The temperature-dependent magnetic properties of artificial rare-earth, free-magnetic nanostructures are investigated for magnetic cooling. We consider two-phase nanocomposites, where 2 nm nanoclusters of cobalt are embedded in a Ni 67Cu 33 matrix. Several composite films were produced by cluster deposition. The average Co nanocluster size can be tuned by varying the deposition conditions. Isothermal magnetization curves were measured at various temperatures 150 K < T < 340 K in steps of 10 K. The isothermal entropy changes δS were calculated using the Maxwell relation. The entropy changes measured were, -δS 0.15 J/kgK in a field change of 1 T at 260 K and 0.72 J/kgK in a field change of 7 T at 270 K.
ASJC Scopus subject areas
- Physics and Astronomy(all)