High coercivity Co-ferrite thin films on SiO2 (1 0 0) substrate

Co-ferrite thin films were prepared by sputtering and subsequent annealing. Magnetic properties were strongly dependent on annealing temperature, annealing duration and film thickness. A coercivity as high as 9.3 kOe was achieved in the Co-ferrite film with a thickness of 50 nm. A small film thickness can restrict the formation of large particles. The high coercivity was associated with a nano-structure and lattice strain