All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface

IF 8.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Npg Asia Materials Pub Date : 2023-10-20 DOI:10.1038/s41427-023-00504-w

Suchetana Mukhopadhyay, Pratap Kumar Pal, Subhadeep Manna, Chiranjib Mitra, Anjan Barman

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引用次数: 1

Abstract

Abstract The rise of three-dimensional topological insulators as an attractive playground for the observation and control of various spin-orbit effects has ushered in the field of topological spintronics. To fully exploit their potential as efficient spin-orbit torque generators, it is crucial to investigate the efficiency of spin injection and transport at various topological insulator/ferromagnet interfaces, as characterized by their spin-mixing conductances and interfacial spin transparencies. Here, we use all-optical time-resolved magneto-optical Kerr effect magnetometry to demonstrate efficient room-temperature spin pumping in Sub/BiSbTe 1.5 Se 1.5 (BSTS)/Co 20 Fe 60 B 20 (CoFeB)/SiO 2 thin films. From the modulation of Gilbert damping with BSTS and CoFeB thicknesses, the spin-mixing conductances of the BSTS/CoFeB interface and the spin diffusion length in BSTS are determined. For BSTS thicknesses far exceeding the spin diffusion length, in the so-called “perfect spin sink” regime, we obtain an interfacial spin transparency as high as 0.9, promoting such systems as scintillating candidates for spin-orbitronic devices.

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拓扑绝缘体bisbte1.5 . se1.5 /Co20Fe60B20界面巨型自旋透明的全光学观察

三维拓扑绝缘体的兴起为观察和控制各种自旋轨道效应提供了一个有吸引力的平台，从而迎来了拓扑自旋电子学领域的发展。为了充分发挥其作为高效自旋轨道转矩发生器的潜力，研究自旋注入和输运在不同拓扑绝缘体/铁磁体界面上的效率是至关重要的，其特征是自旋混合电导和界面自旋透明度。在这里，我们使用全光时间分辨磁光克尔效应磁强计来证明在Sub/BiSbTe 1.5 Se 1.5 (BSTS)/Co 20 Fe 60 b20 (CoFeB)/ sio2薄膜中有效的室温自旋泵浦。通过BSTS和CoFeB厚度对Gilbert阻尼的调制，确定了BSTS/CoFeB界面的自旋混合电导和BSTS中的自旋扩散长度。当BSTS厚度远远超过自旋扩散长度时，在所谓的“完美自旋汇”机制下，我们获得了高达0.9的界面自旋透明度，促进了该系统成为自旋轨道电子器件的闪烁候点。

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来源期刊

Npg Asia Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

15.40

自引率

1.00%

发文量

审稿时长

2 months

期刊介绍： NPG Asia Materials is an open access, international journal that publishes peer-reviewed review and primary research articles in the field of materials sciences. The journal has a global outlook and reach, with a base in the Asia-Pacific region to reflect the significant and growing output of materials research from this area. The target audience for NPG Asia Materials is scientists and researchers involved in materials research, covering a wide range of disciplines including physical and chemical sciences, biotechnology, and nanotechnology. The journal particularly welcomes high-quality articles from rapidly advancing areas that bridge the gap between materials science and engineering, as well as the classical disciplines of physics, chemistry, and biology. NPG Asia Materials is abstracted/indexed in Journal Citation Reports/Science Edition Web of Knowledge, Google Scholar, Chemical Abstract Services, Scopus, Ulrichsweb (ProQuest), and Scirus.