Tunable magnetization dynamics in disordered FePdPt ternary alloys: Effects of spin orbit coupling

摘要

The magnetization dynamics of disordered Fe_(0.5)(Pd_(1-x)Pt_x)_(0.5) alloy films was studied by time-resolved magneto-optical Kerr effect and ferromagnetic resonance. The intrinsic Gilbert damping parameter α_O and the resonance linewidth change linearly with the Pt atomic concentration. In particular, the induced in-plane uniaxial anisotropy constant K_U also increases for x increasing from 0 to 1. All these results can be attributed to the tuning effect of the spin orbit coupling. For the disordered ternary alloys, an approach is proposed to control the induced in-plane uniaxial anisotropy, different from conventional thermal treat methods, which is helpful to design and fabrications of spintronic devices.