Broadband conversion of microwaves into propagating spin waves in patterned magnetic structures

We have used time-resolved scanning Kerr microscopy and micromagnetic simulations to demonstrate that, when driven by the 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...

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Bibliographic Details
Published in:Applied physics letters 2017-07, Vol.111 (4)
Main Authors: Mushenok, F. B., Dost, R., Davies, C. S., Allwood, D. A., Inkson, B. J., Hrkac, G., Kruglyak, V. V.
Format: Article
Language:English
Subjects:
Applied physics
Broadband
Demagnetization
Magnetic resonance
Magnetization
Magnons
Microwaves
Wave propagation
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Summary:We have used time-resolved scanning Kerr microscopy and micromagnetic simulations to demonstrate that, when driven by the 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4995991