Magnetic properties and amorphous-to-nanocrystalline transformation by thermal treatments in Fe 84.3 Si 4 P 3 B 8 Cu 0.7 amorphous thin films

•High-BS alloy, prepared in thin films form.•As-prepared films display low coercivity, comparable to rapidly quenched ribbons.•Furnace annealed films show even lower coercivity while retaining a high saturation.•On annealing, a fully nanocrystalline state is achieved in thin films.