偶极耦合磁性粒子小阵列的涡旋基态
Vortex ground state for small arrays of magnetic particles with dipole coupling
摘要：
我们表明，磁涡旋是一个阵列的磁性粒子的形状为一个六边形的三角形晶格片段的基态，即使在阵列$N \leq 100$的粒子数很少。随着粒子$β$内禀磁各向异性的增加，出现了涡旋核，涡旋态的对称性发生了变化，$β$的进一步增加导致了涡旋态的破坏。这样的涡流可以以阵列的形式存在，其尺寸小到几十纳米。
英文摘要：
We show that a magnetic vortex is the ground state of an array of magnetic particles shaped as a hexagonal fragment of a triangular lattice, even for an small number of particles in the array $N \leq 100$. The vortex core appears and the symmetry of the vortex state changes with the increase of the intrinsic magnetic anisotropy of the particle $β$; the further increase of $β$ leads to the destruction of the vortex state. Such vortices can be present in arrays as small in size as dozen of nanometers.
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