<p>A magnetic material is provided that has an iron oxide phase whose principal phase is a crystal of a structure which has the same space group as µ-Fe 2 O 3 crystal and in which Al is substituted for a portion of the Fe sites of the µ-Fe 2 O 3 crystal. The molar ratio of A1 to Fe in the iron oxide phase, when expressed as Al: Fe = x : (2 - x), satisfies 0 < x < 1. The value of x is preferably in the range of 0.3 to 0.7. The average particle diameter of the powder determined from a TEM image is preferably 5 to 200 nm, more preferably 10 to 100 nm. The magnetic material has very high practical value because it enables the extremely high coercive force Hc of the µ-Fe 2 O 3 crystal to be regulated to a level enabling utilization in magnetic recording medium and various other applications. The magnetic powder can be produced by a method combining the reverse micelle method and the sol-gel method.</p>
申请公布号
EP1900690(A1)
申请公布日期
2008.03.19
申请号
EP20070016104
申请日期
2007.08.16
申请人
THE UNIVERSITY OF TOKYO;DOWA ELECTRONICS MATERIALS CO., LTD.