Observation of a Goos-Hänchen-like Phase Shift for Magnetostatic Spin Waves

In optics, a light beam experiences a spatial shift in the beam plane upon total internal reflection. This shift is usually referred to as the Goos-Hänchen shift. When dealing with plane waves, it manifests itself as a phase shift between an incoming and reflected wave that depends on the wave vecto...

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Bibliographic Details
Published in:Physical review letters 2018-09, Vol.121 (13), p.137201-137201, Article 137201
Main Authors: Stigloher, J, Taniguchi, T, Körner, H S, Decker, M, Moriyama, T, Ono, T, Back, C H
Format: Article
Language:English
Subjects:
Ferrous alloys
Light beams
Magnetic alloys
Magnons
Mathematical models
Phase shift
Plane waves
Reflected waves
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Summary:In optics, a light beam experiences a spatial shift in the beam plane upon total internal reflection. This shift is usually referred to as the Goos-Hänchen shift. When dealing with plane waves, it manifests itself as a phase shift between an incoming and reflected wave that depends on the wave vector component along the interface. In the experiments presented here, plane spin waves are excited in a 60-nm-thick Permalloy film and propagate towards the edge of the film. By means of time-resolved scanning Kerr microscopy, we are able to directly detect a phase shift between the incoming and reflected wave. With the help of a numerical model, we show that this phase shift naturally occurs for spin waves in the dipolar regime.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.137201