一维平面磁振子晶体中的自旋波表面态
Spin wave surface states in one-dimensional planar magnonic crystals
摘要：
我们研究了一维平面双组分磁振子晶体中周期结构破碎后的表面自旋波态。考虑了两种系统：在交换区各向异性场周期性变化的磁振子晶体和在偶极区包含交换相互作用的Fe和Ni条带组成的磁振子晶体。我们为这两个系统选择了对称单胞来实现表面态存在的对称性相关标准。我们还研究了磁振子晶体的表面积的扰动的存在下引起的表面状态。我们证明了具有调制各向异性的系统是电子晶体的直接模拟。因此，两个系统中的表面态具有相同的性质。对于存在于磁振子晶体中的偶极区的表面态，我们证明了自旋波与电子晶体保持着明显的差异，这是由于长程动态偶极相互作用。我们发现，由表面各向异性或偶极效应引起的磁化钉扎强度的调节对于磁振子晶体中表面态的存在至关重要。
英文摘要：
We have investigated surface spin wave states in one-dimensional planar bi-component magnonic crystals, localized on the surfaces resulting from the breaking of the periodic structure. The two systems have been considered: the magnonic crystal with periodic changes of the anisotropy field in exchange regime and the magnonic crystal composed of Fe and Ni stripes in dipolar regime with exchange interactions included. We chose the symmetric unit cell for both systems to implement the symmetry related criteria for existence of the surface states. We investigated also the surface states induced by the presence of perturbation of the surface areas of the magnonic crystals. We showed, that the system with modulated anisotropy is a direct analog of the electronic crystal. Therefore, the surface states in both systems have the same properties. For surface states existing in magnonic crystals in dipolar regime we demonstrated that spin waves preserve distinct differences to the electronic crystals, which are due to long-range dynamic dipolar interactions. We found that tuning of the strength of magnetization pinning resulting from the surface anisotropy or dipolar effect is vitally important for existence of the surface states in magnonic crystals.
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