Abstract
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 e-Co solid solution when the platinum content in deposited film is below 31.1 at%, the mixture of e-Co solid solution and (a-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 ατ%. Moreover, the ordered fct phase (L1 0 ) 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 60min at the temperature of 450°C.
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