J. Phys. IV France 08 (1998) Pr2-315-Pr2-318
Magnetic domain behaviour of Cu-ferrite doped with small quantities of Cd or Be ionsI. Jacyna-Onyszkiewicz1 and P. Kamasa2
1 Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland
2 Research Institute for Solid State Physics, Hungarian Academy of Science, 1525 Budapest, Hungary
The temperature dependences of the ac-initial susceptibility Xac(T) of a Cu1-xMexFe2O4 ferrospinel system with Me = Cd/Be (size effect) and x = 0.05 were performed in 300 - 1100 K range. A remarkable thermal treatment cycling effects were observed. The tamperatures of blocking effect, Hopkinson effect, spontaneous spin-reorientation phase transition and Curie temperature were determined. The irreversible magnetic domain behaviour of Cu-Cd/Be ferrite system with single domain and multidomain particles were explained on the basis of cooperative Jahn-Teller effect (accompanied by ionic diffusion), magnetic anisotropy of this system and properties of magnetic particles.
© EDP Sciences 1998