Effect of thickness of Ag layer on the structure and magnetic properties of FePd films

Abstract:

A series of FePd based alloy films were deposited on glass substrates by DC magnetron sputtering. In order to find the role of the Ag layer in disorder-order of FePd film, it was studied that the Ag layer effected on Agx/FePd(67.5nm)(x=3.875、7.75、15.50、31、38.75 nm) and FePd(67.5nm)/Agx(x=7.75、15.50、31nm) films annealed at 600℃ for different time. The results showed that the Ag layer could accelerate phase transition from FCC (face-centered cubic) to FCT (face-centered tetragonal) in films and greatly enhance the coercivity of FePd films. Compared Ag/FePd with FePd/Ag films, some samples of Ag/FePd films have highly preferred orientation. The magnetic easy axis of the crystallites in Ag/FePd film is in-plane of substrate. When the thickness of Ag toplayer is equal to 31 nm, the film has a very large in-plane coercivity of 2.8 kOe and a very low out-of-plane coercivity of 1.04 kOe.