Bulk magnetoelectricity in the hexagonal manganites and ferrites

Hena Das, Aleksander L. Wysocki, Yanan Geng, Weida Wu and Craig J. Fennie ()
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Hena Das: School of Applied and Engineering Physics, Cornell University, 224 Clark Hall, Ithaca, New York 14853, USA
Aleksander L. Wysocki: School of Applied and Engineering Physics, Cornell University, 224 Clark Hall, Ithaca, New York 14853, USA
Yanan Geng: Rutgers University
Weida Wu: Rutgers University
Craig J. Fennie: School of Applied and Engineering Physics, Cornell University, 224 Clark Hall, Ithaca, New York 14853, USA

Nature Communications, 2014, vol. 5, issue 1, 1-11

Abstract: Abstract Improper ferroelectricity (trimerization) in the hexagonal manganites RMnO3 leads to a network of coupled structural and magnetic vortices that induce domain wall magnetoelectricity and magnetization (M), neither of which, however, occurs in the bulk. Here we combine first-principles calculations, group-theoretic techniques and microscopic spin models to show how the trimerization not only induces a polarization (P) but also a bulk M and bulk magnetoelectric (ME) effect. This results in the existence of a bulk linear ME vortex structure or a bulk ME coupling such that if P reverses so does M. To measure the predicted ME vortex, we suggest RMnO3 under large magnetic field. We suggest a family of materials, the hexagonal RFeO3 ferrites, also display the predicted phenomena in their ground state.

Date: 2014
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DOI: 10.1038/ncomms3998

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