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Recently, the electric control of magnetism by means of ion migration has been proven to be effective with nonvolatility and low energy consumption. In this work, we investigated the control of the magnetic properties of FeRh films by means of Li+ migration in FeRh/MgO heterostructures. We found that the migration of Li+ could reduce the phase transition temperature by 2 K with an applied voltage of 1 V. Meanwhile, the voltage-dependent saturated magnetization exhibited a repetitive switching behavior from high to low magnetization values while the voltage was switched from 4 to −4 V, indicating that the migration of Li+ in the FeRh film can be reversible. This provides a means to control the magnetic properties of FeRh films.

Electric Field Control of Magnetic Properties by Means of Li+ Migration in FeRh Thin Film