Optical determination of the exchange stiffness constant in an iron garnet

Abstract

Brillouin light scattering measurements were performed in the backscattering geometry on a Bi-substituted rare earth iron garnet. We observed two different peaks, one attributed to a surface spin wave in the dipole-exchange regime. The other is referred to as a backscattering magnon mode, because the incident light in this case is scattered backward by exchange-dominated spin wave inside the material. We propose a method to estimate the exchange stiffness constant from the frequency of the backscattering magnon mode. The obtained value is comparable with the previously reported values for Y${}_3$Fe${}_5$O${}_{12}$.

arXiv comment11 pages, 6figures

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• The building blocks of magnonics
• Measurements of the exchange stiffness of YIG films by microwave resonance techniques
• Magnon-phonon coupling unmasked: a direct measurement of magnon temperature
• Determination of exchange constants of Heusler compounds by Brillouin light scattering spectroscopy: application to Co${}_2$MnSi
• Surface plasmon-mediated nanoscale localization of laser-driven sub-THz spin dynamics in magnetic dielectrics
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Cited by in corpus (5)

• Observation of evanescent spin waves in the magnetic dipole regime
• Simultaneous measurement of the exchange parameter and saturation magnetization using propagating spin waves
• Fast acquisition of spin-wave dispersion by compressed sensing
• Spin wave resonance in yttrium iron garnet stripe domains
• Magnetic resonance frequency of two-sublattice ferrimagnet with magnetic compensation temperature