| 研究実績の概要 |
In collaboration with a group from Augsburg lead by Prof. Kezsmarki, I published 3 papers (2 Phys. Rev. B and Scientific Reports) on a new class of isolated magnetic skyrmions emerging within tilted ferromagnetic phases of polar magnets with easy-plane anisotropy. Thus the developed theory was fully supported by the experiments in lacunar spinels hosting Neel-type skyrmions.We also demonstrated that the stability range of skyrmions can be drastically increased in systems with restricted geometries, such as thin films, interfaces and nanowires. Thermal quenching can also promote the skyrmion lattice as a metastable state over extended temperature ranges.
In collaboration with the group from Department of Materials Science and Metallurgy,Cambridge, we also experimentally observed attractive skyrmions and skyrmion clusters in thin (70 nm) single-crystal samples of Cu2OSeO3 taken using transmission electron microscopy. We developed a phenomenological theory describing this type of skyrmion and published the results in Phys. Rev. B.
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| 今後の研究の推進方策 |
The future plans include:
1. Description of the formation of isolated chiral skyrmions by homogeneous and heterogeneous nucleation in thin layers of cubic helimagnets via elongation of torons and chiral bobbers, correspondingly. Both torons and bobbers are localized in three dimensions, contain singularities, and according to the theoretical analysis within the standard phenomenological models can exist as metastable states in saturated and modulated phases of noncentrosymmetric ferromagnets.They represent new types of particle-like states in chiral magnets and liquid crystals.
2. Description of a new type of non-axisymmetric skyrmions arising within the conical phase with its axis perpendicular to the field. Such a skyrmion transforms into a pair of merons at lower fields.
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