Spin injection maser

Viglin, N. A.; Ustinov, V. V.; Осипов, В. В.

doi:10.1134/s002136400715009x

Cited by 21 publications

(8 citation statements)

References 10 publications

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“…Of particular interest is the case when a highly nonequilibrium spin population can be created and used to produce radiation (emission of photons). Spin injection into semiconductors has been reported to result in the emission of circularly polarized light [5,6] and is used to measure the spin polarization of the injected current. In the case when the electron transition emitting a photon is between two levels that are spinsplit by an external field [6], however, the semiconductor's energy gap plays no role-the spin splitting produces two subbands within the conduction band.…”

mentioning

confidence: 99%

“…Spin injection into semiconductors has been reported to result in the emission of circularly polarized light [5,6] and is used to measure the spin polarization of the injected current. In the case when the electron transition emitting a photon is between two levels that are spinsplit by an external field [6], however, the semiconductor's energy gap plays no role-the spin splitting produces two subbands within the conduction band. Based on this observation, some of us have proposed a new concept for a solid-state THz laser based on a population inversion of spin-split levels in a ferromagnetic metal [7].…”

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confidence: 99%

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Stimulated emission and absorption of photons in magnetic point contacts

et al. 2012

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Stimulated emission and absorption of photons in magnetic point contacts

et al. 2012

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“…We see the inversion of spin population P (R) < 0 may be achieved. Such a possibility was discussed previously in a number of works [2,5,6].…”

Section: Introductionmentioning

confidence: 85%

Spin-polarized current in ferromagnetic rod-to-film structure

Chigarev¹,

Épshteǐn²,

Gulyaev³

et al. 2010

Preprint

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Properties are discussed of a ferromagnetic junction of the type "rod contacting with film". Very high current density of the order of 10 9 A/cm 2 may be achieved in the contact region. We show it can lead to inversion of population of the spin energy subbands. Spin injection depends strongly on the direction of the current (forward or backward). We prepared experimentally a rod-to-film structure and investigated high density current flowing through it. Current dependent radiation has been observed by means of a THz receiver. In particular, the radiation becomes different for forward and backward currents. It shows the radiation includes not only heating but also non-thermal (spin-injection) effects.

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“…( 3) gives an equation for the spin polarization P which is substantially nonlinear as follows from Eqs. ( 2), (7) and (8). Besides the explicit linear-fractional dependence of Q(P ) and D(P ) coefficients on P , the partial mobilities and diffusion constants of a degenerate electron gas (metal) depend in general on the Fermi quasilevels of the spin subbands and, subsequently, on the partial densities n±, which, in their turn, are expressed via spin polarization P (see Eq.…”

Section: The Model and Main Equationsmentioning

confidence: 99%

Current-driven spin injection from a probe to a ferromagnetic film

Chigarev,

Epshtein,

Gulyaev

et al. 2009

Preprint

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The distribution is calculated of the electron spin polarization under current-driven spin injection from a probe to a ferromagnetic film. It is shown that the main parameters determining difference of the spin polarization from the equilibrium value are the current density and the spin polarization of the probe material, while the relation between the probe diameter and the spin diffusion length influences the result very weakly, to a certain extent. A possibility is shown of reaching inverse population of the spin subbands at distances from the probe boundary comparable with the spin diffusion length.

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Spin injection maser

Cited by 21 publications

References 10 publications

Stimulated emission and absorption of photons in magnetic point contacts

Stimulated emission and absorption of photons in magnetic point contacts

Spin-polarized current in ferromagnetic rod-to-film structure

Current-driven spin injection from a probe to a ferromagnetic film

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