Broadband conversion of microwaves into propagating spin waves in patterned magnetic structures (article)
Applied Physics Letters
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.
The research leading to these results has received funding from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom (Project Nos. EP/L019876/1, EP/L020696 and EP/P505526/1).
The dataset associated with this article is in ORE at http://hdl.handle.net/10871/28587
This is the author accepted manuscript. The final version is available from AIP Publishing via the DOI in this record.
Vol. 111 (4), article 042404