Reconfigurable heat-induced spin wave lenses

We study the control and manipulation of propagating spin waves in yttrium iron garnet films using a local laser-induced heating. We show that, due to the refraction of spin waves in the thermal gradients, the heated region acts as a defocusing lens for Damon-Eshbach spin waves and as a focusing len...

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Bibliographic Details
Published in:Applied physics letters 2016-12, Vol.109 (23)
Main Authors: Dzyapko, O., Borisenko, I. V., Demidov, V. E., Pernice, W., Demokritov, S. O.
Format: Article
Language:English
Subjects:
Applied physics
Beams (radiation)
Collimation
Defocusing
Laser beam heating
Magnons
Wave diffraction
Wave propagation
Yttrium
Yttrium-iron garnet
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Summary:We study the control and manipulation of propagating spin waves in yttrium iron garnet films using a local laser-induced heating. We show that, due to the refraction of spin waves in the thermal gradients, the heated region acts as a defocusing lens for Damon-Eshbach spin waves and as a focusing lens for backward volume waves enabling collimation of spin-wave beams in the latter case. In addition to the focusing/defocusing functionality, the local heating allows one to manipulate the propagation direction of the spin-wave beams and to efficiently suppress their diffraction spreading by utilizing caustic effects.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4971829