Electrically controllable spontaneous magnetism in nanoscale mixed phase multiferroics

被引：165

作者：

He, Q. ^{[1
]}

Chu, Y. -H. ^{[2
]}

Heron, J. T. ^{[3
]}

Yang, S. Y. ^{[1
]}

Liang, W. I. ^{[2
]}

Kuo, C. Y. ^{[4
]}

Lin, H. J. ^{[4
]}

Yu, P. ^{[1
]}

Liang, C. W. ^{[2
]}

Zeches, R. J. ^{[3
]}

Kuo, W. C. ^{[5
]}

Juang, J. Y. ^{[5
]}

Chen, C. T. ^{[4
]}

Arenholz, E. ^{[6
]}

Scholl, A. ^{[6
]}

Ramesh, R. ^{[1
,3
,7
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

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

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

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[5] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan

[6] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[7] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

NATURE COMMUNICATIONS | 2011年 / 2卷

基金：

美国国家科学基金会;

关键词：

FERROMAGNETISM; INTERFACES; OXIDES;

D O I：

10.1038/ncomms1221

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：

Magnetoelectrics and multiferroics present exciting opportunities for electric-field control of magnetism. However, there are few room-temperature ferromagnetic-ferroelectrics. Among the various types of multiferroics the bismuth ferrite system has received much attention primarily because both the ferroelectric and the antiferromagnetic orders are quite robust at room temperature. Here we demonstrate the emergence of an enhanced spontaneous magnetization in a strain-driven rhombohedral and super-tetragonal mixed phase of BiFeO(3). Using X-ray magnetic circular dichroism-based photoemission electron microscopy coupled with macroscopic magnetic measurements, we find that the spontaneous magnetization of the rhombohedral phase is significantly enhanced above the canted antiferromagnetic moment in the bulk phase, as a consequence of a piezomagnetic coupling to the adjacent tetragonal-like phase and the epitaxial constraint. Reversible electric-field control and manipulation of this magnetic moment at room temperature is also shown.

引用

页数：5

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