Goos-Hänchen effect and bending of spin wave beams in thin magnetic films

Journal Article · Mon Dec 15 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4904342· OSTI ID:22395537

Romero-Vivas, J. ^[1]; Dadoenkova, Yu. S.; Dadoenkova, N. N. ^[2]; Lyubchanskii, I. L. ^[2]

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1. Department of Electronic and Computer Engineering, University of Limerick, Limerick (Ireland)
2. Donetsk Physical and Technical Institute of the National Academy of Sciences of Ukraine, 83114 Donetsk (Ukraine)

For magnon spintronic applications, the detailed knowledge of spin wave (SW) beam dispersion, transmission (reflection) of SWs passing through (reflected from) interfaces, or borders or the scattering of SWs by inhomogeneities is crucial. These wave properties are decisive factors on the usefulness of a particular device. Here, we demonstrate, using micromagnetic simulations supported by an analytical model, that the Goos-Hänchen (GH) shift exists for SW reflecting from thin film edge and that with the effect becomes observable. We show that this effect will exist for a broad range of frequencies in the dipole-exchange range, with the magnetization degree of pinning at the film edge as the crucial parameter, whatever its nature. Moreover, we have also found that the GH effect can be accompanied or even dominating by a bending of the SW beam due to the inhomogeneity of the internal magnetic field. This inhomogeneity, created by demagnetizing field taking place at the film edge, causes gradual change of SWs refractive index. The refraction of the SW beams by the non-uniformity of the magnetic field enables the exploration of graded index magnonics and metamaterial properties for the transmission and processing of information at nanoscale.

• OSTI ID: 22395537
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 24 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPUTERIZED SIMULATION
DIPOLES
INTERFACES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIZATION
NANOSTRUCTURES
PROCESSING
REFLECTION
REFRACTION
REFRACTIVE INDEX
SCATTERING
SPIN WAVES
THIN FILMS