We investigate the transport and magnetic properties of ferromagnetic Fe-Al-O and Co-Al-O granular films. A negative linear magnetoresistivity is found at least up to 27 T for Co-Al-O films. The temperature dependence of the magnetization of Fe-Al-O films can be explained in terms of the T 1.5-law for three dimensional spin waves theory, but that of Co-Al-O films does not obey the simple power law expected from this theory. The coercive field of a Co-Al-O film is strongly dependent on temperature.
ASJC Scopus subject areas
- Physics and Astronomy(all)