期刊
NEW JOURNAL OF PHYSICS
卷 16, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/16/1/013032
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- Functionality of Oxide Interfaces [Sonderforschungsbereich 762]
In magnetization dynamics, the Gilbert damping alpha is often taken as a parameter. We report on a theoretical investigation of alpha, taking into account crystal symmetries, spin-orbit coupling and thermal reservoirs. The tensor alpha is calculated within the Kambersky breathing Fermi-surface model. The computations are performed within a tight-binding electronic structure approach for the bulk and semi-infinite systems. Slater-Koster parameters are obtained by fitting the electronic structure to first-principles results obtained within the multiple-scattering theory. We address the damping tensor for the bulk and surfaces of the transition metals Fe and Co. The role of various contributions are investigated: intra-and interband transitions, electron and magnetic temperature as well as surface orientation. Our results reveal a complicated non-local, anisotropic damping that depends on all three thermal reservoirs.
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