Long-wavelength magnetic and magnetoelectric excitations in the ferroelectric antiferromagnet BiFeO3

被引：64

作者：

Talbayev, D. ^{[1
]}

Trugman, S. A. ^{[2
]}

Lee, Seongsu ^{[3
,4
]}

Yi, Hee Taek ^{[3
,4
]}

Cheong, S-W ^{[3
,4
]}

Taylor, A. J. ^{[2
]}

机构：

[1] Yale Univ, Dept Chem, New Haven, CT 06520 USA

[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[3] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

[4] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 09期

关键词：

MULTIFERROICS;

D O I：

10.1103/PhysRevB.83.094403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a terahertz spectroscopic study of magnetic excitations in ferroelectric antiferromagnet BiFeO3. We interpret the observed spectrum of long-wavelength magnetic resonance modes in terms of the normal modes of thematerial's cycloidal antiferromagnetic structure. We find that the modulated Dzyaloshinski-Moriya interaction leads to a splitting of the out-of-plane resonance modes. We also assign one of the observed absorption lines to an electromagnon excitation that results from the magnetoelectric coupling between the ferroelectric polarization and the cycloidal magnetic structure of BiFeO3.

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页数：5

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