期刊
SCRIPTA MATERIALIA
卷 53, 期 4, 页码 453-456出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2005.04.035
关键词
magnetization reversal; L1(0) magnets; exchange interaction; discrete pinning
Magnetization processes in particulate L1(0) FePt nanostructures are investigated by model calculations and numerical simulations. The systems considered include anisotropic nanograins embedded in non-magnetic matrix; randomly oriented nanoclusters embedded in a C matrix, and nanocomposites of FePt particles in a semi-hard matrix. The reversal mechanisms depend on both intra- and intergranular features. Quasi-coherent rotation dominates the reversal in weakly-coupled granular magnets, but interface imperfections yield a disproportionately strong coercivity reduction. Strong intergranular exchange leads to a transition to a discrete pinning regime, which is accompanied by a coercivity maximum. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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