Single Chiral Skyrmions in Ultrathin Magnetic Films
The stability and sizes of chiral skyrmions in ultrathin magnetic films are calculated accounting for the isotropic exchange, Dzyaloshinskii-Moriya exchange interaction (DMI), and out-of-plane magnetic anisotropy within micromagnetic approach. Bloch skyrmions in ultrathin magnetic films with B20 cub...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/32195 |
| Acceso en línea: | http://hdl.handle.net/10810/32195 |
| Access Level: | acceso abierto |
| Palabra clave: | magnetic skyrmion ultrathin film micromagnetism stability nanodots state |
| Sumario: | The stability and sizes of chiral skyrmions in ultrathin magnetic films are calculated accounting for the isotropic exchange, Dzyaloshinskii-Moriya exchange interaction (DMI), and out-of-plane magnetic anisotropy within micromagnetic approach. Bloch skyrmions in ultrathin magnetic films with B20 cubic crystal structure (MnSi, FeGe) and Neel skyrmions in ultrathin films and multilayers Co/X (X = Ir, Pd, Pt) are considered. The generalized DeBonte ansatz is used to describe the inhomogeneous skyrmion magnetization. The single skyrmion metastability/instability area, skyrmion radius, and skyrmion width are found analytically as a function of DMI strength d. It is shown that the single chiral skyrmions are metastable in infinite magnetic films below a critical value of DMI d(c), and do not exist at d > d(c). The calculated skyrmion radius increases as d increases and diverges at d -> d(c) - 0, whereas the skyrmion width increases monotonically as d increases up to d(c) without any singularities. The calculated skyrmion width is essentially smaller than the one calculated within the generalized domain wall model. |
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