Multi-rotational switching in a noncollinear antiferromagnet by spin-orbit torque
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913140438990848 |
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| author | Sato, Yuma Takeuchi, Yutaro Yamane, Yuta Kanai, Shun Fukami, Shunsuke |
| author_facet | Sato, Yuma Takeuchi, Yutaro Yamane, Yuta Kanai, Shun Fukami, Shunsuke |
| contents | Spintronics has advanced through discoveries of various electrically-driven spin dynamics in nanomagnets. Here, we report a novel switching dynamics of spin systems driven by spin-orbit torque, using a noncollinear antiferromagnetic nanodot. With electric pulses spanning a wide range of durations and amplitudes, we find an unconventional insensitivity of a threshold current density to pulse duration in switch-back events. This observation is attributed to a previously unrecognized process, in which the noncollinear antiferromagnetic order undergoes multiple rotations before completing reversal, a phenomenon we term multi-rotational switching. Our theoretical analysis reveals that multi-rotational switching arises from the interplay of three key factors: current-driven coherent rotation of the noncollinear antiferromagnetic order, field-induced reorientation of the uncompensated net magnetization, and thermal fluctuations. These findings establish a microscopic mechanism governing current-induced switching in noncollinear antiferromagnets, a topic of growing interest for next-generation spintronics technologies, opening a new route to controlling antiferromagnetic order in nanodevices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18009 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Multi-rotational switching in a noncollinear antiferromagnet by spin-orbit torque Sato, Yuma Takeuchi, Yutaro Yamane, Yuta Kanai, Shun Fukami, Shunsuke Mesoscale and Nanoscale Physics Spintronics has advanced through discoveries of various electrically-driven spin dynamics in nanomagnets. Here, we report a novel switching dynamics of spin systems driven by spin-orbit torque, using a noncollinear antiferromagnetic nanodot. With electric pulses spanning a wide range of durations and amplitudes, we find an unconventional insensitivity of a threshold current density to pulse duration in switch-back events. This observation is attributed to a previously unrecognized process, in which the noncollinear antiferromagnetic order undergoes multiple rotations before completing reversal, a phenomenon we term multi-rotational switching. Our theoretical analysis reveals that multi-rotational switching arises from the interplay of three key factors: current-driven coherent rotation of the noncollinear antiferromagnetic order, field-induced reorientation of the uncompensated net magnetization, and thermal fluctuations. These findings establish a microscopic mechanism governing current-induced switching in noncollinear antiferromagnets, a topic of growing interest for next-generation spintronics technologies, opening a new route to controlling antiferromagnetic order in nanodevices. |
| title | Multi-rotational switching in a noncollinear antiferromagnet by spin-orbit torque |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.18009 |