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Novel magnetic arrangement and structural phase transition induced by spin–lattice coupling in multiferroics

Published online by Cambridge University Press:  18 December 2013

Satadeep Bhattacharjee ,
Dovran Rahmedov ,
Laurent Bellaiche  and
Dawei Wang
Satadeep Bhattacharjee
Affiliation:
Department of Physics and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701
Dovran Rahmedov
Affiliation:
Department of Physics and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701
Laurent Bellaiche
Affiliation:
Department of Physics and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701
Dawei Wang
Affiliation:
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, China
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Abstract

Using an effective Hamiltonian of mutiferroic BiFeO3 (BFO) as a toy model, we explore the effect of the coefficient, C, characterizing the strength of the spin–current interaction, on physical properties. We observe that for larger C values and below a critical temperature, the magnetic moments organize themselves in a novel cycloid, which propagates along a low-symmetry direction and is associated with a structural phase transition from polar rhombohedral to a polar triclinic state. We emphasize that both of these magnetic and structural transitions are results of a remarkable self-organization of different solutions of the spin–current model.

Type
Research Letters
Information
MRS Communications , Volume 3 , Issue 4 , December 2013 , pp. 213 - 218
Copyright
Copyright © Materials Research Society 2013 

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