Effect of Ta on microstructure and magneto-optical properties of (Fe72Pt28)1−xTax (x=0.00–0.02) alloy films

Abstract The effects of Ta additive and heat treatment temperature on microstructure and magneto-optical properties of polycrystalline (Fe 72 Pt 28 ) 1− x Ta x films are reported. The average grain size of the as-deposited film can be adjusted by the content of Ta addition. During heat treatment, Ta addition is detrimental to the formation of ordered FePt phase. The annealed FePtTa x ( x =0.42 at%) film shows Kerr rotation angle of 0.44° and reflection coefficient of 0.6 in the optimal condition.