异质磁性纳米盘中各向异性方位模的自旋动力学
Spin dynamics of anisotropic azimuthal modes in heterogeneous magnetic nanodisks
摘要：
众所周知，坡莫合金纳米盘中磁涡旋态的方位角自旋波模具有圆对称性。直觉上，具有磁晶各向异性的磁性材料与方位角模式的圆对称性不相容。然而，在这篇文章中，我们报告立方方位角模式在异质纳米盘组成的坡莫合金核心和铁壳。方位角模的四重对称性是由于坡莫合金芯和Fe壳之间的交换和静磁相互作用。与圆形方位角模式的结果相比，在立方方位角模式的激励下，涡旋开关发生得更快。在Py区，受感生立方各向异性的影响，涡核的回转路径变为正方形。我们还发现了涡核尺寸和涡度的周期性振荡。我们的研究结果可能为利用异质磁性纳米结构的自旋电子学应用提供一条新的途径。
英文摘要：
It is well known that azimuthal spin wave modes of magnetic vortex state in permalloy nanodisks have circular symmetry. Intuitively, magnetic materials having magnetocrystalline anisotropy is not compatible with the circular symmetry of the azimuthal modes. In this article, however, we report cubic azimuthal modes in heterogeneous nanodisks consisting of a permalloy core and a Fe shell. The fourfold symmetry of azimuthal modes is due to the exchange, and magneto-static, interactions between the permalloy core and the Fe shell. In comparison to results of circular azimuthal mode, the vortex switching occurs considerably faster under the excitation of cubic azimuthal mode. The gyration path of vortex core turns into square under the influence of induced cubic anisotropy in the Py region. We find out periodic oscillation of the vortex core size and the gyration speed as well. Our findings may offer a new route for spintronic applications using heterogeneous magnetic nanostructures.
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