Prediction of stable nanoscale skyrmions in monolayer Fe$_5$GeTe$_2$
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914830998306816 |
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| author | Li, Dongzhe Haldar, Soumyajyoti Kollwitz, Leo Schrautzer, Hendrik Goerzen, Moritz A. Heinze, Stefan |
| author_facet | Li, Dongzhe Haldar, Soumyajyoti Kollwitz, Leo Schrautzer, Hendrik Goerzen, Moritz A. Heinze, Stefan |
| contents | Using first-principles calculations and atomistic spin simulations, we predict stable isolated skyrmions with a diameter below 10 nm in a monolayer of the two-dimensional van der Waals ferromagnet Fe$_5$GeTe$_2$, a material of significant experimental interest. A very large Dzyaloshinskii-Moriya interaction (DMI) is observed due to the intrinsic broken inversion symmetry and strong spin-orbit coupling for monolayer Fe$_5$GeTe$_2$. We show that the nearest-neighbor approximation, often used in literature, fails to describe the DMI. The strong DMI together with moderate in-plane magnetocrystalline anisotropy energy allows to stabilize nanoscale skyrmions in out-of-plane magnetic fields above $\approx 2$~T. The energy barriers of skyrmions in monolayer Fe$_5$GeTe$_2$ are comparable to those of state-of-the-art transition-metal ultra-thin films. We further predict that these nanoscale skyrmions can be stable for hours at temperatures up to 20 K. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_18000 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Prediction of stable nanoscale skyrmions in monolayer Fe$_5$GeTe$_2$ Li, Dongzhe Haldar, Soumyajyoti Kollwitz, Leo Schrautzer, Hendrik Goerzen, Moritz A. Heinze, Stefan Materials Science Mesoscale and Nanoscale Physics Using first-principles calculations and atomistic spin simulations, we predict stable isolated skyrmions with a diameter below 10 nm in a monolayer of the two-dimensional van der Waals ferromagnet Fe$_5$GeTe$_2$, a material of significant experimental interest. A very large Dzyaloshinskii-Moriya interaction (DMI) is observed due to the intrinsic broken inversion symmetry and strong spin-orbit coupling for monolayer Fe$_5$GeTe$_2$. We show that the nearest-neighbor approximation, often used in literature, fails to describe the DMI. The strong DMI together with moderate in-plane magnetocrystalline anisotropy energy allows to stabilize nanoscale skyrmions in out-of-plane magnetic fields above $\approx 2$~T. The energy barriers of skyrmions in monolayer Fe$_5$GeTe$_2$ are comparable to those of state-of-the-art transition-metal ultra-thin films. We further predict that these nanoscale skyrmions can be stable for hours at temperatures up to 20 K. |
| title | Prediction of stable nanoscale skyrmions in monolayer Fe$_5$GeTe$_2$ |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.18000 |