Giant ferroelectric polarization and electric reversal of strong spontaneous magnetization in multiferroic Bi2FeMoO6

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:441

Article

Chen, Peng¹  Liu, Bang-Gui^1,2 

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China

关键词: Multiferroics;    Magnetoelectric;    BiFeO3;   

DOI  :  10.1016/j.jmmm.2017.06.019

来源: Elsevier

【 摘 要 】

BiFeO3 is the most famous multiferroic material, but it has no strong spontaneous magnetization due to its antiferromagnetism. Here we show that giant ferroelectric polarization and strong spontaneous magnetization can be both realized in double perovskite Bi2FeMoO6 with R-3 (# 146) space group based on BiFeO3. Our first-principles phonon spectra establishes that this multiferroic R-3 phase is stable. Our systematic calculations show that it is a spin-polarized semiconductor with gap reaching to 0.54-0.85 eV and has a strong ferroelectric polarization of 85 mu C/cm(2). This ferroelctricity is comparable with that of BiFeO3, but here obtained is a strong ferrimagnetism. Both ferroelectric polarization and magnetic easy axis are shown to be in pseudocubic [111] orientation. Our further analysis shows that the macroscopic spontaneous magnetization can be deterministically reversed through a three-step path by external electric field. Therefore, we believe that this Bi2FeMoO6 material can be used to design new multifunctional materials and achieve high-performance devices. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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