Reverse Doppler effect in backward spin waves scattered on acoustic waves

Details Reverse Doppler effect in backward spin waves scattered on acoustic waves Reverse Doppler effect in backward spin waves scattered on acoustic waves

2009-07-16

arxiv.org/abs/0907.2902v1

Phys. Rev. B 81, 140404(R) (2010)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.81.140404

We report on the observation of reverse Doppler effect in backward spin waves reflected off of surface acoustic waves. The spin waves are excited in a yttrium iron garnet (YIG) film. Simultaneously, acoustic waves are also generated. The strain induced by the acoustic waves in the magnetostrictive YIG film results in the periodic modulation of the magnetic anisotropy in the film. Thus, in effect, a travelling Bragg grating for the spin waves is produced. The backward spin waves reflecting off of this grating exhibit a reverse Doppler shift: shifting down rather than up in frequency when reflecting off of an approaching acoustic wave. Similarly, the spin waves are shifted up in frequency when reflecting from receding acoustic waves.

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