Magnetization dependent spin orbit torques generated by ferrimagnetic FeCoTb alloys
Magnetization dependent spin orbit torques generated by ferrimagnetic FeCoTb alloys
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亚铁磁性 FeCoTb 合金产生的磁化相关自旋轨道扭矩
DOI：
10.1016/j.jallcom.2022.167351
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Zhongming Zeng
中科院分区：
文献类型：
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作者：
Qian Chen;Qingjie Guo;Zhaocong Huang;Bin Fang;Shangkun Li;Weiming Lv;Rongxin Li;Yi Luo;Jun Du;Baoshun Zhang;Ya Zhai;Yaming Fan;Zhongming Zeng
磁性材料产生的自旋轨道扭矩（SOT）引发了人们对低功耗自旋电子学的兴趣激增。在这种情况下，稀土掺杂磁性合金由于其低对称性和大自旋轨道耦合而成为理想的候选者。在这里，我们对坡莫合金 (Ni80Fe20, Py)/Cu/FeCoTb 自旋阀结构中的亚铁磁 FeCoTb 合金产生的 SOT 进行了研究，显示出高效的类阻尼和类场扭矩。至关重要的是，FeCoTb 的自旋霍尔电导率高达 6.32 × 105(ℏ/2e) Ω−1m−1，大于传统重金属的自旋霍尔电导率。通过控制自旋阀结构的磁性配置，实现了 SOT 的磁化依赖行为，这可能源于以 Tb 磁化为主的 FeCoTb 的反常霍尔效应。我们的结果证明了亚铁磁材料在低功率自旋电子应用中的巨大前景。
Spin-orbit torques (SOTs) generated by magnetic materials have prompted a surge of interest in low-power spintronics. In this context, rare-earth doped magnetic alloys are the ideal candidate due to the low symmetry and large spin-orbit coupling. Here, we present a study on SOTs generated by ferrimagnetic FeCoTb alloys in permalloy (Ni80Fe20, Py)/Cu/FeCoTb spin valve structures, showing high-efficient damping-like and field-like torques. Crucially, the spin Hall conductivity of FeCoTb is up to 6.32 × 105(ℏ/2e) Ω−1m−1, larger than that in conventional heavy metals. By controlling the magnetic configuration of the spin valve structure, the magnetization dependent behavior of the SOTs is achieved, which may origin from the anomalous Hall effect of FeCoTb dominated by Tb magnetization. Our results demonstrate great prospects of ferrimagnetic materials for low-power spintronic applications.