Theory of Linear Spin Wave Emission from a Bloch Domain Wall
Physical Review B
American Physical Society
©2017 American Physical Society
We report an analytical theory of linear emission of exchange spin waves from a Bloch domain wall, excited by a uniform microwave magnetic field. The problem is reduced to a one-dimensional Schr\"odinger-like equation with a P\"oschl-Teller potential and a driving term of the same profile. The emission of plane spin waves is observed at excitation frequencies above a threshold value, as a result of a linear process. The height-to-width aspect ratio of the P\"oschl-Teller profile for a domain wall is found to correspond to a local maximum of the emission efficiency. Furthermore, for a tailored P\"oschl-Teller potential with a variable aspect ratio, particular values of the latter can lead to enhanced or even completely suppressed emission.
This research has received funding from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC center for Doctoral Training in Metamaterials (Grant No. EP/L015331/1), and the European Union's Horizon 2020 research and innovation program under Marie Sklodowska-Curie Grant Agreement No. 644348 (MagIC). SARH would like to thank the Royal Society and TATA for fi nancial support.
This is the author accepted manuscript. The final version is available from American Physical Society via the DOI in this record.
Vol. 96, article 064415