图案化磁结构中微波到传播自旋波的宽带转换
Broadband conversion of microwaves into propagating spin waves in patterned magnetic structures
摘要：
我们已经使用时间分辨扫描克尔显微镜（TRSKM）和微磁模拟来证明，当由空间均匀的微波场驱动时，图案化的磁性样品的边缘代表传播自旋波的高效和高度可调的源。激励是由于与边缘对齐的旋进磁化产生的非均匀动态退磁场引起的共振频率的局部增强。我们的研究结果代表了一个关键的一步，在磁振子架构的纳米级自旋波源的设计，也是高度相关的理解和解释的磁化动力学驱动的空间均匀磁场图案化的磁性样品。
英文摘要：
We have used time-resolved scanning Kerr microscopy (TRSKM) and micromagnetic simulations to demonstrate that, when driven by spatially uniform microwave field, the edges of patterned magnetic samples represent both efficient and highly tunable sources of propagating spin waves. The excitation is due to the local enhancement of the resonance frequency induced by the non-uniform dynamic demagnetizing field generated by precessing magnetization aligned with the edges. Our findings represent a crucial step forward in the design of nanoscale spin-wave sources for magnonic architectures, and are also highly relevant to the understanding and interpretation of magnetization dynamics driven by spatially-uniform magnetic fields in patterned magnetic samples.
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