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Observation of evanescent spin waves in the magnetic dipole regime

志村 努 佐藤 琢哉 Tsutomu Shimura Takuya Satoh 東京工業大学 DOI:https://doi.org/10.1103/PhysRevB.101.184407

2020.05.05

概要

We observed spin-wave transmission through an air gap that works as a prohibited region. The spin waves were excited by circularly polarized pump pulses via the inverse Faraday effect, and their spatial propagation was detected through the Faraday effect of probe pulses using a pump-probe imaging technique. The experimentally observed spin-wave transmission was reproduced using numerical calculations with a Green’s function method and micromagnetic simulation. We found that the amplitude of the spin waves decays exponentially in the air gap, which indicates the existence of evanescent spin waves in the magnetic dipole regime. This finding will pave the way for controllable amplitudes and phases of spin waves propagating through an artificial magnonic crystal.

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