Surface Magnetism in Fe$_3$GeTe$_2$ Crystals
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Tyson, T. A. Amarasinghe, S. Abeykoon, AM M. Lalancette, R. Du, S. K. Fang, X. Cheong, S. -W. Al-Mahboob, A. Sadowski, J. T. |
| author_facet | Tyson, T. A. Amarasinghe, S. Abeykoon, AM M. Lalancette, R. Du, S. K. Fang, X. Cheong, S. -W. Al-Mahboob, A. Sadowski, J. T. |
| contents | The surface magnetization of Fe$_3$GeTe$_2$ was examined by low-energy electron microscopy (LEEM) using an off-normal incidence electron beam. We found that the 180$^o$ domain walls are of Bloch type. Temperature-dependent LEEM measurements yield a surface magnetization with a surface critical exponent $β$1 = 0.79 +/- 0.02. This result is consistent with surface magnetism in the 3D semi-infinite Heisenberg ($β$1 = 0.84 +/- 0.01) or Ising ($β$1 = 0.78 +/- 0.02) models, which is distinctly different from the bulk exponent ($β$ = 0.34 +/- 0.07). The measurements reveal the power of LEEM with a tilted beam to determine magnetic domain structure in quantum materials. Single crystal diffraction measurements reveal inversion symmetry-breaking weak peaks and yield space group P-6m2. This Fe site defect-derived loss of inversion symmetry enables the formation of skyrmions in this Fe$_3$GeTe$_2$ crystal. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_03565 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Surface Magnetism in Fe$_3$GeTe$_2$ Crystals Tyson, T. A. Amarasinghe, S. Abeykoon, AM M. Lalancette, R. Du, S. K. Fang, X. Cheong, S. -W. Al-Mahboob, A. Sadowski, J. T. Materials Science Mesoscale and Nanoscale Physics The surface magnetization of Fe$_3$GeTe$_2$ was examined by low-energy electron microscopy (LEEM) using an off-normal incidence electron beam. We found that the 180$^o$ domain walls are of Bloch type. Temperature-dependent LEEM measurements yield a surface magnetization with a surface critical exponent $β$1 = 0.79 +/- 0.02. This result is consistent with surface magnetism in the 3D semi-infinite Heisenberg ($β$1 = 0.84 +/- 0.01) or Ising ($β$1 = 0.78 +/- 0.02) models, which is distinctly different from the bulk exponent ($β$ = 0.34 +/- 0.07). The measurements reveal the power of LEEM with a tilted beam to determine magnetic domain structure in quantum materials. Single crystal diffraction measurements reveal inversion symmetry-breaking weak peaks and yield space group P-6m2. This Fe site defect-derived loss of inversion symmetry enables the formation of skyrmions in this Fe$_3$GeTe$_2$ crystal. |
| title | Surface Magnetism in Fe$_3$GeTe$_2$ Crystals |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.03565 |