The influence of alloying Fe59Pt41 thin films with Co on their magnetic and microstructural properties

This study investigates how the addition of Co to a Fe59Pt41 alloy with compositions in the range of Fe59Pt41–Co59Pt41 affects the crystallographic ordering temperatures and magnetic properties of sputter-deposited films. Introducing Co into the (Fe1–xCox)59Pt41 film affects the activation energy of atomic migration and grain growth, thus leading to a higher annealing temperature of the L10 phase formation. At a Co concentration of x = 0.2, the saturation magnetization was maximum, at 1,480 emu/ cm3, and the (Fe0.8Co0.2)59Pt41 film exhibited a coercivity of about 4 kOe