Deeply nonlinear excitation of self-normalised exchange spin waves
| Autor: | Wang, Qi, Verba, Roman, Heinz, Björn, Schneider, Michael, Wojewoda, Ondřej, Davídková, Kristýna, Levchenko, Khrystyna, Dubs, Carsten, Mauser, Norbert J., Urbánek, Michal, Pirro, Philipp, Chumak, Andrii V. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Spin waves are ideal candidates for wave-based computing, but the construction of magnetic circuits is blocked by a lack of an efficient mechanism to excite long-running exchange spin waves with normalised amplitudes. Here, we solve the challenge by exploiting the deeply nonlinear phenomena of forward-volume spin waves in 200 nm wide nanoscale waveguides and validate our concept with microfocused Brillouin light scattering spectroscopy. An unprecedented nonlinear frequency shift of >2 GHz is achieved, corresponding to a magnetisation precession angle of 55{\deg} and enabling the excitation of exchange spin waves with a wavelength of down to ten nanometres with an efficiency of >80%. The amplitude of the excited spin waves is constant and independent of the input microwave power due to the self-locking nonlinear shift, enabling robust adjustment of the spin wave amplitudes in future on-chip magnonic integrated circuits. Comment: 21 pages, 5 figures |
| Databáze: | arXiv |
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