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- Vilkov, E. A., et al.
(författare)
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Spin Polarization Dynamics of Nonequilibrium Conduction Electrons in Magnetic Junctions
- 2018
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Ingår i: Journal of Experimental and Theoretical Physics. - : Pleiades Publishing. - 1063-7761 .- 1090-6509. ; 127:6, s. 1022-1032
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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