| 1. |
- Dzhezherya, Yu. I., et al.
(författare)
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Kapitza problem for the magnetic moments of synthetic antiferromagnetic systems
- 2012
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Ingår i: Journal of Experimental and Theoretical Physics. - 1063-7761 .- 1090-6509. ; 115:2, s. 284-288
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Tidskriftsartikel (refereegranskat)abstract
- The dynamics of magnetization in synthetic antiferromagnetic systems with the magnetic dipole coupling in a rapidly oscillating field has been examined. It has been revealed that the system can behave similar to the Kapitza pendulum. It has been shown that an alternating magnetic field can be efficiently used to control the magnetic state of a cell of a synthetic antiferromagnet. Analytical relations have been obtained between the parameters of such an antiferromagnet and an external magnetic field at which certain quasistationary states are implemented.
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| 2. |
- Dzhezherya, Yu I., et al.
(författare)
-
Remagnetization of synthetic antiferromagnetic cells by a magnetic field pulse
- 2013
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Ingår i: Journal of Experimental and Theoretical Physics. - 1063-7761 .- 1090-6509. ; 117:6, s. 1059-1065
-
Tidskriftsartikel (refereegranskat)abstract
- The theory of the dynamic remagnetization of a synthetic antiferromagnetic system and magnetic points located on a magnetic substrate in an external magnetic field has been considered. The energies of the equilibrium states of the system have been calculated. The conditions of switching between equilibrium states have been described. The conditions of applicability of this theory have been formulated. It has been shown that the process of remagnetization can be implemented in an inertialess regime, escaping the long-term relaxation of the system to a new equilibrium position with the use of a special shape of the field signal. The possibility of the reduction of the switching field amplitude by varying the pulse duration has been demonstrated.
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| 3. |
- Vilkov, E. A., et al.
(författare)
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Frequency tuning of the spin-injection radiation in the magnetic contact junction
- 2016
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Ingår i: Journal of communications technology & electronics. - : Maik Nauka/Interperiodica. - 1064-2269 .- 1555-6557. ; 61:9, s. 995-1002
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Tidskriftsartikel (refereegranskat)abstract
- The frequency tuning of the terahertz radiation of spin-injection oscillator based on magnetic contact junction that is formed by contacting ferromagnetic metal layers with different magnetizations is analyzed. Under the current-induced spin injection from one magnetic layer (injector) to another (working) layer, the interval of radiation frequencies is determined by the current density in the magnetic contact, the mismatch angle of the magnetizations of injector and working layer, and the equilibrium spin polarization. The wide-range tuning of terahertz frequencies of the spin-injection radiation can be implemented using variations in the above parameters.
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| 4. |
- Vilkov, E. A., et al.
(författare)
-
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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