论文标题
在六角形和三角式单离子各向异性下的中心对称三角磁体中的Skyrmion晶体
Skyrmion crystals in centrosymmetric triangular magnets under hexagonal and trigonal single-ion anisotropy
论文作者
论文摘要
从理论上讲，我们报告了在六角形和三角形单离子各向异性下的中心对称磁铁中的天际晶体的不稳定性。通过进行模拟退火，在三角形晶格上具有晶体依赖性的单离子各向异性的最小自旋模型获得了结果。通过在存在六种不同类型的单离子各向异性的情况下构建磁相图，同时以系统的方式更改外部磁场和单离子各向异性的幅度，我们发现六边形和三角离子各向离子各向异性变成了基于磁性磁场方向的Skyrmion晶体的来源。我们表明，在平面外磁场下，单轴型或三角形单离子各向异性稳定，而六边形型单型单位离子各向异性在六边形型在内平面磁场下稳定。我们还发现各种多重Q $旋转状态，具体取决于单离子各向异性的类型。
We theoretically report an instability toward a skyrmion crystal in centrosymmetric magnets under hexagonal and trigonal single-ion anisotropy. The results are obtained for a minimal spin model with a crystal-dependent single-ion anisotropy on a triangular lattice by performing simulated annealing. By constructing magnetic phase diagrams in the presence of six different types of single-ion anisotropy while changing the amplitudes of external magnetic field and single-ion anisotropy in a systematic way, we find that the hexagonal and trigonal single-ion anisotropy becomes a source of the skyrmion crystal depending on the magnetic-field direction. We show that the skyrmion crystal is stabilized by the uniaxial-type or trigonal-type single-ion anisotropy under the out-of-plane magnetic field, while it is stabilized by the hexagonal-type inplane single-ion anisotropy under the inplane magnetic field. We also find various multiple-$Q$ spin states depending on the types of the single-ion anisotropy.
