Reversible Non-Volatile Electronic Switching in a Near Room Temperature van der Waals Ferromagnet
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Wu, Han Chen, Lei Malinowski, Paul Huang, Jianwei Deng, Qinwen Scott, Kirsty Jang, Bo Gyu Ruff, Jacob P. C. He, Yu Chen, Xiang Hu, Chaowei Yue, Ziqin Oh, Ji Seop Teng, Xiaokun Guo, Yucheng Klemm, Mason Shi, Chuqiao Shi, Yue Setty, Chandan Werner, Tyler Hashimoto, Makoto Lu, Donghui Yilmaz, T. Vescovo, Elio Mo, Sung-Kwan Fedorov, Alexei Denlinger, Jonathan Xie, Yaofeng Gao, Bin Kono, Junichiro Dai, Pengcheng Han, Yimo Xu, Xiaodong Birgeneau, Robert J. Zhu, Jian-Xin Neto, Eduardo H. da Silva Wu, Liang Chu, Jiun-Haw Si, Qimiao Yi, Ming |
| author_facet | Wu, Han Chen, Lei Malinowski, Paul Huang, Jianwei Deng, Qinwen Scott, Kirsty Jang, Bo Gyu Ruff, Jacob P. C. He, Yu Chen, Xiang Hu, Chaowei Yue, Ziqin Oh, Ji Seop Teng, Xiaokun Guo, Yucheng Klemm, Mason Shi, Chuqiao Shi, Yue Setty, Chandan Werner, Tyler Hashimoto, Makoto Lu, Donghui Yilmaz, T. Vescovo, Elio Mo, Sung-Kwan Fedorov, Alexei Denlinger, Jonathan Xie, Yaofeng Gao, Bin Kono, Junichiro Dai, Pengcheng Han, Yimo Xu, Xiaodong Birgeneau, Robert J. Zhu, Jian-Xin Neto, Eduardo H. da Silva Wu, Liang Chu, Jiun-Haw Si, Qimiao Yi, Ming |
| contents | The ability to reversibly toggle between two distinct states in a non-volatile method is important for information storage applications. Such devices have been realized for phase-change materials, which utilizes local heating methods to toggle between a crystalline and an amorphous state with distinct electrical properties. To expand such kind of switching between two topologically distinct phases requires non-volatile switching between two crystalline phases with distinct symmetries. Here we report the observation of reversible and non-volatile switching between two stable and closely-related crystal structures with remarkably distinct electronic structures in the near room temperature van der Waals ferromagnet Fe$_{5-δ}$GeTe$_2$. From a combination of characterization techniques we show that the switching is enabled by the ordering and disordering of an Fe site vacancy that results in distinct crystalline symmetries of the two phases that can be controlled by a thermal annealing and quenching method. Furthermore, from symmetry analysis as well as first principle calculations, we provide understanding of the key distinction in the observed electronic structures of the two phases: topological nodal lines compatible with the preserved global inversion symmetry in the site-disordered phase, and flat bands resulting from quantum destructive interference on a bipartite crystaline lattice formed by the presence of the site order as well as the lifting of the topological degeneracy due to the broken inversion symmetry in the site-ordered phase. Our work not only reveals a rich variety of quantum phases emergent in the metallic van der Waals ferromagnets due to the presence of site ordering, but also demonstrates the potential of these highly tunable two-dimensional magnets for memory and spintronics applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_03154 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Reversible Non-Volatile Electronic Switching in a Near Room Temperature van der Waals Ferromagnet Wu, Han Chen, Lei Malinowski, Paul Huang, Jianwei Deng, Qinwen Scott, Kirsty Jang, Bo Gyu Ruff, Jacob P. C. He, Yu Chen, Xiang Hu, Chaowei Yue, Ziqin Oh, Ji Seop Teng, Xiaokun Guo, Yucheng Klemm, Mason Shi, Chuqiao Shi, Yue Setty, Chandan Werner, Tyler Hashimoto, Makoto Lu, Donghui Yilmaz, T. Vescovo, Elio Mo, Sung-Kwan Fedorov, Alexei Denlinger, Jonathan Xie, Yaofeng Gao, Bin Kono, Junichiro Dai, Pengcheng Han, Yimo Xu, Xiaodong Birgeneau, Robert J. Zhu, Jian-Xin Neto, Eduardo H. da Silva Wu, Liang Chu, Jiun-Haw Si, Qimiao Yi, Ming Strongly Correlated Electrons Materials Science The ability to reversibly toggle between two distinct states in a non-volatile method is important for information storage applications. Such devices have been realized for phase-change materials, which utilizes local heating methods to toggle between a crystalline and an amorphous state with distinct electrical properties. To expand such kind of switching between two topologically distinct phases requires non-volatile switching between two crystalline phases with distinct symmetries. Here we report the observation of reversible and non-volatile switching between two stable and closely-related crystal structures with remarkably distinct electronic structures in the near room temperature van der Waals ferromagnet Fe$_{5-δ}$GeTe$_2$. From a combination of characterization techniques we show that the switching is enabled by the ordering and disordering of an Fe site vacancy that results in distinct crystalline symmetries of the two phases that can be controlled by a thermal annealing and quenching method. Furthermore, from symmetry analysis as well as first principle calculations, we provide understanding of the key distinction in the observed electronic structures of the two phases: topological nodal lines compatible with the preserved global inversion symmetry in the site-disordered phase, and flat bands resulting from quantum destructive interference on a bipartite crystaline lattice formed by the presence of the site order as well as the lifting of the topological degeneracy due to the broken inversion symmetry in the site-ordered phase. Our work not only reveals a rich variety of quantum phases emergent in the metallic van der Waals ferromagnets due to the presence of site ordering, but also demonstrates the potential of these highly tunable two-dimensional magnets for memory and spintronics applications. |
| title | Reversible Non-Volatile Electronic Switching in a Near Room Temperature van der Waals Ferromagnet |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2307.03154 |