National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 22 Hankou Road, Nanjing 210093, People's Republic of China.
Phys Rev Lett. 2013 Apr 19;110(16):167201. doi: 10.1103/PhysRevLett.110.167201.
A Skyrmion crystal typically arises from helical spin structures induced by the Dzyaloshinskii-Moriya interaction. Experimentally its physical exploration has been impeded because it is a rarity and is found only within a narrow temperature and magnetic field range. We present a method for the assembly of a two-dimensional Skyrmion crystal based upon a combination of a perpendicularly magnetized film and nanopatterned arrays of magnetic vortices that are geometrically confined within nanodisks. The practical feasibility of the method is validated by micromagnetic simulations and computed Skyrmion number per unit cell. We also quantify a wide range in temperature and field strength over which the Skyrmion crystal can be stabilized without the need for any intrinsic Dzyaloshinskii-Moriya interactions, which otherwise is needed to underpin the arrangement as is the case in the very few known Skyrmion crystal cases. Thus, our suggested scheme involves a qualitative breakthrough that comes with a substantial quantitative advance.
斯格明子晶体通常由狄亚洛斯基-莫里亚相互作用诱导的螺旋自旋结构产生。由于它很罕见，并且只在狭窄的温度和磁场范围内存在，因此其物理探索受到了阻碍。我们提出了一种基于垂直磁化膜和纳米图案化的磁涡旋阵列的二维斯格明子晶体组装方法，这些磁涡旋在纳米盘中受到几何限制。该方法的实际可行性通过微磁模拟和计算的单位晶胞中的斯格明子数量得到了验证。我们还量化了在不需要任何内在的狄亚洛斯基-莫里亚相互作用的情况下，可以稳定斯格明子晶体的温度和场强的广泛范围，否则就需要这种相互作用来支撑这种排列，就像在极少数已知的斯格明子晶体情况下一样。因此，我们建议的方案涉及到一个实质性的突破，同时也带来了实质性的进展。
