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arXiv · 1705.01852

Theory of Linear Spin Wave Emission from a Bloch Domain Wall

N. J. Whitehead·S. A. R. Horsley·T. G. Philbin·A. N. Kuchko·V. V. Kruglyak
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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 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.

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N. J. Whitehead, S. A. R. Horsley, T. G. Philbin, A. N. Kuchko, V. V. Kruglyak. 2017-05-04. Theory of Linear Spin Wave Emission from a Bloch Domain Wall. https://doi.org/10.1103/physrevb.96.064415

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