铁磁体-超导体异质结构中超导涡旋上的束缚态和磁子散射

D. S. Katkov, S. S. Apostoloff, I. S. Burmistrov
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引用次数: 0

摘要

我们研究了存在单个超导漩涡的薄铁磁-超导体异质结构中的磁子频谱。我们采用波格鲁波夫-德-吉尼斯哈密顿描述了磁子在杂散磁场和漩涡诱导的非均匀磁纹理存在下的情况。我们发现,涡旋定位磁子态的方式与电荷中心在二维电子气中由于屏蔽库仑相互作用而产生电子束缚态的方式大致相同。定位态的数量在很大程度上只取决于铁磁薄膜的材料参数。我们求解了入射平面波的散射问题,并计算了总截面和传输截面。我们证明了手性铁磁薄膜中涡旋诱导的非均匀磁纹理会产生磁子偏斜散射。我们探讨了量子散射问题的特殊性,它与经典极限中的绕射相对应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bound states and scattering of magnons on a superconducting vortex in ferromagnet-superconductor heterostructures
We study the magnon spectrum in a thin ferromagnetic-superconductor heterostructure in the presence of a single superconducting vortex. We employ the Bogolubov-de Gennes Hamiltonian which describes the magnons in the presence of the stray magnetic field and the non-uniform magnetic texture induced by the vortex. We find that the vortex localizes magnon states approximately in the same way as a charge center produces electron bound states due to screened Coulomb interaction in the two-dimensional electron gas. The number of these localized states is substantially determined by the material parameters of the ferromagnetic film only. We solve the scattering problem for an incident plane spin wave and compute the total and transport cross sections. We demonstrate that the vortex-induced non-uniform magnetic texture in chiral ferromagnetic film produces a skew scattering of magnons. We explore the peculiarities of the quantum scattering problem that correspond to orbiting in the classical limit.
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