Magnetic and magnetoresistive properties of nanostructured Au-NiFe films

Measurements of magnetization, magnetoresistance and ferromagnetic resonanc e were carried out at various temperatures, on as-deposited and annealed sa mples of granular films of Au-0.7(NiFe)(0.3). It was found that the as-depo sited films exhibit a superparamagnetic-like behavior and a negative magnet oresistance up to a temperature of 120 K. Samples annealed at 673 K for 30 min exhibit a ferromagnetic behavior up to 300 K. The ferromagnetic resonan ce measurements show isotropic magnetic properties for the as-deposited fil ms and a significant anisotropy in the field-depended magnetization for the annealed films. (C) 1999 Elsevier Science B.V. All rights reserved.