Magnetic and magnetotransport behavior of granular FexAg100−x thin films

We present magnetic and magnetotransport properties of Fe_xAg_100−x granular thin films prepared by the pulsed laser deposition technique. Increasing the Fe nanoparticles, x, the interactions among them modify the magnetic response from an interacting superparamagnetism to a ferromagnetic-like behavior with a crossover at x = 25. For this value, an extraordinary Hall effect becomes dominant while magnetoresistance decrease. The appearance of in-plane anisotropies are discussed through the study of extraordinary Hall effect.