Large spin-orbit torque in a-plane $α$-Fe$_{2}$O$_{3}$/Pt bilayers
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910839823400960 |
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| author | Lyalin, Igor Zhang, Hantao Michel, Justin Russell, Daniel Yang, Fengyuan Cheng, Ran Kawakami, Roland K. |
| author_facet | Lyalin, Igor Zhang, Hantao Michel, Justin Russell, Daniel Yang, Fengyuan Cheng, Ran Kawakami, Roland K. |
| contents | Realization of efficient spin-orbit torque switching of the Néel vector in insulating antiferromagnets is a challenge, often complicated by spurious effects. Quantifying the spin-orbit torques in antiferromagnet/heavy metal heterostructures is an important first step towards this goal. Here, we employ magneto-optic techniques to study damping-like spin-orbit torque (DL-SOT) in a-plane $α$-Fe$_2$O$_3$ (hematite) with a Pt spin-orbit overlayer. We find that the DL-SOT efficiency is two orders of magnitude larger than reported in c- and r-plane hematite/Pt using harmonic Hall techniques. The large magnitude of DL-SOT is supported by direct imaging of current-induced motion of antiferromagnetic domains that happens at moderate current densities. Our study introduces a new method for quantifying spin-orbit torque in antiferromagnets with a small canted moment and identifies a-plane $α$-Fe$_2$O$_3$ as a promising candidate to realize efficient SOT switching. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_07731 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Large spin-orbit torque in a-plane $α$-Fe$_{2}$O$_{3}$/Pt bilayers Lyalin, Igor Zhang, Hantao Michel, Justin Russell, Daniel Yang, Fengyuan Cheng, Ran Kawakami, Roland K. Materials Science Mesoscale and Nanoscale Physics Realization of efficient spin-orbit torque switching of the Néel vector in insulating antiferromagnets is a challenge, often complicated by spurious effects. Quantifying the spin-orbit torques in antiferromagnet/heavy metal heterostructures is an important first step towards this goal. Here, we employ magneto-optic techniques to study damping-like spin-orbit torque (DL-SOT) in a-plane $α$-Fe$_2$O$_3$ (hematite) with a Pt spin-orbit overlayer. We find that the DL-SOT efficiency is two orders of magnitude larger than reported in c- and r-plane hematite/Pt using harmonic Hall techniques. The large magnitude of DL-SOT is supported by direct imaging of current-induced motion of antiferromagnetic domains that happens at moderate current densities. Our study introduces a new method for quantifying spin-orbit torque in antiferromagnets with a small canted moment and identifies a-plane $α$-Fe$_2$O$_3$ as a promising candidate to realize efficient SOT switching. |
| title | Large spin-orbit torque in a-plane $α$-Fe$_{2}$O$_{3}$/Pt bilayers |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2407.07731 |