Spin homojunction with high interfacial transparency for efficient spin-charge conversion
Lei Han, Yuyan Wang, Wenxuan Zhu, Runni Zhao, Xianzhe Chen, Rongxuan Su, Yongjian Zhou, Hua Bai, Qian Wang, Yunfeng You, Chong Chen, Sen Yan, Tongjin Chen, Yongzheng Wen, Cheng Song, Feng Pan
Abstract
High interfacial transparency is vital to achieve efficient spin-charge conversion for ideal spintronic devices with low energy consumption. However, in traditional ferromagnetic/nonmagnetic heterojunctions, the interfacial Rashba spin-orbit coupling brings about spin memory loss (SML) and two-magnon scattering (TMS), quenching spin current crossing the heterointerfaces. To address the intrinsic deficiency of heterointerface, we design a ferromagnetic FeRh/antiferromagnetic FeRh spin homojunction for efficient spin-charge conversion, verified by a high interfacial transparency of 0.75 and a high spin torque efficiency of 0.34 from spin pumping measurements. First-principles calculations demonstrate that the interfacial electric field of homojunction is two orders of magnitude smaller than that of traditional heterojunction, producing negligible interfacial spin-orbit coupling to drastically reduce SML and TMS. Our spin homojunction exhibits potential and enlightenment for future energy-efficient spintronic devices.