论文标题
外延MNSI（111）/si（111）薄膜的平面内和平面外手性天空的稳定性：表面曲折与易于平面各向异性
Stability of in-plane and out-of-plane chiral skyrmions in epitaxial MnSi(111)/Si(111) thin films: surface twists versus easy-plane anisotropy
论文作者
论文摘要
如先前报道的Thys [Phys。 Rev. B 85，094429（2012）]。对于施加的磁场的面内和面外方向，相图显示了稳定的天空露骨的广泛区域，这与广泛的各向异性参数重叠。尽管在以前的理论模型中存在平面外天空的存在是矛盾的，但我们证明了额外的表面曲折会导致它们的稳定性，而中等的易于平面各向异性则增加了面内天空源的稳定性范围。此外，各向异性和表面曲折之间的相互作用会导致相对于表面倾斜的稳定螺旋状态。这种倾斜的螺旋在庞大的helimagnets中不存在，在薄膜纳米系统中的相图中占据了广阔的区域，并用作锥形和螺旋体之间的连接连接。我们的理论给出了明确的方向，用于对外延MNSI（111）/SI（111）薄膜的面内和面外空间的实验研究。
The revisited theoretical phase diagrams for thin films of cubic helimagnets with the easy-plane anisotropy are shown to have different topology as previously reported [Phys. Rev. B 85, 094429 (2012)]. For both in-plane and out-of-plane directions of an applied magnetic field, the phase diagrams exhibit extensive areas of stable skyrmions, which overlap for a wide range of anisotropy parameters. Although the existence of the out-of-plane skyrmions was contradicted within the previous theoretical models, we prove that additional surface twists lead to their stability, while the moderate easy-plane anisotropy increases the stability range of in-plane skyrmions. Moreover, the interplay between the anisotropy and the surface twists gives rise to a stable spiral state canted with respect to the surfaces. Being absent in bulk helimagnets, this oblique spiral occupies vast areas at the phase diagrams in thin-film nanosystems and serves as a connecting-link between cones and helicoids. Our theory gives clear directions for renewed experimental studies of in-plane and out-of-plane skyrmions in epitaxial MnSi(111)/Si(111) thin films.
