Gilbert damping tensor within the breathing Fermi surface model: anisotropy and non-locality
In magnetization dynamics, the Gilbert damping α is often taken as a parameter. We report on a theoretical investigation of α , taking into account crystal symmetries, spin–orbit coupling and thermal reservoirs. The tensor ${\boldsymbol \alpha}$ is calculated within the Kamberský breathing Fermi-sur...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2014-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/16/1/013032 |
| Summary: | In magnetization dynamics, the Gilbert damping α is often taken as a parameter. We report on a theoretical investigation of α , taking into account crystal symmetries, spin–orbit coupling and thermal reservoirs. The tensor ${\boldsymbol \alpha}$ is calculated within the Kamberský 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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| ISSN: | 1367-2630 |