First-principles calculations for Gilbert damping constant at finite temperature

We propose a first-principles calculation method for the Gilbert damping constants alpha at finite temperature. alpha is described by the torque correlation model in which the electronic structure is computed by the tight-binding linear muffin-tin orbital method. We include the finite-temperature effect as the transverse spin fluctuation in the disordered local moment picture within the coherent potential approximation. Applying the present method to bcc-Fe and L1(0)-FePt, we demonstrate this temperature-dependent alpha. By comparing our calculated results with experimental results, we find the calculated values are less than half of the experimental values, reflecting the characteristics of the torque correlation model.

Automated summary

In this study, we propose a method for calculating the Gilbert damping constants at finite temperature and apply it to two materials. By comparing our calculated results with experimental values, we observe a discrepancy, which reflects the characteristics of the torque correlation model.