Phys. Rev. Lett. 99, 227201 (2007) [4 pages]
Dual Nature of Improper Ferroelectricity in a Magnetoelectric Multiferroic
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S. Picozzi, 1 K. Yamauchi, 1 B. Sanyal, 2 I. A. Sergienko, 3,4 and E. Dagotto3,41Consiglio Nazionale delle Ricerche–Istituto Nazionale di Fisica della Materia (CNR-INFM), CASTI Regional Laboratory, 67010 L'Aquila, Italy
2Theoretical Magnetism Group, Department of Physics, Uppsala University, Box-530, SE-75121, Uppsala, Sweden
3Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4Department of Physics & Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
Received 8 May 2007; published 26 November 2007
Using first-principles calculations, we study the microscopic origin of ferroelectricity (FE) induced by magnetic order in the orthorhombic HoMnO3. We obtain the largest ferroelectric polarization observed in the whole class of improper magnetic ferroelectrics to date. We find that the two proposed mechanisms for FE in multiferroics, lattice and electronic based, are simultaneously active in this compound: a large portion of the ferroelectric polarization arises due to quantum-mechanical effects of electron orbital polarization, in addition to the conventional polar atomic displacements. An interesting mechanism for switching the magnetoelectric domains by an electric field via a 180° coherent rotation of Mn spins is also proposed.
©2007 The American Physical Society
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