Thickness effect on structural and magnetic properties in Fe49−xPt51Cox (x=0.0, 1.3) thin films

Abstract Structural and magnetic properties of Fe 49− x Pt 51 Co x ( x = 0.0 , 1.3) thin films deposited on quartz substrate with different thickness ranged from 20 to 100 nm annealed at 500 °C were studied. In the cobalt addition films, refined grain size and reduced order parameter accompanied higher magnetization and lower coercivity. High energy product values were obtained in the Co-containing films within the whole thickness range, which are on average 52% larger than that in binary samples. Moderate chemical ordering and refined microstructure are suggested to be two reasonable explanations for the high performance of energy product and good stability of magnetic properties to film thickness.