Enhancement of Coercivity in the P-Doped FePt Nanocrystalline Film Prepared by Electrodeposition.

In this work, the P-doped FePt films were successfully prepared by electrodeposition and subsequent annealing. Varied NaH2PO2•H2O was added to adjust the content of P in the FePtP film. Crystalline structure, morphologies in micro- and nano-scales, and magnetic property of FePtP films were investigated. The P doping significantly enhances the coercivity in the FePtP films. High coercivity of 23.8 kOe is achieved in the FePtP film with 22 at% P. The P doping promotes the formation of L10 FePt phase. Nonmagnetic Fe2P and PtP2 are formed by the P doping and segregate at grain boundary, which reduces the exchange coupling between magnetic particles. These two factors result in the enhancement of coercivity. [ABSTRACT FROM AUTHOR]