Theory of Linear Spin Wave Emission from a Bloch Domain Wall
Whitehead, NJ; Horsley, SAR; Philbin, TG; et al.Kuchko, AN; Kruglyak, VV
Date: 11 August 2017
Article
Journal
Physical Review B
Publisher
American Physical Society
Publisher DOI
Abstract
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 ...
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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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