Spin Wave Measurements over the Full Brillouin Zone of Multiferroic BiFeO3

被引：89

作者：

Jeong, Jaehong ^{[1
]}

Goremychkin, E. A. ^{[2
]}

Guidi, T. ^{[2
]}

Nakajima, K. ^{[3
]}

Jeon, Gun Sang ^{[4
]}

Kim, Shin-Ae ^{[5
]}

Furukawa, S. ^{[6
]}

Kim, Yong Baek ^{[6
]}

Lee, Seongsu ^{[5
]}

Kiryukhin, V. ^{[7
,8
]}

Cheong, S-W. ^{[7
,8
]}

Park, Je-Geun ^{[1
,9
]}

机构：

[1] Seoul Natl Univ, FPRD Dept Phys & Astron, Ctr Strongly Correlated Mat Res, Seoul 151747, South Korea

[2] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[3] J PARC Ctr, Neutron Sci Sect, MLF Div, Ibaraki 3191106, Japan

[4] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea

[5] Korea Atom Energy Res Inst, Div Neutron Sci, Taejon 305353, South Korea

[6] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

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

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

[9] Seoul Natl Univ, Ctr Korean J PARC Users, Seoul 151747, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

ELECTRIC-FIELD CONTROL;

D O I：

10.1103/PhysRevLett.108.077202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using the inelastic neutron scattering technique, we measured the spin wave dispersion over the entire Brillouin zone of room temperature multiferroic BiFeO3 single crystals with magnetic excitations extending to as high as 72.5 meV. The full spin waves can be explained by a simple Heisenberg Hamiltonian with a nearest-neighbor exchange interaction (J = 4.38 meV), a next-nearest-neighbor exchange interaction (J' = 0.15 meV), and a Dzyaloshinskii-Moriya-like term (D = 0.107 meV). This simple Hamiltonian determined, for the first time, for BiFeO3 provides a fundamental ingredient for understanding the novel magnetic properties of BiFeO3.

引用

页数：5

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