具有大垂直磁各向异性的铁磁体的自旋轨道力矩（SOT）磁化翻转在下一代非易失性磁阻随机存取存储器（MRAM）中具有巨大的潜力。这就需要一个高性能的纯自旋电流源，具有大的自旋霍尔角和高的电导率，这可以通过大规模生产技术制造。在这项工作中，我们证明了高效和强大的SOT磁化开关在所有溅射的BiSb拓扑绝缘体垂直磁化Co/Pt多层膜。尽管通过工业友好的磁控溅射而不是实验室分子束外延来制造，但是拓扑绝缘体层BiSb显示出$θ$ $_{SH}$ = 12.3的大自旋霍尔角和$σ$ = 1.5 x $10^5$ $Ω^{-1}$ m $^{-1}$的高电导率。我们的研究结果证明了BiSb拓扑绝缘体用于实现超低功耗SOT-MRAM和其他基于SOI的自旋电子器件的大规模生产能力。
英文摘要：
Spin-orbit torque (SOT) magnetization switching of ferromagnets with large perpendicular magnetic anisotropy has a great potential for the next-generation non-volatile magnetoresistive random-access memory (MRAM). It requires a high-performance pure spin current source with a large spin Hall angle and high electrical conductivity, which can be fabricated by a mass production technique. In this work, we demonstrate ultrahigh efficient and robust SOT magnetization switching in all-sputtered BiSb topological insulator - perpendicularly magnetized Co/Pt multilayers. Despite fabricated by the industry-friendly magnetron sputtering instead of the laboratory molecular beam epitaxy, the topological insulator layer, BiSb, shows a large spin Hall angle of $θ$$_{SH}$ = 12.3 and high electrical conductivity of $σ$ = 1.5x$10^5$ $Ω^{-1}$m$^{-1}$. Our results demonstrate the mass production capability of BiSb topological insulator for implementation of ultralow power SOT-MRAM and other SOT-based spintronic devices.
Effects of Crystalline Disorder on Interfacial and Magnetic Properties of Sputtered Topological Insulator/Ferromagnet Heterostructures
由拓扑绝缘体和铁磁体组成的薄膜是高能效自旋电子学器件的理想选择。在这里，TI的晶体结构无序的界面和磁性能的溅射沉积的TI/FM，Bi 2 Te 3/Ni 80 Fe 20，异质结的影响进行了报道。发现Ni和少量Fe从Py扩散穿过界面并与Bi 2 Te 3反应。对于高度结晶的c轴取向的Bi 2 Te 3薄膜，吉尔伯特阻尼的巨大增强被观察到，伴随着有效的面外磁各向异性和增强的阻尼样自旋轨道扭矩（DL-SOT），可能是由于拓扑表面状态（TSS）的Bi 2 Te 3。此外，在低温下的磁滞回线测量中观察到自发交换偏置。这是由于扩散的Ni与Bi_2 Te_3反应形成的反铁磁拓扑界面层与FM，Ni_（80）Fe_（20）耦合。随着Bi_2Te_3无序度的增加，AFM界面层中的交换相互作用明显减弱。
Modulating Spin Current Induced Effective Damping in $β-W/Py$ Heterostructures by a Systematic Variation in Resistivity of the Sputtered Deposited $β-W$ films
Comment on "Spin-orbit coupling induced ultrahigh-harmonic generation from magnetic dynamics" with prescriptions on how to validate scientific software for computational quantum transport
