Magnetic phase transitions due to compositional variation across amorphous thin–films

Abstract

The structural and magnetic properties of amorphous thin–films with various CoFeTaB thicknesses were studied to observe magnetic phase transitions due to compositional variation through the CoFeTaB layer. The investigations of the structural properties of amorphous CoFeTaB thin–films were undertaken to confirm layer thickness, interface roughness, and their amorphous structure. Temperature dependent magnetic characterizations were performed to extract Curie temperatures of each thin–film structure, where there is evidence of more than one magnetic transition point. These transition points indicate magnetic phase transitions, which may be attributed to compositional variations across the amorphous CoFeTaB thin– films. Investigation of diffusion process in ferromagnetic thin–films is crucial for the development of spintronic applications.