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Electrically controllable spontaneous magnetism in nanoscale mixed phase multiferroics

Publication Type

Journal Article

Authors

He, Q, 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, Ramamoorthy Ramesh

DOI

10.1038/ncomms1221

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 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. © 2011 Macmillan Publishers Limited. All rights reserved.

Journal

Nature Communications

Volume

Year of Publication

2011

ISSN

20411723

Notes

cited By 122

Research Areas

Ramesh Lab