Spin Polarization Compensation in Ferrimagnetic Co1-xTbx/Pt Bilayers Revealed by Spin Hall Magnetoresistance
Spin Polarization Compensation in Ferrimagnetic Co1-xTbx/Pt Bilayers Revealed by Spin Hall Magnetoresistance
复制标题
自旋霍尔磁阻揭示了亚铁磁 Co1–xTbx/Pt 双层中的自旋极化补偿
DOI：
10.1103/physrevapplied.14.034064
复制
发表时间：
2020
影响因子：
4.6
通讯作者：
Zhao Jianhua
中科院分区：
文献类型：
--
作者：
Xu Yaohan;Chen Dongdong;Tong Shucheng;Chen Huanjian;Qiu Xuepeng;Wei Dahai;Zhao Jianhua
稀土过渡金属（RETM）亚铁磁体因其磁矩小和动力学快而在下一代自旋电子器件的开发中受到了极大的关注。在这里，我们研究了 RETM 亚铁磁体和重金属双层中的自旋霍尔磁阻 (SMR)。观察到 SMR 的异常温度依赖性，其中 SMR 非单调变化，并且在磁化补偿温度附近有一个谷值。此外，我们发现合金的不同化学成分的 SMR 差异很大。这些异常行为被解释为补偿点附近层的自旋极化发生了显着改变。通过从 SMR 的异常温度依赖性推导出自旋极化，我们提供了一种获取 RETM 亚铁磁体自旋极化的便捷方法。这些实验结果表明了 RETM 亚铁磁体可调谐自旋电流源的意义。
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. 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 ofalloys. These anomalous behaviors are interpreted as the dramatically altered spin polarization of thelayer 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.