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Abstract
Spin waves in magnetic microresonators are at the core of modern magnonics. Here we demonstrate a new method of tunable excitation of different spin wave modes in magnetic microdisks by using a train of laser pulses coming at a repetition rate higher than the decay rate of spin precession. The microdisks are etched in a transparent bismuth iron garnet film and the light pulses influence the spins nonthermally through the inverse Faraday effect. The high repetition rate of the laser stimulus of 10 GHz establishes an interplay between the spin wave resonances in the frequency and momentum domains. As a result, scanning of the focused laser spot near the disk boarder changes interference pattern of the magnons and leads to a resonant dependence of the spin wave amplitude on the external magnetic field. Apart from that, we achieved a switching between volume and surface spin waves by a small variation of the external magnetic field.
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1 Russian Quantum Center, Moscow, Russia (GRID:grid.452747.7); Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory, Moscow, Russia (GRID:grid.14476.30) (ISNI:0000 0001 2342 9668)
2 TU Dortmund, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000 0001 0416 9637)
3 TU Dortmund, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000 0001 0416 9637); Russian Academy of Sciences, Ioffe Institute, St. Petersburg, Russia (GRID:grid.4886.2) (ISNI:0000 0001 2192 9124)
4 Russian Quantum Center, Moscow, Russia (GRID:grid.452747.7); Prokhorov General Physics Institute RAS, Moscow, Russia (GRID:grid.424964.9) (ISNI:0000 0004 0637 9699)
5 Vernadsky Crimean Federal University, Simferopol, Russia (GRID:grid.424964.9)
6 Russian Quantum Center, Moscow, Russia (GRID:grid.452747.7); Prokhorov General Physics Institute RAS, Moscow, Russia (GRID:grid.424964.9) (ISNI:0000 0004 0637 9699); National University of Science and Technology MISiS, NTI Center for Quantum Communications, Moscow, Russia (GRID:grid.35043.31) (ISNI:0000 0001 0010 3972)