Current-induced inverse population of spin subbands in magnetic junctions

Gulyaev, Yu. V.; Zilberman, P. E.; Крикунов, А. И.; Panas, A. I.; Éphshteĭn, É. M.

doi:10.1134/s002136400703006x

Cited by 38 publications

(25 citation statements)

References 11 publications

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“…In the presence of the current flow, a magnetic junction that is formed by two magnetic films with nanosized thickness may exhibit emission of electro magnetic waves [1][2][3][4]. Note that different emission effects and different radiation frequencies are possible [5].…”

Section: Introductionmentioning

confidence: 99%

Observation of the spin-injection terahertz emission in planar ferromagnetic two-layer structures

Gulyaev

Zilberman

Malikov

et al. 2012

J. Commun. Technol. Electron.

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The spin injection emission of the system that consists of a nonmagnetic conducting rod and two layer planar heteroepitaxial structure formed by thin metal and magnetite films is experimentally studied. The electromagnetic emission in the terahertz range is demonstrated for the first time due to the creation of the nonequilibrium population of the spin energy subbands (relatively low current densities of about 10 5 A/cm 2 are needed at room temperature).

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Section: Introductionmentioning

confidence: 99%

Observation of the spin-injection terahertz emission in planar ferromagnetic two-layer structures

Gulyaev

Zilberman

Malikov

et al. 2012

J. Commun. Technol. Electron.

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“…Due to this effect an excess spin density is accumulated in the point-contact region in conjunction with a concentration of the current. Under certain conditions such an accumulation is accompanied by an inverse population of the spin-split electron energy levels [10][11][12]. If this is the case, we show that electron-photon scattering results in the generation of coherent photons, which leads to an enhancement of the electromagnetic field propagating through the point contact.…”

Section: Introductionmentioning

confidence: 88%

Microwave-induced spin-flip scattering of electrons in point contacts

Kadigrobov

Shekhter

Aronov³

et al. 2011

Low Temperature Physics

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We investigate resonant interaction of conduction electrons with an electromagnetic field that irradiates a point contact between a ferromagnetic and a normal metal in the presence of a strong magnetic field of order 1 T. We show that electron spin-flips caused by resonant absorption and stimulated emission of photons result in a sharp peak in the magnetic-field dependence of the point-contact resistance. The height of the peak is shown to be directly proportional to the net rate of energy transfer to the electromagnetic field in the point contact due to absorption and stimulated emission of photons.

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“…Due to this effect an excess spin density is accumulated in the point-contact region in conjunction with a concentration of the current. Under certain conditions such an accumulation is accompanied by an inverse populations of the spin-split energy levels [10,11,15,16]. If this is the case, we show that electron-photon scattering results in generation of coherent photons, which leads to an enhancement of the electromagnetic field propagating through the point contact.…”

Section: "Exchange-orbital" Interaction Between Free Electron Spin Anmentioning

confidence: 86%

“…It follows that if = 2 / I ω all "hot" electrons are in resonance with the electromagnetic field, and hence in a ferromagnetic metal with an inverse population of electrons (which can be created by injection of a spin-polarized current [10,11,15,16]), stimulated emission of light due to transitions of electrons from filled states in the upper band to empty states in the lower band is possible.…”

Section: "Exchange-orbital" Interaction Between Free Electron Spin Anmentioning

confidence: 99%

Photon generation in ferromagnetic point contacts

Kadigrobov

Shekhter

Jonson

2012

Low Temperature Physics

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We show theoretically that a significant spin accumulation can occur in electric point contacts between two ferromagnetic electrodes with different magnetizations. Under appropriate conditions an inverse population of spin-split electronic levels results in stimulated emission of photons in the presence of a resonant electromagnetic field. The intensity of the emitted radiation can be several orders of magnitude higher than in typical semiconductor laser materials for two reasons.(1) The density of conduction electrons in a metal point conduct is much larger than in semiconductors. (2) The strength of the coupling between the electron spins and the electromagnetic field that is responsible for the radiative spin-flip transitions is set by the magnetic exchange energy and can therefore be very large as suggested by Kadigrobov et al. [Europhys. Lett. 67, 948 (2004)

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Current-induced inverse population of spin subbands in magnetic junctions

Cited by 38 publications

References 11 publications

Observation of the spin-injection terahertz emission in planar ferromagnetic two-layer structures

Observation of the spin-injection terahertz emission in planar ferromagnetic two-layer structures

Microwave-induced spin-flip scattering of electrons in point contacts

Photon generation in ferromagnetic point contacts

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