Spin Polarization Dynamics of Nonequilibrium Conduction Electrons in Magnetic Junctions
| Autor: | Ansar R. Safin, E. A. Vilkov, M. V. Logunov, S. A. Nikitov, Vladislav N. Korenivskii, S. G. Chigarev, L. A. Fomin, Gennady M. Mikhailov |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Physics Photon Condensed matter physics Spin polarization Magnetic moment Exchange interaction Relaxation (NMR) General Physics and Astronomy Electron 01 natural sciences Ferromagnetism 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics Spin (physics) |
| Zdroj: | Journal of Experimental and Theoretical Physics. 127:1022-1032 |
| ISSN: | 1090-6509 1063-7761 |
| DOI: | 10.1134/s1063776118120105 |
| Popis: | The dynamics of the motion of the magnetic moment averaged over an ensemble of nonequilibrium spin-injected electrons in a ferromagnetic junction is considered with allowance for the exchange interaction, as well as the interaction with an external electromagnetic field and a thermostat. The solution of this problem is important for the experimental development of compact terahertz-band radiation sources. The rate of quantum transitions of electrons with opposite spins, which determine the spin relaxation under the interaction with a thermostat, is calculated within the density matrix formalism. It is shown that two spin-relaxation modes can be implemented that correspond to low- and high-Q precession of spin-nonequilibrium injected electrons. The effect of the characteristic features of spin-flip transitions under the relaxation of the magnetic moment on the emission and absorption of photons with-energy corresponding to the energy of effective exchange splitting of spin subbands is discussed. |
| Databáze: | OpenAIRE |
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