Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6

G. Sharma; J. Saha; S. Patnaik

doi:10.1063/1.4812728

Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6

Materials Science 2015-06-15 v1 Strongly Correlated Electrons

Authors: 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.

Keywords

multiferroic magnetic structure perovskite magnetism

Cite

@article{arxiv.1303.6921,
  title  = {Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6},
  author = {G. Sharma and J. Saha and S. Patnaik},
  journal= {arXiv preprint arXiv:1303.6921},
  year   = {2015}
}

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