Abstract:
The edge and surface antiferromagnetic properties of the
ABO3 perovskite-type nanoparticle and their components
(A, B and O) are investigated through the Effective Field
Theory developed by Kaneyoshi. It is found that the Edge
AntiFerroMagnetism (EAFM) causes a decrease in the Curie
temperature and separation in the magnetizations.
However, the Surface AntiFerroMagnetism (SAFM) causes a
compensation behaviour (TComp = 1.23) in the total
magnetisation of the ABO3 perovskite-type nanoparticle.
The magnetisation of the central B component has been
affected by the edge antiferromagnetism more strongly
than by the surface antiferromagnetism. Moreover,
coercivity (Hc) and remanence magnetizations (Mr)
decrease for the EAFM, but they increase for the SAFM.
Triple hysteresis behaviour is obtained for the SAFM.
Therefore, it is suggested that there is a strong relationship
between the compensation behaviour and the triple
hysteresis behaviour.