2003 Volume 44 Issue 4 Pages 653-656
Co–Pt alloy films were electrodeposited from a novel bath which was designed in the present study containing the ammonia solution and ammonium tartrate as complexing agents. The Co–Pt deposited films were prepared with wide alloy compositions ranging from 16.5 at% Pt to 56.8 at% Pt by changing the bath concentration and current density. The structures of these deposited films were analyzed by means of XRD and HRTEM. The results indicated that the crystallographic structure of Co–Pt deposited film are the ε-Co solid solution when the platinum content in deposited film is below 31.1 at%, the mixture of ε-Co solid solution and (α-Co, Pt) face centered-cubic solid solution when the platinum in the deposited film is ranging from 35.7 at% to 45.7 at%, and the (α-Co, Pt) face centered-cubic solid solution when the platinum in the deposited film is ranging from 51.1 at% to 56.8 at%. Moreover, the ordered fct phase (L10) was detected with the help of XRD from Co–Pt deposited film with 51.1 at% Pt which was annealed in vacuum with pressure no lower 10−5 Pa for 60 min at the temperature of 450°C.