Magnetoresistance of Cu-Mn-Al melt-spun ribbons containing the system of interacting ferromagnetic inclusions

Cu-Mn-Al melt-spun ribbons of two compositions were studied to find out the influence of the collective behavior of diluted ferromagnetic nanoparticles on magnetotransport properties. The sample with a lower volume percentage of particles demonstrates magnetic behavior characteristic for the superparamagnetic state while the other one demonstrates ferromagnetic-like ordering. It is shown that the collective behavior of the system in both ribbons correlates with the temperature dependence of magnetoresistance. - Research highlights: → Spin glass-like ordering is provided by the dipolar interaction between particles. → Ferromagnetic-like ordering results from the exchange interaction between particles. → Temperature dependence of magnetoresistance is different for different magnetic states.