Effect of ion doping on CuO magnetism

R. A. BORZI; SILVANA JACQUELINE STEWART; R. C. MERCADER; G. PUNTE; G. A. CURUCHET; R. ZYSLER; M. TOVAR

Journal of Applied Physics

Año: 2000 vol. 87 p. 4870 - 4872

0021-8979

We have investigated the magnetism of 0.5 at.% Fe3+-doped CuO samples by Mo¨ssbauerspectroscopy and magnetization studies. The Curie–Weiss-type behavior observed forlow-field-magnetization measurements at temperatures higher than 220 K is interpreted as anuncompensation of moments enhanced by the doping. The results are compared with 1.2 at.%Zn2+-doped CuO magnetization results and previous ones for samples doped with divalent ions.Trivalent ion doping produces an increase in the susceptibility with a peak at TN . The magneticcoupling of Fe2+ ions to the magnetic lattice is found to be about four times stronger than that ofFe3+.