Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909220678402048 |
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| author | Tschirner, Teresa Keßler, Philipp Betancourt, Ruben Dario Gonzalez Kotte, Tommy Kriegner, Dominik Buechner, Bernd Dufouleur, Joseph Kamp, Martin Jovic, Vedran Smejkal, Libor Sinova, Jairo Claessen, Ralph Jungwirth, Tomas Moser, Simon Reichlova, Helena Veyrat, Louis |
| author_facet | Tschirner, Teresa Keßler, Philipp Betancourt, Ruben Dario Gonzalez Kotte, Tommy Kriegner, Dominik Buechner, Bernd Dufouleur, Joseph Kamp, Martin Jovic, Vedran Smejkal, Libor Sinova, Jairo Claessen, Ralph Jungwirth, Tomas Moser, Simon Reichlova, Helena Veyrat, Louis |
| contents | Observations of the anomalous Hall effect in RuO$_2$ and MnTe have demonstrated unconventional time-reversal symmetry breaking in the electronic structure of a recently identified new class of compensated collinear magnets, dubbed altermagnets. While in MnTe the unconventional anomalous Hall signal accompanied by a vanishing magnetization is observable at remanence, the anomalous Hall effect in RuO$_2$ is excluded by symmetry for the Néel vector pointing along the zero-field [001] easy-axis. Guided by a symmetry analysis and ab initio calculations, a field-induced reorientation of the Néel vector from the easy-axis towards the [110] hard-axis was used to demonstrate the anomalous Hall signal in this altermagnet. We confirm the existence of an anomalous Hall effect in our RuO$_2$ thin-film samples whose set of magnetic and magneto-transport characteristics is consistent with the earlier report. By performing our measurements at extreme magnetic fields up to 68 T, we reach saturation of the anomalous Hall signal at a field $H_{\rm c} \simeq$ 55 T that was inaccessible in earlier studies, but is consistent with the expected Néel-vector reorientation field. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_00568 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2 Tschirner, Teresa Keßler, Philipp Betancourt, Ruben Dario Gonzalez Kotte, Tommy Kriegner, Dominik Buechner, Bernd Dufouleur, Joseph Kamp, Martin Jovic, Vedran Smejkal, Libor Sinova, Jairo Claessen, Ralph Jungwirth, Tomas Moser, Simon Reichlova, Helena Veyrat, Louis Mesoscale and Nanoscale Physics Observations of the anomalous Hall effect in RuO$_2$ and MnTe have demonstrated unconventional time-reversal symmetry breaking in the electronic structure of a recently identified new class of compensated collinear magnets, dubbed altermagnets. While in MnTe the unconventional anomalous Hall signal accompanied by a vanishing magnetization is observable at remanence, the anomalous Hall effect in RuO$_2$ is excluded by symmetry for the Néel vector pointing along the zero-field [001] easy-axis. Guided by a symmetry analysis and ab initio calculations, a field-induced reorientation of the Néel vector from the easy-axis towards the [110] hard-axis was used to demonstrate the anomalous Hall signal in this altermagnet. We confirm the existence of an anomalous Hall effect in our RuO$_2$ thin-film samples whose set of magnetic and magneto-transport characteristics is consistent with the earlier report. By performing our measurements at extreme magnetic fields up to 68 T, we reach saturation of the anomalous Hall signal at a field $H_{\rm c} \simeq$ 55 T that was inaccessible in earlier studies, but is consistent with the expected Néel-vector reorientation field. |
| title | Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2 |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2309.00568 |