Room temperature ferromagnetism in laser ablated Zn ferrite thin films

摘要

Nanocrystalline ZnFe_2O_4 was synthesized using sol-gel method. The room temperature ferromagnetic behavior was observed in ZnFe_2O_4 thin films fabricated by pulsed laser deposition (PLD) technique. The ZnFe_2O_4 nanoparticles and target material used for the fabrication of thin films was observed to have paramagnetic behavior at room temperature. The possible ferromagnetic behavior observed in ZnFe_2O_4 thin films has been explained in terms of random distribution of Zn~(2+) and Fe~(3+) ions at tetrahedral (A) and octahedral [B] sites. The blocking temperature T_B was observed in the case of both nanoparticles and thin films.