Influence of Metal Interlayers on Spin-Charge Conversion in Sb2Te3 Topological Insulator-Based Devices

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-04-18 DOI:10.1021/acs.nanolett.4c06658

Emanuele Longo, Matteo Belli, Claudia Wiemer, Alessio Lamperti, Andrey V. Matetskiy, Polina M. Shevedyaeva, Paolo Moras, Marco Fanciulli, Roberto Mantovan

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Abstract

The magnetization of a ferromagnetic layer can be controlled via spin-charge conversion (SCC) phenomena originating in an adjacent topological insulator (TI). Insertion of nonmagnetic interlayers between these materials has been demonstrated to enhance the SCC efficiency, as shown for Sb₂Te₃/Au/Co(Fe) heterostructures. The inert nature of the Sb₂Te₃/Au interface was assumed to preserve the topological surface state (TSS) of Sb₂Te₃, which mediates the SCC. Al is explored as an alternative to Au for its long spin diffusion length. Spin pumping experiments indicate the absence of SCC in the Sb₂Te₃/Al/Co heterostructure. Core level and valence band photoemission spectroscopies reveal that Al forms stable compounds with Te and Sb, thereby quenching the TSS of Sb₂Te₃, while the TSS is preserved upon the formation of the TI/Au interface. These results demonstrate directly the major influence of material chemistry and highlight the role of TSS on the SCC efficiency in TI-based devices.

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金属夹层对基于 Sb2Te3 拓扑绝缘体器件中自旋电荷转换的影响

铁磁层的磁化可以通过邻近拓扑绝缘体（TI）产生的自旋电荷转换（SCC）现象来控制。对于Sb2Te3/Au/Co（Fe）异质结构，在这些材料之间插入非磁性中间层已被证明可以提高SCC效率。假设Sb2Te3/Au界面的惰性性质可以保持Sb2Te3的拓扑表面态（TSS），从而介导SCC。Al因其较长的自旋扩散长度而被探索作为Au的替代品。自旋抽运实验表明Sb2Te3/Al/Co异质结构中不存在SCC。核能级和价带光发射光谱显示，Al与Te和Sb形成稳定的化合物，从而使Sb2Te3的TSS猝灭，而TSS在TI/Au界面形成后被保留。这些结果直接证明了材料化学的主要影响，并突出了TSS对ti基器件中SCC效率的作用。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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