Ferroelectricity in Spiral Magnets

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Maxim Mostovoy
Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
II Physikalisches Institut, Universität zu Köln, Zülplicherstrasse 77, D-50937 Köln, Germany

Received 26 October 2005; published 15 February 2006

Itwas recently observed that the ferroelectrics showing the strongest sensitivityto an applied magnetic field are spiral magnets. We presenta phenomenological theory of inhomogeneous ferroelectric magnets, which describes theirthermodynamics and magnetic field behavior, e.g., dielectric susceptibility anomalies atmagnetic transitions and sudden flops of electric polarization in anapplied magnetic field. We show that electric polarization can alsobe induced at domain walls and that magnetic vortices carryelectric charge.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.067601
DOI:	10.1103/PhysRevLett.96.067601
PACS:	77.80.Fm; 75.30.Fv; 75.60.Ch 77.80.Fm Ferroelectric switching phenomena 75.30.Fv Spin-density waves in magnetically ordered materials 75.60.Ch Magnetic domain walls and domain structure YEAR: 2006
KEYWORDS:	multiferroics, ferroelectric materials, optical susceptibility, magnetic transitions, dielectric polarisation, magnetic domain walls, spin density waves

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