Analysis of magnetic irreversibity at room temperaturein CuO nanostructured.

A. E. BIANCHI; G. PUNTE

Buenos Aires

Workshop; X Latin American Workshop on Magnetism, Magnetic Materials and their Applications.; 2013

Cupric oxide (CuO) has monoclinic crystal structure being unique among the 3d transition-metal monoxides and departs considerably from the simple NaCl-type structure common to most of them. The crystal structure of CuO can be viewed as made up of two types of zigzag Cu?O?Cu chains running along the [10¯ 1 ] and [101] directions. The system undergoes two successive magnetic transitions; one to an incommensurate antiferromagnetic (AF) phase between TN1=230 K and TN2=213 K, and a second one to a commensurate AF phase below TN2. The magnetic properties in nanoestructured material and one-dimensional magnetic nanoestructures like as nanowire, and nanotubes, usually differ from those of their bulk behavior due to surface and size effects.  In the present work, 3-D and 1-D magnetic nanostructures were manufactured by ball-milling and annealed Cu at 450 C respectively. The dependence of the magnetic moment with the applied magnetic field (0 ≤ H ≤ 20 kOe) showed for all the samples the presence at RT of hysteresis loops.