Nanometric skyrmion lattice from anisotropic exchange interactions in a centrosymmetric host
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| Format: | Preprint |
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2025
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| _version_ | 1866912290497888256 |
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| author | Hirschberger, Max Hayami, Satoru Tokura, Yoshinori |
| author_facet | Hirschberger, Max Hayami, Satoru Tokura, Yoshinori |
| contents | Skyrmion formation in centrosymmetric magnets without Dzyaloshinskii-Moriya interactions was originally predicted from unbiased numerical techniques. However, no attempt has yet been made, by comparison to a real material, to determine the salient interaction terms and model parameters driving spin-vortex formation. We identify a Hamiltonian with anisotropic exchange couplings, local ion anisotropy, and four-spin interactions, which is generally applicable to this class of compounds. In the representative system Gd3Ru4Al12, anisotropic exchange drives a fragile balance between helical, skyrmion lattice, and transverse conical (cycloidal) orders. The model is severely constrained by the experimentally observed collapse of the SkL with a small in-plane magnetic field. For the zero-field helical state, we further anticipate that spins can be easily rotated out of the spiral plane by a tilted magnetic field or applied current. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_18632 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nanometric skyrmion lattice from anisotropic exchange interactions in a centrosymmetric host Hirschberger, Max Hayami, Satoru Tokura, Yoshinori Strongly Correlated Electrons Materials Science Skyrmion formation in centrosymmetric magnets without Dzyaloshinskii-Moriya interactions was originally predicted from unbiased numerical techniques. However, no attempt has yet been made, by comparison to a real material, to determine the salient interaction terms and model parameters driving spin-vortex formation. We identify a Hamiltonian with anisotropic exchange couplings, local ion anisotropy, and four-spin interactions, which is generally applicable to this class of compounds. In the representative system Gd3Ru4Al12, anisotropic exchange drives a fragile balance between helical, skyrmion lattice, and transverse conical (cycloidal) orders. The model is severely constrained by the experimentally observed collapse of the SkL with a small in-plane magnetic field. For the zero-field helical state, we further anticipate that spins can be easily rotated out of the spiral plane by a tilted magnetic field or applied current. |
| title | Nanometric skyrmion lattice from anisotropic exchange interactions in a centrosymmetric host |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2503.18632 |