Magnetic properties of Ni0.5Ag0.5 thin films

Abstract Ni 0.5 Ag 0.5 thin films were prepared by R.F. sputtering. The magnetic properties (saturation magnetization and susceptibility) was measured by means of a Faraday balance in the temperature range 170–715K. The films are made up of fine particles of pure nickel scattered in an amorphous matrix. Below 400K the films are paramagnetic and above they have a superparamagnetic behaviour. We have also shown that the large particle size distribution leads to exchange integral fluctuations.