Disorder-broadened topological Hall phase and anomalous Hall scaling in FeGe
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914142339727360 |
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| author | Gupta, Chaman Matsumura, Chris Yang, Hongbin Edwards, Sarah Gurrola, Rebeca M. Chu, Jiun-Haw Paik, Hanjong Wang, Yongqiang Muller, David A. Streubel, Robert Lu, Tzu-Ming Eley, Serena |
| author_facet | Gupta, Chaman Matsumura, Chris Yang, Hongbin Edwards, Sarah Gurrola, Rebeca M. Chu, Jiun-Haw Paik, Hanjong Wang, Yongqiang Muller, David A. Streubel, Robert Lu, Tzu-Ming Eley, Serena |
| contents | Magnetic skyrmions are topologically protected spin textures that are promising candidates for low-power spintronic memory and logic devices. Realizing skyrmion-based devices requires an understanding of how structural disorder affects their stability and transport properties. This study uses Ne$^{+}$ ion irradiation at fluences from $10^{11}$ to $10^{14}$ ions-cm$^{-2}$ to systematically vary defect densities in 80 nm epitaxial FeGe films and quantify the resulting modifications to magnetic phase boundaries and electronic scattering. Temperature- and field-dependent Hall measurements reveal that increasing disorder progressively extends the topological Hall signal from a narrow window near 200K in pristine films down to 4K at the highest fluence, with peak amplitude more than doubling. Simultaneously, the anomalous Hall effect transitions from quadratic Berry curvature scaling to linear skew scattering behavior, with the skew coefficient increasing threefold. These results establish quantitative correlations between defect concentration, skyrmion phase space, and transport mechanisms in a chiral magnet. It demonstrates that ion-beam modification provides systematic control over both topological texture stability and electrical detectability. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_05008 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Disorder-broadened topological Hall phase and anomalous Hall scaling in FeGe Gupta, Chaman Matsumura, Chris Yang, Hongbin Edwards, Sarah Gurrola, Rebeca M. Chu, Jiun-Haw Paik, Hanjong Wang, Yongqiang Muller, David A. Streubel, Robert Lu, Tzu-Ming Eley, Serena Materials Science Mesoscale and Nanoscale Physics Quantum Physics Magnetic skyrmions are topologically protected spin textures that are promising candidates for low-power spintronic memory and logic devices. Realizing skyrmion-based devices requires an understanding of how structural disorder affects their stability and transport properties. This study uses Ne$^{+}$ ion irradiation at fluences from $10^{11}$ to $10^{14}$ ions-cm$^{-2}$ to systematically vary defect densities in 80 nm epitaxial FeGe films and quantify the resulting modifications to magnetic phase boundaries and electronic scattering. Temperature- and field-dependent Hall measurements reveal that increasing disorder progressively extends the topological Hall signal from a narrow window near 200K in pristine films down to 4K at the highest fluence, with peak amplitude more than doubling. Simultaneously, the anomalous Hall effect transitions from quadratic Berry curvature scaling to linear skew scattering behavior, with the skew coefficient increasing threefold. These results establish quantitative correlations between defect concentration, skyrmion phase space, and transport mechanisms in a chiral magnet. It demonstrates that ion-beam modification provides systematic control over both topological texture stability and electrical detectability. |
| title | Disorder-broadened topological Hall phase and anomalous Hall scaling in FeGe |
| topic | Materials Science Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2511.05008 |