Theoretical prediction of multiferroicity in double perovskite Y$_2$NiMnO$_6$

Details Theoretical prediction of multiferroicity in double perovskite Y$_2$NiMnO$_6$ Theoretical prediction of multiferroicity in double perovskite Y$_2$NiMnO$_6$

2009-09-08

arxiv.org/abs/0909.1439v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

We put forward double perovskites of the R$_2$NiMnO$_6$ family (with $R$ a rare-earth atom) as a new class of multiferroics on the basis of {\it ab initio} density functional calculations. We show that changing $R$ from La to Y drives the ground-state from ferromagnetic to antiferromagnetic with $\uparrow\uparrow\downarrow\downarrow$ spin patterns. This E$^*$-type ordering breaks inversion symmetry and generates a ferroelectric polarization of few $\mu C/cm^2$. By analyzing a model Hamiltonian we understand the microscopic origin of this transition and show that an external electric field can be used to tune the transition, thus allowing electrical control of the magnetization.

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