The first-order magnetic phase transition between antiferromagnetic (AFM) and ferromagnetic (FM) states around room temperature is one of the unique features in FeRh. More fascinating is that the phase-transition temperature (T tr) can be readily modulated by the magnetic field. In this work, a spin current valve is isothermally demonstrated by electrically and thermally probing the spin channel during the phase transition. When switching between the AFM and FM states, a large magnetoresistance ratio of 50% is obtained. Meanwhile, the on/off ratio for the magnetospin-polarized thermal voltage associated with the magnonic spin current can be nearly infinite. It is shown that the significantly modulated T tr and switching critical field in FeRh advance its potential applications for the spin current switch devices.
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