摘要
Multiferroic materials,by definition,process two or more ferroic order parameters.For example,the coexistence of spontaneously polarization and spontaneous magnetization enables coupling between polarization and magnetic field（direct magnetoelectric effect）,or between magnetization and electric field（converse magnetoelectric effect）.Multiferroic materials have attracted increasing interest in the past decade.
基金
supported by the National Natural Science Foundation of China(Grant No.51402164 and 51332001)
Tsinghua University Initiative Scientific Research Program(Grant No.2014Z21010)
