Magnetic and FMR Study on CoFe$_{2}$O$_{4}$/ZnFe$_{2}$O$_{4}$ Bilayers

Abstract

CoFe 2 O 4 /ZnFe 2 O 4 bilayers were deposited by the pulsed laser deposition technique on amorphous fused quartz substrate at substrate temperatures of 350 ºC and in oxygen pressure of 0.16 mbar. The films were studied after ex-situ annealing for 2 hrs in air at various temperatures up to 650 ºC. The magnetic properties of the bilayer were studied at 300 K and at 10 K. Ferromagnetic resonance was carried out at x-band frequencies at room temperature. It was found that as a result of annealing, the diffusion between Co-ferrite and Zn ferrite starts around 350 o C and leads to a large line width system having magnetization, which remains undetected by FMR.