Zhang Y.-H., Weng T.-W., Chuang T.-C., Qu D., Huang S.-Y.Weng T.-W., Chuang T.-C., Qu D., Huang S.-Y.Zhang Y.-H.SSU-YEN HUANG2021-07-282021-07-28202025119044https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103798713&doi=10.1002%2fqute.202000059&partnerID=40&md5=7a287819a733e49054b027b9924f2aa9https://scholars.lib.ntu.edu.tw/handle/123456789/574280The 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 (Ttr) 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 Ttr and switching critical field in FeRh advance its potential applications for the spin current switch devices. ? 2020 Wiley-VCH GmbHBinary alloys; Iron alloys; Rhodium alloys; Antiferromagnetic transition; Antiferromagnetics; Critical fields; First-order magnetic phase transitions; Large magnetoresistance ratio; Spin channels; Thermal voltage; Unique features; Antiferromagnetism[SDGs]SDG13journal article10.1002/qute.2020000592-s2.0-85103798713