Spin wave resonance in thin films and in bulk samples of FeNi invar alloys
1990
Abstract The spin wave resonance (SWR) at 9.2 GHz has been investigated in single layer films ( d ⋍200 nm) and multi layer films of FeNi. The variation of the spin wave parameters as a function of Ni concentration is determined at room temperature. For a Fe 20 Ni 80 single layer and a Fe 65 Ni 35 multi layer the temperature dependence has been studied in the range of 4 to 300 K. Besides, the SWR has been measured in annealed bulk samples of Fe 63 Ni 37 at 9.2 and 33.8 GHz as a function of temperature. From the SWR spectra of the bulk and film samples quantitative values of the effective magnetization, the g factor, and the exchange stiffness parameter have been determined.
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