Fresnel diffraction of spin waves

The propagation of magnetostatic forward volume waves excited by a constricted coplanar waveguide is studied via inductive spectroscopy techniques. A series of devices consisting of pairs of submicrometer size antennae is used to perform a discrete mapping of the spin wave amplitude in the plane of...

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Bibliographic Details
Published in:Physical review. B 2018-10, Vol.98 (14), p.144430, Article 144430
Main Authors: Loayza, N., Jungfleisch, M. B., Hoffmann, A., Bailleul, M., Vlaminck, V.
Format: Article
Language:English
Subjects:
Amplitudes
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Coplanar waveguides
Diffraction theory
Fresnel diffraction
Magnons
Wave diffraction
Wave propagation
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Summary:The propagation of magnetostatic forward volume waves excited by a constricted coplanar waveguide is studied via inductive spectroscopy techniques. A series of devices consisting of pairs of submicrometer size antennae is used to perform a discrete mapping of the spin wave amplitude in the plane of a 30-nm thin YIG film. We found that the spin wave propagation remains well focused in a beam shape of width comparable to the constriction length and that the amplitude within the constriction displays oscillations, two features which are explained in terms of near-field Fresnel diffraction theory.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.144430