Spin Dynamics of B2 and L2₁−Ordered Co₂FeAl_0.5Si_0.5 Heusler Alloy Films

Measurements of magnetization precession are performed for L2₁ and B2−ordered Co₂FeAl_0.5Si_0.5 full Heusler alloy films using the time−resolved magneto-optical Kerr effect technique in the out-of-plan configuration. Dependence of the precession frequency on the external magnetic field can be fitted by the Landau–Lifshitz–Gilbert equation. The chirp parameters are close to each other for the L2₁ and B2 structures, and decrease with the external magnetic field increasing. The relaxation rate of the B2−ordered film is smaller than that of the L2₁ one.