Deeply nonlinear excitation of self-normalised exchange spin waves

2022/07/03 by Wang, Qi, Verba, Roman, Heinz, Björn +9 · 1 citation
#Applied Physics (physics.app-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2207.01121

Abstract

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° 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.

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• Ultra-long-living magnons in the quantum limit

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