Enhanced Magnetization Density of a Compositionally Modulated CuNi Thin Film

Abstract

The magnetization density, $M$, of a CuNi thin film containing a 30-Å composition modulation has been deduced from ferromagnetic resonance data between 120 and 325°K. The data imply the existence of high-$M$ regions in the modulated film. At 300°K, $M$ is about 200 emu/${\mathrm{cm}}^3$, and increases as the temperature decreases. By 125°K, $M$ is significantly larger than that of pure Ni. After most of the modulation was annealed out, $M$ had decreased by an order of magnitude.