Abstract
The temperature dependences of the ac-initial susceptibility X ac (T) of a Cu 1-x Me x Fe 2 O 4 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 temperatures 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.
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