Streubel Robert, Han Luyang, Im Mi-Young, Kronast Florian, Rößler Ulrich K, Radu Florin, Abrudan Radu, Lin Gungun, Schmidt Oliver G, Fischer Peter, Makarov Denys
Institute for Integrative Nanosciences, IFW Dresden, 01069 Dresden, Germany.
1] Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA [2] Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea.
Sci Rep. 2015 Mar 5;5:8787. doi: 10.1038/srep08787.
Topological magnetic states, such as chiral skyrmions, are of great scientific interest and show huge potential for novel spintronics applications, provided their topological charges can be fully controlled. So far skyrmionic textures have been observed in noncentrosymmetric crystalline materials with low symmetry and at low temperatures. We propose theoretically and demonstrate experimentally the design of spin textures with topological charge densities that can be tailored at ambient temperatures. Tuning the interlayer coupling in vertically stacked nanopatterned magnetic heterostructures, such as a model system of a Co/Pd multilayer coupled to Permalloy, the in-plane non-collinear spin texture of one layer can be imprinted into the out-of-plane magnetised material. We observe distinct spin textures, e.g. vortices, magnetic swirls with tunable opening angle, donut states and skyrmion core configurations. We show that applying a small magnetic field, a reliable switching between topologically distinct textures can be achieved at remanence.
拓扑磁态，如手性斯格明子，具有极大的科学研究价值，并且在新型自旋电子学应用中展现出巨大潜力，前提是其拓扑电荷能够得到完全控制。到目前为止，斯格明子纹理已在具有低对称性的非中心对称晶体材料中且在低温下被观测到。我们通过理论提出并通过实验证明了在室温下可定制拓扑电荷密度的自旋纹理设计。通过调整垂直堆叠的纳米图案化磁性异质结构中的层间耦合，例如钴/钯多层膜与坡莫合金耦合的模型系统，一层的面内非共线自旋纹理可以被印刻到面外磁化材料中。我们观测到了不同的自旋纹理，例如涡旋、具有可调开口角的磁涡旋、甜甜圈态以及斯格明子核心构型。我们表明，施加一个小磁场，在剩余磁化强度下可以实现拓扑不同纹理之间的可靠切换。
