期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 262, 期 1, 页码 6-14出版社
ELSEVIER
DOI: 10.1016/S0304-8853(03)00011-8
关键词
fine particles; exchange anisotropy; coercivity; hysteresis; maghemite; ferrites
From AC susceptibility, magnetization and Mossbauer spectroscopy measurements, we show the dominant role of the surface properties and surface-to-core exchange coupling on the static and dynamic properties of gamma-Fe2O3 particles (2.7, 4.6 and 8.7 nm) dispersed in a polymer or powdered. Measurements of the switching field of individual particles are presented. demonstrating basic surface effects, (C) 2003 Elsevier Science B.V. All rights reserved.
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