;G11B5/842

主分类号：H01F1/11

摘要：<P>PROBLEM TO BE SOLVED: To a provide magnetic particle which exhibit high coercivity, mono-dispersibility of a particle diameter and the uniformity of a magnetic property, its manufacturing method and a magnetic recording medium. <P>SOLUTION: The method for manufacturing the magnetic particle includes a synthesis process for synthesizing an iron particle in a liquid phase and a nitriding process. Further, a process for sizing the average particle diameter to 5-25 nm and a process for substantially shaping the particle into a sphere are performed. The magnetic particle includes at least an Fe<SB>16</SB>N<SB>2</SB>phase. The average particle diameter of the Fe<SB>16</SB>N<SB>2</SB>phase is 9-11 nm and the coefficient of the variation of the particle diameter is 15% or less. The magnetic recording medium includes the magnetic particle in its magnetic layer. <P>COPYRIGHT: (C)2007,JPO&INPIT