NANOCLUSTERED FILMS AND NANOWIRES

摘要

Among the magnetic nanostructures, granular (or nanoclustered) films, which represent nanoinclusions of ferromagnetic material (Co, Fe, Ni) in dia - (f.e.Cu) or paramagnetic (f.e.Re) matrix, are extremely promising. Originally, the interest in inhomogeneous films, formed from alloys of transition metals of the iron group with Cu, arose from the possibility of applying these materials as substitutes for various, currently used, conventional, magnetoresistive sensors, which are based on permalloy transducers. In comparison with the latter, these inhomogeneous, granular alloy films are far more promising owing to the fact that they possess, under certain conditions, an isotropic giant magnetoresistance (GMR), In addition to significantly lower noise; this latter property is due to the absence of domain walls in these materials which is contrary to the situation for ferromagnetic alloys. However, quite recently, granular coatings have also come to be regarded as a material for super high-density magnetic recording. In this context, a comprehensive investigation of these granular films becomes highly appropriate.