Abstract
We investigated electric control of magnetic properties in FeRh/PMN-PT heterostructures. An electric field of 1 kV/cm applied on the PMN-PT substrate could increase the coercivity of FeRh film from 60 to 161 Oe at 360 K where the FeRh antiferromagnetic to ferromagnetic phase transition occurs. The electric field dependent coercive field reveals a butterfly shape, indicating a strain-mediated magnetoelectric coupling across the FeRh/PMN-PT interface. However, the uniaxial magnetic anisotropy of FeRh is almost unchanged with the applied electric field on the PMN-PT substrate, which suggests the change of coercivity in FeRh films is mainly due to the shift of the magnetic transition temperature under the electric field.
Highlights
The CsCl-type FeRh alloy is antiferromagnetic (AF) at room temperature
We investigated the control of magnetic properties of FeRh films by applying electric field on the ferroelectric (1-x)[Pb(Mg1/3Nb2/3)O3]-x[PbTiO3] (PMN-PT) substrates
The film thicknesses were controlled by the deposition time, which have been calibrated by X-ray reflectivity (XRR)
Summary
The CsCl-type FeRh alloy is antiferromagnetic (AF) at room temperature. It undergoes a peculiar first-order phase transition to ferromagnetic (FM) phase upon heating above 300 K and shows two-phase coexistence near the transition.[1,2,3] Due to the magnetic transition, FeRh in the form of thin films have attracted extensive attentions for its potential application in the spintronic devices, especially in heat assisted magnetic recording.[4,5,6,7,8,9] the high energy cost of the thermally induced magnetic transition is detrimental to the practical application. We investigated the control of magnetic properties of FeRh films by applying electric field on the ferroelectric (1-x)[Pb(Mg1/3Nb2/3)O3]-x[PbTiO3] (PMN-PT) substrates.
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