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arXiv · 1303.6921

Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6

G. Sharma·J. Saha·S. Patnaik
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Abstract

We report multiferroic behavior in double perovskite Y2CoMnO6 with ferroelectric transition temperature Tc = 80K. The origin of ferroelectricity is associated with magnetic ordering of Co2+ and Mn4+ moments in a up-up-down-down arrangement. The saturation polarization and magnetization are estimated to be 65 uC/m2 and 6.2 Bohr magneton/f.u. respectively. The magnetoelectric coupling parameter, on the other hand, is small as a 5 Tesla field suppresses the electric polarization by only ~8%. This is corroborated with observed hysteretic behaviour at 5K that remains unsaturated even upto 7 Tesla. A model based on exchange-striction is proposed to explain the observed high temperature ferroelectricity.

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G. Sharma, J. Saha, S. Patnaik. 2013-03-27. Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6. https://doi.org/10.1063/1.4812728

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