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Fully Resonant Magneto-elastic Spin-wave Excitation by Surface Acoustic Waves under Conservation of Energy and Linear Momentum

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arxiv 2106.14705 v3 pith:CEDBSFF3 submitted 2021-06-28 cond-mat.other cond-mat.mes-hall

Moritz Geilen , Alexandra Nicoloiu , Daniele Narducci , Morteza Mohseni , Moritz Bechberger , Milan Ender , Florin Ciubotaru , Alexandru Müller
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Burkard Hillebrands Christoph Adelmann Philipp Pirro
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classification cond-mat.othercond-mat.mes-hall
keywords wavesexcitationspinacousticmomentumconservationenergyfully
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We report on the resonant excitation of spin waves in micro-structured magnetic thin films by surface acoustic waves (SAWs). The spin waves as well as the acoustic waves are studied by micro-focused Brillouin light scattering spectroscopy. Besides the excitation of the ferromagnetic resonance, a process which does not fulfill momentum conservation, also the excitation of finite-wavelength spin waves can be observed at low magnetic fields. Using micromagnetic simulations, we verify that during this excitation both energy and linear momentum are conserved and fully transferred from the SAW to the spin wave.

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