All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface
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 in...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-10-01
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| Series: | NPG Asia Materials |
| Online Access: | https://doi.org/10.1038/s41427-023-00504-w |
| _version_ | 1827327090635046912 |
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| author | Suchetana Mukhopadhyay Pratap Kumar Pal Subhadeep Manna Chiranjib Mitra Anjan Barman |
| author_facet | Suchetana Mukhopadhyay Pratap Kumar Pal Subhadeep Manna Chiranjib Mitra Anjan Barman |
| author_sort | Suchetana Mukhopadhyay |
| collection | DOAJ |
| description | 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/BiSbTe1.5Se1.5(BSTS)/Co20Fe60B20(CoFeB)/SiO2 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. |
| first_indexed | 2024-03-07T14:55:02Z |
| format | Article |
| id | doaj.art-f5fea845cf9d42e38f1ccf86407dfaff |
| institution | Directory Open Access Journal |
| issn | 1884-4057 |
| language | English |
| last_indexed | 2024-03-07T14:55:02Z |
| publishDate | 2023-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | NPG Asia Materials |
| spelling | doaj.art-f5fea845cf9d42e38f1ccf86407dfaff2024-03-05T19:29:36ZengNature PortfolioNPG Asia Materials1884-40572023-10-0115111210.1038/s41427-023-00504-wAll-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interfaceSuchetana Mukhopadhyay0Pratap Kumar Pal1Subhadeep Manna2Chiranjib Mitra3Anjan Barman4Department of Condensed Matter and Materials Physics, S.N. Bose National Center for Basic Sciences, Block-JDDepartment of Condensed Matter and Materials Physics, S.N. Bose National Center for Basic Sciences, Block-JDDepartment of Physical Sciences, Indian Institute of Science Education and ResearchDepartment of Physical Sciences, Indian Institute of Science Education and ResearchDepartment of Condensed Matter and Materials Physics, S.N. Bose National Center for Basic Sciences, Block-JDAbstract 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/BiSbTe1.5Se1.5(BSTS)/Co20Fe60B20(CoFeB)/SiO2 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.https://doi.org/10.1038/s41427-023-00504-w |
| spellingShingle | Suchetana Mukhopadhyay Pratap Kumar Pal Subhadeep Manna Chiranjib Mitra Anjan Barman All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface NPG Asia Materials |
| title | All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface |
| title_full | All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface |
| title_fullStr | All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface |
| title_full_unstemmed | All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface |
| title_short | All-optical observation of giant spin transparency at the topological insulator BiSbTe1.5Se1.5/Co20Fe60B20 interface |
| title_sort | all optical observation of giant spin transparency at the topological insulator bisbte1 5se1 5 co20fe60b20 interface |
| url | https://doi.org/10.1038/s41427-023-00504-w |
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