Observation of Rashba Magnetism in Ultrathin Ferromagnet-Heavy Metal Bilayers
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866929437970268160 |
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| author | Ivanov, Sergei Zhang, Yiou Peacock, Joshua Demidov, Vladislav E. Demokritov, Sergej O. Brookes, Nicholas Wehinger, Bjorn Freeland, John W. Urazhdin, Sergei |
| author_facet | Ivanov, Sergei Zhang, Yiou Peacock, Joshua Demidov, Vladislav E. Demokritov, Sergej O. Brookes, Nicholas Wehinger, Bjorn Freeland, John W. Urazhdin, Sergei |
| contents | Both magnetism and spin-orbit coupling in systems with broken inversion symmetry lift the spin degeneracy of electronic bands, but the consequences of interplay between these mechanisms remain poorly understood. Here, we show that ultrathin transition ferromagnet-heavy metal bilayers exhibit anomalous temperature- and electric bias-dependent behaviors in the vicinity of the Curie temperature, inconsistent with the usual Weiss magnetism. Characterization by several complementary techniques and analysis of the dependence on composition reveal that these effects originate from interfacial spin-orbit interaction, which results in the emergence of a state with distinct magnetic and magnetoelectronic properties that can be described as Rashba magnetism. Our findings open a new route for the characterization and control of spin-orbit phenomena in heterostructures enabling the development of efficient spin-orbitronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_18299 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of Rashba Magnetism in Ultrathin Ferromagnet-Heavy Metal Bilayers Ivanov, Sergei Zhang, Yiou Peacock, Joshua Demidov, Vladislav E. Demokritov, Sergej O. Brookes, Nicholas Wehinger, Bjorn Freeland, John W. Urazhdin, Sergei Materials Science Mesoscale and Nanoscale Physics Both magnetism and spin-orbit coupling in systems with broken inversion symmetry lift the spin degeneracy of electronic bands, but the consequences of interplay between these mechanisms remain poorly understood. Here, we show that ultrathin transition ferromagnet-heavy metal bilayers exhibit anomalous temperature- and electric bias-dependent behaviors in the vicinity of the Curie temperature, inconsistent with the usual Weiss magnetism. Characterization by several complementary techniques and analysis of the dependence on composition reveal that these effects originate from interfacial spin-orbit interaction, which results in the emergence of a state with distinct magnetic and magnetoelectronic properties that can be described as Rashba magnetism. Our findings open a new route for the characterization and control of spin-orbit phenomena in heterostructures enabling the development of efficient spin-orbitronic devices. |
| title | Observation of Rashba Magnetism in Ultrathin Ferromagnet-Heavy Metal Bilayers |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2407.18299 |