Optical properties and magnetochromism in multiferroic BiFeO3

被引：151

作者：

Xu, X. S. ^{[1
]}

Brinzari, T. V. ^{[1
]}

Lee, S. ^{[2
,3
]}

Chu, Y. H. ^{[4
,5
]}

Martin, L. W. ^{[4
,5
,6
]}

Kumar, A. ^{[7
]}

McGill, S. ^{[8
]}

Rai, R. C. ^{[1
]}

Ramesh, R. ^{[4
,5
,6
]}

Gopalan, V. ^{[7
]}

Cheong, S. W. ^{[2
,3
]}

Musfeldt, J. L. ^{[1
]}

机构：

[1] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA

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

[3] Rutgers State Univ, Dept Phys, Piscataway, NJ 08854 USA

[4] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[5] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[6] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[7] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[8] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 13期

基金：

美国国家科学基金会;

关键词：

antiferromagnetic materials; bismuth compounds; crystal field interactions; ferrites; ferroelectric materials; magnetic domains; magnetic transitions; magneto-optical effects; magnons; multiferroics; spin dynamics; ABSORPTION; ALPHA-FE2O3; SPECTRUM;

D O I：

10.1103/PhysRevB.79.134425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to investigate spin-charge coupling in multiferroic oxides, we measured the optical properties of BiFeO3. Although the direct 300 K charge gap is observed at 2.67 eV, absorption onset actually occurs at much lower energy with Fe3+ excitations at 1.41 and 1.90 eV. Temperature and magnetic-field-induced spectral changes reveal complex interactions between on-site crystal-field and magnetic excitations in the form of magnon sidebands. We employ the sensitivity of these magnon sidebands to map out the magnetic-field-temperature phase diagram which demonstrates optical evidence for spin spiral quenching above 20 T and suggests a spin domain reorientation near 10 T.

引用

页数：4

共 28 条

[21] Does the modulated magnetic structure of BiFeO3 change at low temperatures? [J].