Phonon assisted magnon transmission through nickel at 24 GHz

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Abstract
According to conventional theories of microwave transmission through ferromagnetic metals the transmission of 24 GHz radiation through nickel slabs 5–10 μm thick should be unobservable. Nevertheless, experiments at room temperature have revealed a peak in the transmission of 24 GHz microwaves at FMR using nickel single crystals and annealed polycrystalline foils ca. 8 μm thick. It is proposed that this anomalous energy transport across the specimens at FMR is due to the phonon mode which is generated by magneto-elastic coupling to the resonantly precessing magnetization. The calculations indicate that exchange plays a significant role in determining the intensity and the lineshape of the transmitted signal at FMR.