Published January 1, 2018
| Version v1
Journal article
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Origin of temperature and field dependence of magnetic skyrmion size in ultrathin nanodots
Creators
- 1. Univ Perugia, Dept Engn, Polo Sci Didatt Terni, I-50100 Terni, Italy
- 2. Univ Calabria, Dept Comp Sci Modeling Elect & Syst Sci, I-87036 Arcavacata Di Rende, Italy
- 3. Univ Messina, Dept Math & Comp Sci Phys Sci & Earth Sci, I-98166 Messina, Italy
- 4. Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
- 5. Politecn Bari, Dept Elect & Informat Engn, I-70125 Bari, Italy
- 6. CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain
Description
Understanding the physical properties of magnetic skyrmions is important for fundamental research with the aim to develop new spintronic device paradigms where both logic and memory can be integrated at the same level. Here, we show a universal model based on the micromagnetic formalism that can be used to study skyrmion stability as a function of magnetic field and temperature. We consider ultrathin, circular ferromagnetic magnetic dots. Our results show that magnetic skyrmions with a small radius-compared to the dot radius-are always metastable, while large radius skyrmions form a stable ground state. The change of energy profile determines the weak (strong) size dependence of the metastable (stable) skyrmion as a function of temperature and/or field.
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