Presentation
Understanding the spin-driven polarizations in BiMO3(M=3d transition metals) multiferroics
American Physical Society, APS March Meeting 2016
(2016)
Abstract
Bismuth ferrite (BiFeO3), a promising multiferroic, stabilizes in a perovskite type rhombohedral crystal structure (space group R3c) at room temperature. Recently, it has been reported that in its ground state it possess a huge spin-driven polarization [1]. To probe the underlying mechanism of this large spin-phonon response, we examine these couplings within other Bi based 3d transition metal oxides BiMO3(M= Ti, V, Cr, Mn, Fe, Co, Ni) using density functional theory. Our results demonstrate that this large spin-driven polarization is a consequence of symmetry breaking due to competition between ferroelectric distortions and anti-ferrodistortive octahedral rotations. Furthermore, we find a strong dependence of these enhanced spin-driven polarizations on the crystal structure; with the rhombohedral phase having the largest spin-induced atomic distortions along [111]. These results give us significant insights into the magneto-electric coupling in these materials which is essential to the magnetic and electric field control of electric polarization and magnetization in multiferroic based devices. [1] J. H. Lee, and R. S. Fishman, \underline {http://arxiv.org/abs/1504.07106}
Disciplines
Publication Date
March 17, 2016
Location
Baltimore, MD
Citation Information
Santosh KC, Jun Hee Lee and Valentino R. Cooper. "Understanding the spin-driven polarizations in BiMO3(M=3d transition metals) multiferroics" American Physical Society, APS March Meeting 2016 (2016) Available at: http://works.bepress.com/santosh-kc/49/