Electrically controllable spontaneous magnetism in nanoscale mixed phase multiferroics

Q. He (), Y. -H. Chu (), J. T. Heron, S. Y. Yang, W. I. Liang, C.Y. Kuo, H. J. Lin, P. Yu, C. W. Liang, R. J. Zeches, W. C. Kuo, J. Y. Juang, C. T. Chen, E. Arenholz, A. Scholl and R. Ramesh
Additional contact information
Q. He: University of California
Y. -H. Chu: National Chiao Tung University
J. T. Heron: University of California
S. Y. Yang: University of California
W. I. Liang: National Chiao Tung University
C.Y. Kuo: National Synchrotron Radiation Research Center
H. J. Lin: National Synchrotron Radiation Research Center
P. Yu: University of California
C. W. Liang: National Chiao Tung University
R. J. Zeches: University of California
W. C. Kuo: National Chiao Tung University
J. Y. Juang: National Chiao Tung University
C. T. Chen: National Synchrotron Radiation Research Center
E. Arenholz: Advanced Light Source, Lawrence Berkeley National Laboratory
A. Scholl: Advanced Light Source, Lawrence Berkeley National Laboratory
R. Ramesh: University of California

Nature Communications, 2011, vol. 2, issue 1, 1-5

Abstract: Abstract 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 BiFeO3. 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.

Date: 2011
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DOI: 10.1038/ncomms1221

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