Magnetic behavior of nanosized cupric oxide

R. A. BORZI; SILVANA JACQUELINE STEWART; R. C. MERCADER; G. PUNTE; F. GARCIA

Journal of Magnetism and Magnetic Materials

Año: 2001 vol. 226 p. 1513 - 1515

0304-8853

The e!ect of the particle size and ball-mill-induced defects on the magnetic properties of cupric oxide has been assessedby magnetic measurements. Nanoparticles with an average strain 0.035 and average crystallite size 9nm show a susceptibility one order of magnitude higher than the starting material. Up to room temperature, instead of the increasing susceptibility found in bulk samples, a Curie}Weiss-like behavior is observed above the ordering temperatureof ca. 230 K.