期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 300, 期 1, 页码 192-197出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2005.10.061
关键词
magnetic nanoparticles; dipolar interaction; superspin glass; superferromagnetism
Discontinuous magnetic multilayers [CoFe/Al2O3] are studied by use of magnetometry, susceptometry and numeric simulations. Soft ferromagnetic Co80Fe20 nanoparticles are embedded in a diamagnetic insulating a-Al2O3 matrix and can be considered as homogeneously magnetized superspins exhibiting randomness of size (viz. moment), position and anisotropy. Lacking intra-particle core-surface ordering, generic freezing processes into collective states rather than individual particle blocking are encountered. With increasing particle density one observes first superspin glass and then superferromagnetic domain state behavior. The phase diagram resembles that of a dilute disordered ferromagnet. Criteria for the identification of the individual phases are given. (c) 2005 Elsevier B.V. All rights reserved.
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