Relationship between ferroelectricity and Dzyaloshinskii-Moriya interaction in multiferroics and the effect of bond-bending

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C. D. Hu
Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan 10617, Republic of China

Received 1 November 2007; revised 13 April 2008; published 12 May 2008

Westudied the microscopic mechanism of multiferroics, in particular, with the“spin current” model [H. Katsura et al., Phys. Rev. Lett. 95,057205 (2005)]. Starting from a system with helical spin configuration,we solved for the forms of the electron wave functionsand analyzed their characteristics. The relation between ferroelectricity and Dzyaloshinskii-Moriyainteraction [I. Dzyaloshinskii, J. Phys. Chem. Solids 4, 241 (1958)and T. Moriya, Phys. Rev. 120, 91 (1960)] is clearlyestablished. There is also a simple relation between the electricpolarization and the wave vector of magnetic orders. Finally, weshow that the bond-bending existing in transition metal oxides canenhance ferroelectricity.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.77.174418
DOI:	10.1103/PhysRevB.77.174418
PACS:	75.80.+q; 77.80.-e 75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction 77.80.-e Ferroelectricity and antiferroelectricity YEAR: 2008
KEYWORDS:	ferroelectricity, multiferroics, wave functions

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