期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 306, 期 1, 页码 1-8出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2006.01.238
关键词
muitiferroics; ferroelecricity; microscopic mechanisms
Multiferroics - materials which are simultaneously (ferro)magnetic and ferroelectric, and often also ferroelastic - attract now considerable attention, both because of the interesting physics involved and as they promise important practical applications. In this paper, I give a survey of microscopic factors determining the coexistence of these properties, and discuss different possible routes to combine them in one material. In particular, the role of the occupation of d-states in transition metal perovskites is discussed, possible role of spiral magnetic structures is stressed, and the novel mechanism of ferroelectricity in magnetic systems due to combination of site-centred and bond-centred charge ordering is presented. Microscopic nature of multiferroic behaviour in several particular materials, including magnetite Fe3O4, is discussed. (C) 2006 Elsevier B.V. All rights reserved.
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