Ab Initio Calculation of the Gilbert Damping Parameter via Linear Response Formalism

作者：Koedderitzsch Diemo; Mankovsky Sergiy; Ebert Hubert^*

来源：IEEE Transactions on Magnetics, 2013, 49(3): 1041-1046.

DOI：10.1109/TMAG.2012.2230319

• Damping
• magnetic anisotropy
• magnetic devices
• magnetic materials
• magnetic properties
• magnetic resonance
• magnetization
• torque

A Kubo-Greenwood-like equation for the Gilbert damping parameter is presented that is based on the linear response formalism. Its implementation on the basis of the fully relativistic Korringa-Kohn-Rostoker (KKR) band structure method together with the Coherent Potential Approximation (CPA) alloy theory allows application to a wide range of situations. This is demonstrated by results obtained for the alloy system bcc FexCo1-x as well as for a series of alloys of permalloy with transition metals. To account for the thermal displacements of atoms as a scattering mechanism, an alloy-analogy model is introduced. In line with experiment, calculations for Ni correctly describe the rapid change of alpha when small amounts of Cu are introduced substitutionally.

• 出版日期2013-3