Author(s): Xu, YH (Xu, Yaohan); Chen, DD (Chen, Dongdong); Tong, SC (Tong, Shucheng); Chen, HJ (Chen, Huanjian); Qiu, XP (Qiu, Xuepeng); Wei, DH (Wei, Dahai); Zhao, JH (Zhao, Jianhua)

Source: PHYSICAL REVIEW APPLIED Volume: 14 Issue: 3 Article Number: 034064 DOI: 10.1103/PhysRevApplied.14.034064 Published: SEP 25 2020

Abstract: Rare-earth-transition-metal (RETM) ferrimagnets have received great attention for their small magnetic moments and fast dynamics in the development of next-generation spintronic devices. Here, we study spin Hall magnetoresistance (SMR) in the RETM ferrimagnet and heavy-metal bilayers of Co1-xTbx/Pt. Anomalous temperature dependence of the SMR is observed, where the SMR changes nonmonotonically and has a valley next to the magnetization compensation temperature. Additionally, we find that the SMR varies significantly for different chemical compositions of Co1-xTbx alloys. These anomalous behaviors are interpreted as the dramatically altered spin polarization of the Co1-xTbx layer near the compensation point. By deducing spin polarization from the abnormal temperature dependence of SMR, we provide a convenient way to access spin polarization of the RETM ferrimagnets. These experimental results show implications for tunable spin-current sources of RETM ferrimagnets.

Accession Number: WOS:000575943900003

ISSN: 2331-7019

Full Text: https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.14.034064