Localized excitation of magnetostatic surface spin waves in yttrium iron garnet by shorted coaxial probe detected via spin pumping and rectification effect

We demonstrate the localized excitation and dc electrical detection of magnetostatic surface spin waves (MSSWs) in yttrium iron garnet (YIG) by a shorted coaxial probe. Thin films of NiFe and Pt are patterned at different regions onto a common bulk YIG substrate. A shorted coaxial probe is used to e...

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Bibliographic Details
Published in:Journal of applied physics 2015-04, Vol.117 (15)
Main Authors: Soh, Wee Tee, Peng, Bin, Ong, C. K.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
EXCITATION
FERRITE GARNETS
FERROMAGNETIC RESONANCE
HALL EFFECT
IRON OXIDES
MICROWAVE RADIATION
NICKEL
PROBES
PUMPING
SPIN
SPIN WAVES
SUBSTRATES
SURFACES
THIN FILMS
YTTRIUM COMPOUNDS
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Summary:We demonstrate the localized excitation and dc electrical detection of magnetostatic surface spin waves (MSSWs) in yttrium iron garnet (YIG) by a shorted coaxial probe. Thin films of NiFe and Pt are patterned at different regions onto a common bulk YIG substrate. A shorted coaxial probe is used to excite spin precession locally near various patterned regions. The dc voltages across the corresponding regions are recorded. For excitation of the Pt regions, the dc voltage spectra are dominated by the spin pumping of MSSWs from YIG, where various modes can be clearly distinguished. For the NiFe region, it is also found that spin pumping from MSSWs generated in YIG dominated the spectra, indicating that the spin pumped currents are dissipated into charge currents via the inverse Spin Hall effect (ISHE) in NiFe. For all regions, dc signals from YIG MSSWs are observed to be much stronger than the ferromagnetic resonance (FMR) uniform mode, likely due to the nature of the microwave excitation. The results indicate the potential of this probe for microwave imaging via dc detection of spin dynamics in continuous and patterned films.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4918668