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Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure
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Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure
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Journal Article
Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure
2014
Overview
The recent research on multiferroics has provided solid evidence that the breaking of inversion symmetry by spin order can induce ferroelectric polarization
P
. This type of multiferroics, called spin-driven ferroelectrics, often show a gigantic change in
P
on application of a magnetic field
B
. However, their polarization (<~0.1 μC cm
−2
) is much smaller than that in conventional ferroelectrics (typically several to several tens of μC cm
−2
). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO
3
, causes a flop of
P
and leads to the highest
P
(≈1.0 μC cm
−2
) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressure-induced magnetoelectric phase transition, based on the results of density functional simulations. In the high-pressure phase, the application of
B
further enhances
P
over 1.8 μC cm
−2
. This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics.
Multiferroics are promising for their simultaneous ferroelectricity and magnetism, although in some of the most promising compounds the ferroelectric polarization remains small. Here, the authors show that applying external pressure to the multiferroic TbMnO
3
leads to a high ferroelectric polarization.
Publisher
Nature Publishing Group UK,Nature Publishing Group
