Noncollinear magnetic structure of CoFe2O4small particles
作者:
K. Haneda,
A. H. Morrish,
期刊:
Journal of Applied Physics
(AIP Available online 1988)
卷期:
Volume 63,
issue 8
页码: 4258-4260
ISSN:0021-8979
年代: 1988
DOI:10.1063/1.340197
出版商: AIP
数据来源: AIP
摘要:
The magnetic structure of small CoFe2O4particles has been investigated as a function of the particle size. Samples (in the 10–100 nm size range and up) were prepared by chemical precipitation followed by a heat treatment at relatively low temperatures. Mo¨ssbauer spectra of the57Fe nuclei, obtained with a longitudinal magnetic applied field, unambiguously establish that a noncollinear structure exists that is most pronounced for the smallest particles. The analysis indicates that a surface effect of the crystallites that make up a particle is the origin of this phenomenon. A model is proposed in which the CoFe2O4crystallites that make up a particle consist of a core with the usual spin arrangement and a boundary surface layer with atomic moments inclined to the direction of the net magnetization. The temperature dependency of this structure is also examined.
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