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	Studies on the magnetic viscosity and the magnetic anisotropy of gamma-fe2o3 powders
	Hou, DL; Nie, XF; Luo, HL
刊名	Applied physics a-materials science & processing
	1998
卷号	66期号:1页码:109-114
ISSN号	0947-8396
通讯作者	Hou, dl()
英文摘要	Granular gamma-fe2o3 powders, acicular gamma-fe2o3, and cofe-gamma-fe2o3 powders are prepared by different methods. particle shapes and mean particle sizes of samples are determined by transmission electron microscopy (tem). magnetic parameters are measured by a vibrating sample magnetometer (vsm) at different temperatures. effective magnetic anisotropy constants k-e of granular gamma-fe2o3 powders at different temperatures are obtained by using the law of approach to saturation (lats). k-e values of acicular gamma-fe2o3 and cofe-gamma-fe2o3 powders are measured by a magnetotorquemeter. it is found for the first time that the variation tendency of k-e with temperature for granular gamma-fe2o3 is about the same as that of shape magnetic anisotropy k-sh. fluctuation field h-f and activation volume v-f of samples are measured. a theoretical expression of v-f is derived. for granular gamma-fe2o3 powders, calculated activation volumes are consistent with experimental ones at different temperatures. but as for acicular gamma-fe2o3 powders, calculated activation volumes are larger than experimental ones. experimental results show that magnetization reversal of granular gamma-fe2o3 at different temperatures is close to homogeneous rotation.
WOS关键词	PARTICLES ; COERCIVITY ; IRON
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
语种	英语
出版者	SPRINGER VERLAG
WOS记录号	WOS:000072420100017
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2373821
专题	物理研究所
通讯作者	Hou, DL
作者单位	1.Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China 2.Acad Sinica, Inst Phys, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Hou, DL,Nie, XF,Luo, HL. Studies on the magnetic viscosity and the magnetic anisotropy of gamma-fe2o3 powders[J]. Applied physics a-materials science & processing,1998,66(1):109-114.
APA	Hou, DL,Nie, XF,&Luo, HL.(1998).Studies on the magnetic viscosity and the magnetic anisotropy of gamma-fe2o3 powders.Applied physics a-materials science & processing,66(1),109-114.
MLA	Hou, DL,et al."Studies on the magnetic viscosity and the magnetic anisotropy of gamma-fe2o3 powders".Applied physics a-materials science & processing 66.1(1998):109-114.

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