Enhancing ferromagnetic resonance absorption for very thin insulating magnetic films with spin plasmonics

We consider enhancing the ferromagnetic resonance (FMR) absorption of very thin insulating magnetic films by placing it on top of a dielectric. We find that the signal is enhanced by at least an order of magnitude due to a new nonreciprocal interface resonance that is a mixture of the magnetic surfa...

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Bibliographic Details
Published in:Journal of applied physics 2015-05, Vol.117 (18)
Main Author: Chui, S. T.
Format: Article
Language:English
Subjects:
ABSORPTION
Adaptive control
BRILLOUIN EFFECT
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Damping
DIELECTRIC MATERIALS
Dielectrics
DIFFUSION LENGTH
FERRITE GARNETS
Ferromagnetic materials
FERROMAGNETIC RESONANCE
Gadolinium
GADOLINIUM COMPOUNDS
Gadolinium-gallium garnet
GALLIUM OXIDES
Group velocity
INTERFACES
IRON OXIDES
LAYERS
LINE WIDTHS
Magnetic films
Magnetic permeability
MAGNETIC SURFACES
MAGNETIC SUSCEPTIBILITY
Photonics
Plasmonics
Resonance absorption
SPIN
SUBSTRATES
THIN FILMS
Yttrium
YTTRIUM COMPOUNDS
Yttrium-iron garnet
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Summary:We consider enhancing the ferromagnetic resonance (FMR) absorption of very thin insulating magnetic films by placing it on top of a dielectric. We find that the signal is enhanced by at least an order of magnitude due to a new nonreciprocal interface resonance that is a mixture of the magnetic surface plasmon mode and a wave guide mode. This resonance occurs over a wide range of thicknesses of the dielectric that is still much less than the wavelength and is made possible by the negative magnetic susceptibility of the magnetic layer. The line width of absorption is reduced by an order of magnitude less than the Gilbert damping parameter. At some frequency, the group velocity of this resonance is negative. Experimentally, very thin yttrium iron garnet (YIG) films are grown on a Gadolinium Gallium Garnet (GGG) substrate which can be considered the dielectric. Our model applies to experiments performed in the YIG/GGG system. Indeed, our picture resolves the disagreement on the magnitude of the spin diffusion lengths obtained with the FMR and the Brillouin scattering techniques. It also provides for a way to make new adaptive thin film miniaturized photonic nonreciprocal devices with low loss.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4919745