Theory of linear spin wave emission from a Bloch domain wall
| Autor: | Simon A. R. Horsley, A. N. Kuchko, N. J. Whitehead, Thomas G. Philbin, V. V. Kruglyak |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed Matter - Materials Science Aspect ratio Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Plane (geometry) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Domain wall (magnetism) Spin wave Excited state 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics 0210 nano-technology Excitation Microwave |
| Zdroj: | Physical Review B |
| ISSN: | 1098-0121 |
| DOI: | 10.1103/physrevb.96.064415 |
| Popis: | 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. Comment: added ancillary files |
| Databáze: | OpenAIRE |
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