Influence of magnetic fields on spin-mixing in transition metals
| Autor: | Michael Haag, Manfred Fähnle, Christian Illg |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Physical Review B. 90 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.90.134410 |
| Popis: | In a relativistic description of a real solid the crystal wave functions are never pure but spin-mixed functions. As a direct result of the spin-mixing, scattering mechanisms, which are in principal diagonal in spin-space, as for example the deformation potential part of the electron-phonon scattering potential, may lead to spin flips. Spin-mixing thereby affects damping and lifetimes in the fast and ultrafast regime of magnetization dynamics. The average spin-mixing appears as an important parameter in many models, the most prominent being the Elliott-Yafet model of spin relaxation. The application of an external magnetic field, a laser-field, or a Faraday-field induced by a laser may be considered as a source of magnetic field in a sample. Therefore we will discuss the influence of a homogeneous applied magnetic field on the average spin-mixing calculated in the framework of spin-density-functional theory. It is shown that even high fields do not significantly change the spin-mixing in $3d$ transition metals. Therefore the related dynamics are unaffected, which is in accordance with the experimental data on ultrafast demagnetization's dependence on light polarization. |
| Databáze: | OpenAIRE |
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