偶极交换静磁表面自旋波的后向散射免疫
Backscattering immunity of dipole-exchange magnetostatic surface spin waves
摘要：
在纳米级厚度的磁性薄膜中，证明了背散射免疫自旋波模的存在。我们的研究结果表明，手征静磁表面波（cMSSWs），传播垂直于磁化方向的面内磁化薄膜，是强大的对背散射的表面缺陷。只要cMSSW的频率位于体积模式的间隙内，cMSSW就可以免受各种类型的表面不均匀性和缺陷的影响。我们的解释是独立的模式的拓扑结构，并预测，这种鲁棒性是对称性破坏的动态磁场的cMSSW由于偶极相互作用张量，这是目前的长（偶极为主）和短波长（交换为主）自旋波的非对角部分的后果。微磁学模拟证实了cMSSW的鲁棒特性。我们的研究结果开辟了一个新的方向，在设计高效的磁振子逻辑元件和器件采用cMSSW在纳米尺度薄膜。
英文摘要：
The existence of backscattering-immune spin-wave modes is demonstrated in magnetic thin films of nano-scale thickness. Our results reveal that chiral Magneto Static Surface Waves (cMSSWs), which propagate perpendicular to the magnetization direction in an in-plane magnetized thin film, are robust against backscattering from surface defects. cMSSWs are protected against various types of surface inhomogeneities and defects as long as their frequency lies inside the gap of the volume modes. Our explanation is independent of the topology of the modes and predicts that this robustness is a consequence of symmetry breaking of the dynamic magnetic fields of cMSSWs due to the off-diagonal part of the dipolar interaction tensor, which is present both for long- (dipole dominated) and short-wavelength (exchange dominated) spin waves. Micromagnetic simulations confirm the robust character of the cMSSWs. Our results open a new direction in designing highly efficient magnonic logic elements and devices employing cMSSWs in nano-scale thin films.
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