Abstract
We study the composition and temperature dependence of the spin wave resonance in NiFe films, where, x is 40% or below, with a thickness of 100 nm using a temperature variable broadband ferromagnetic resonance (FMR) spectroscopy. From the uniform FMR mode, the saturation magnetization and the Gilbert damping are measured, and using the first perpendicular standing spin wave mode, the exchange stiffness constant is determined. At lower temperatures, we measure an increase of both and A, while α shows a very weak temperature dependence. We find that follows perfectly Bloch’s law, while A is best described by a T 2 law. Additionally, we measure a linear increase in and A with the increase of Fe content in films, while α strongly decreases. The compositional variation of α and A can be ascribed to the increase of in Fe-rich films. Furthermore, we estimate the exchange length () in NiFe films. We find that is temperature independent, however, a strong decrease of is measured in Fe-rich films. This reduction is inversely proportional to .
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