Magnetic and electrical properties of single-phase multiferroic (1-x)Pb(Zr0.52Ti0.48)O3–xPb(Fe0.5Nb0.5)O3 thin films prepared by sol-gel route

•A sol-gel route is developed for the synthesis of multiferroic (1-x)PZT-xPFN thin films.•Rapid thermal annealing is necessary to stabilize a single-phase perovskite structure.•The films display excellent dielectric and ferroelectric properties.•Films with PFN content higher than 30 % show ferromagnetic behavior at room temperature.•The multiferroic behavior occurs in a concentration range different from bulk ceramics.