Spin dynamics, antiferrodistortion and magnetoelectric interaction in multiferroics. The case of BiFeO3

被引：8

作者：

Davydova, M. D. ^{[1
]}

Zvezdin, K. A. ^{[2
]}

Mukhin, A. A. ^{[3
]}

Zvezdin, A. K. ^{[2
,4
]}

机构：

[1] MIT, Phys, 182 Mem Dr, Cambridge, MA 02139 USA

[2] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow, Russia

[3] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia

[4] Natl Res Univ, Fac Phys, Higher Sch Econ, Moscow 101000, Russia

来源：

PHYSICAL SCIENCES REVIEWS | 2020年 / 5卷 / 12期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

magnetic order; antiferrodistortion; multiferroics; BFO; magnetoelectric effect; phase transitions; MODULATED STRUCTURE; PHASE-TRANSITIONS; BISMUTH FERRITE; FIELD CONTROL; RARE-EARTH; ELECTROMAGNONS; FILMS;

D O I：

10.1515/psr-2019-0070

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We present a theoretical study of the spin dynamics in perovskite-like multiferroics with homogeneous magnetic order in the presence of external magnetic and electric fields. A particular example of such material is BeFeO3 in which the spin cycloid can be suppressed by application of external magnetic field, doping or by epitaxial strain. Understanding the effect of the external electric field on the spin-wave spectrum of these systems is required for devices based on spin wave interference and other innovative advances of magnonics and spintronics. Thus, we propose a model for BiFeO3 in which the thermodynamic potential is expressed in terms of polarization P, antiferrodistortion Omega, antiferromagnetic moment L and magnetization M. Based on this model, we derive the corresponding equations of motion and demonstrate the existence of electromagnons, that is, magnons that can be excited by electric fields. These excitations are closely related to the magnetoelectric effect and the dynamics of the antiferrodistortion Omega. Specifically, the influence of the external electric field on the magnon spectra is due to reorientation of both polarization P and antiferrodistortion Omega under the influence of the electric field and is linked to emergence of a field-induced anisotropy.

引用

页数：15

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