RFeO3多铁性材料新体系

RFeO_3 Multiferroic New System

在已知的多铁性材料中，由磁性诱导铁电性的第二类多铁性材料具有较强的磁电耦合，但这类材料的临界温度往往很低，且自发极化强度很小。而正交结构的稀土铁氧体（RFeO3）具有很高的反铁磁相变温度（620-760K），最近的研究表明其具有较强的室温铁电性，因而有望成为新的室温多铁性材料。本文综述RFeOs多铁性研究的最新进展，并讨论其可能的多铁性机制。

Among the multiferroic materials, type-II multiferroic materials where the ferroectricity is induced by the magnetism, indicate relatively strong magnetoelectric coupling. However, the critical temperature is generally very low in such kind of materials, and the spontaneous polarization is very small. On the other hand, the rear earth orthoferrites （RFeO3） indicate very high TN （620-760 K）, and the recent investigations have indicated the relative strong ferroelectricity at room temperature, and they are expected as the promising new system of room temperature multiferroic materials. In the present review, the updated progresses on multiferroic RFeO3 are reported together with the discussion on the possible multiferroic mechanisms.