Characterizing Spin-Orbit Torques by Tensorial Spin Hall Magnetoresistance
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912813030572032 |
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| author | Zhang, Hantao Cheng, Ran |
| author_facet | Zhang, Hantao Cheng, Ran |
| contents | Magnetoresistance (MR) provides a crucial tool for experimentally studying spin torques. While MR is well established in the device geometry of the spin Hall effect (SHE), as exemplified by the magnet/heavy-metal heterostructures, its role and manifestation beyond the SHE paradigm remain elusive. We propose a hitherto unknown form of MR where the underlying charge-to-spin conversion and its inverse process violate the simple geometry of the SHE, calling for tensorial descriptions. This MR can generate a series of unique harmonic responses essential for the experimental characterization of unconventional spin-orbit torques in non-SHE materials. We demonstrate these harmonic signals with semimetal WTe$_2$ in mind but the results are not restricted to specific materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_15930 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Characterizing Spin-Orbit Torques by Tensorial Spin Hall Magnetoresistance Zhang, Hantao Cheng, Ran Mesoscale and Nanoscale Physics Materials Science Other Condensed Matter Magnetoresistance (MR) provides a crucial tool for experimentally studying spin torques. While MR is well established in the device geometry of the spin Hall effect (SHE), as exemplified by the magnet/heavy-metal heterostructures, its role and manifestation beyond the SHE paradigm remain elusive. We propose a hitherto unknown form of MR where the underlying charge-to-spin conversion and its inverse process violate the simple geometry of the SHE, calling for tensorial descriptions. This MR can generate a series of unique harmonic responses essential for the experimental characterization of unconventional spin-orbit torques in non-SHE materials. We demonstrate these harmonic signals with semimetal WTe$_2$ in mind but the results are not restricted to specific materials. |
| title | Characterizing Spin-Orbit Torques by Tensorial Spin Hall Magnetoresistance |
| topic | Mesoscale and Nanoscale Physics Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2506.15930 |