Exchange interaction effect of TbCo/FePt bilayers

Abstract Interlayer exchange coupling in dc-magnetron sputtered Tb 29.6 Co 70.4 /FePt bilayers with different annealing temperatures of the FePt film have been investigated. The dependence of ordering degree on perpendicular magnetic properties of the FePt film was studied. The Tb 29.6 Co 70.4 /FePt film has high perpendicular coercivity and high saturated magnetization about 7.5 kOe, and 302 emu/cm 3 , respectively as the substrate temperature is 500 °C and annealing at 500 °C for 30 min. It also shows a strong exchange coupling between this FePt layer and Tb 29.6 Co 70.4 layer. We also examined the interface wall energy in the exchange coupled Tb 29.6 Co 70.4 /FePt double layers.