Homogeneous microwave field emitted propagating spin waves: Direct imaging and modeling

Homogeneous microwave field emitted propagating spin waves: Direct imaging and modeling
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均匀微波场发射传播自旋波:直接成像和建模

DOI:
10.1016/j.jmmm.2017.06.053
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发表时间:
2018
影响因子:
2.7
通讯作者:
J. McCord
J. McCord
中科院分区:
材料科学3区
文献类型:
--
作者:
M. Lohman;B. Mozooni;J. McCord

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我们研究了在磁性微结构边界附近均匀磁场激发产生传播的偶极自旋波的问题。通过时间分辨的广场磁光克尔效应显微镜,可以直接成像磁区壁运动、进动动力学和传播的自旋波。通过与实验结果相吻合的微磁计算,阐明了自旋波产生的各个方面。由于图案化样品边缘不均匀的内部退磁场,偶极自旋波的形成区域仅限于局部共振激发。磁畴壁作为平面自旋波和低衰减自旋波传播的边界,从而抑制了单个磁畴内的自旋波。这些发现对于一般理解结构和构型磁边界对于自旋波的产生、传播和消除具有重要意义。
We explore the generation of propagating dipolar spin waves by homogeneous magnetic field excitation in the proximity of the boundaries of magnetic microstructures. Domain wall motion, precessional dynamics, and propagating spin waves are directly imaged by time-resolved wide-field magneto-optical Kerr effect microscopy. The aspects of spin wave generation are clarified by micromagnetic calculations matching the experimental results. The region of dipolar spin wave formation is confined to the local resonant excitation due to non-uniform internal demagnetization fields at the edges of the patterned sample. Magnetic domain walls act as a border for the propagation of plane and low damped spin waves, thus restraining the spin waves within the individual magnetic domains. The findings are of significance for the general understanding of structural and configurational magnetic boundaries for the creation, the propagation, and elimination of spin waves.
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