Probing the Néel order in altermagnetic RuO2 films by X-ray magnetic linear dichroism
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910759250821120 |
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| author | Zhang, Yi-Chi Bai, Hua Chen, Chong Han, Lei Liang, Shi-Xuan Chu, Rui-Yue Dai, Jian-Kun Pan, Feng Song, Cheng |
| author_facet | Zhang, Yi-Chi Bai, Hua Chen, Chong Han, Lei Liang, Shi-Xuan Chu, Rui-Yue Dai, Jian-Kun Pan, Feng Song, Cheng |
| contents | The emerging altermagnetic RuO2 with both compensated magnetic moments and broken time-reversal symmetry possesses nontrivial magneto-electronic responses and nonrelativistic spin currents, which are closely related to magnetic easy axis. To probe the Néel order in RuO2, we conducted Ru M3-edge X-ray magnetic linear dichroism (XMLD) measurement. For epitaxial RuO2 films, characteristic XMLD signals can be observed in either RuO2(100) and RuO2(110) at normal incidence or RuO2(001) at oblique incidence, and the signals disappear when test temperature exceeds Néel temperature. For nonepitaxial RuO2 films, the flat lines in the XMLD patterns of RuO2(100) and RuO2(110) demonstrate that there is no in-plane uniaxial alignment of Néel order in these samples, due to the counterbalanced Néel order of the twin crystals evidenced by X-ray diffraction phi-scan measurements. Our experimental results unambiguously demonstrate the antiferromagnetism in RuO2 films and reveal the spatial relation of Néel order to be parallel with RuO2 [001] crystalline axis. These research findings would deepen our understanding of RuO2 and other attractive altermagnetic materials applied in the field of spintronics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_17016 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing the Néel order in altermagnetic RuO2 films by X-ray magnetic linear dichroism Zhang, Yi-Chi Bai, Hua Chen, Chong Han, Lei Liang, Shi-Xuan Chu, Rui-Yue Dai, Jian-Kun Pan, Feng Song, Cheng Materials Science The emerging altermagnetic RuO2 with both compensated magnetic moments and broken time-reversal symmetry possesses nontrivial magneto-electronic responses and nonrelativistic spin currents, which are closely related to magnetic easy axis. To probe the Néel order in RuO2, we conducted Ru M3-edge X-ray magnetic linear dichroism (XMLD) measurement. For epitaxial RuO2 films, characteristic XMLD signals can be observed in either RuO2(100) and RuO2(110) at normal incidence or RuO2(001) at oblique incidence, and the signals disappear when test temperature exceeds Néel temperature. For nonepitaxial RuO2 films, the flat lines in the XMLD patterns of RuO2(100) and RuO2(110) demonstrate that there is no in-plane uniaxial alignment of Néel order in these samples, due to the counterbalanced Néel order of the twin crystals evidenced by X-ray diffraction phi-scan measurements. Our experimental results unambiguously demonstrate the antiferromagnetism in RuO2 films and reveal the spatial relation of Néel order to be parallel with RuO2 [001] crystalline axis. These research findings would deepen our understanding of RuO2 and other attractive altermagnetic materials applied in the field of spintronics. |
| title | Probing the Néel order in altermagnetic RuO2 films by X-ray magnetic linear dichroism |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.17016 |