Abstract
We adapt the tight-binding linear muffin-tin orbital (TB-LMTO) method to the torque-correlation model for the Gilbert damping constant α and perform the first-principles calculation for disordered transition metal alloys, Fe-Ni and Fe-Pt systems, within the framework of the CPA. Quantitatively, the calculated α values are about one-half of the experimental values, whereas the variations in the Fermi level dependence of α are much larger than these discrepancies. As expected, we confirm in the (Fe-Ni) 1-XPt X and FePt systems that Pt atoms certainly enhance owing to their large spin-orbit coupling. For the disordered alloys, we find that decreases with increasing chemical degree of order in a wide range.
Original language | English |
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Article number | 084701 |
Journal | journal of the physical society of japan |
Volume | 81 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2012 Aug |
Keywords
- CPA
- First-principles calculation
- Gilbert damping constant
- LMTO
- Landau-Lifshitz-Gilbert equation
- Spin relaxation
- Spintronics
ASJC Scopus subject areas
- Physics and Astronomy(all)