期刊
FERROELECTRICS
卷 354, 期 -, 页码 77-+出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00150190701454602
关键词
multiferroics; colossal magnetoelectric effect; ferroelectricity; antiferromagnetism; neutron diffraction; magnetic field; RMn2O5
A review is given on the studies of microscopic magnetic properties and macroscopic dielectric properties as functions of temperature, magnetic field, and the variety of R3+ (R = rare-earth, Bi, and Y) ions in the multifcrroic RMn2O5 compounds by neutron diffraction and dielectric measurements. We have observed successive dielectric and magnetic phase transitions, which concomitantly takes place and a so-called multiferroics is realized. In this system, the ferroelectricity is magnetically induced and the commensurate magnetism is indispensable to produce a spontaneous electric polarization. The microscopic origin of the magnetically induced ferroelectricity and the role of rare-earth magnetic moment for a colossal magnetoelectric effect in RMn2O5 will be discussed in the viewpoint of the magnetic structure.
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