Magnetisation, curie temperature and YK angle studies of Cu substituted and non substituted NiZn mixed ferrites
The compositional variation of saturization magnetization and Curie temperature for Ni 1- y- xZn xCu yFe 2O 4 where x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0 for y = 0 and x = 0.0, 0.2, 0.4, 0.6, 0.8 for y = 0.2 have been reported. It is observed that Néel type of spins are favoured in NiFe 2O 4, Zn 0.2Ni 0.8Fe 2O 4, Ni 0.8Cu 0.2Fe 2O 4 and Zn 0.2Ni 0.6Cu 0.2Fe 2O 4. However, in the remaining samples non-collinear spin arrangement is favoured. This is concluded from the computation of YK angles for both the ferrite systems. The Curie temperatures have been evaluated by the technique described by Loria et al. The non-collinear arrangement is also evidenced by the compositional variation of Curie temperatures for both the systems. On addition of copper, the Curie temperatures and magnetization of the NiZn ferrite system are lowered which is attributed to lower magnetic moment for Cu +2.