Hot electrons in magnetic point contacts as a photon source

A. M. Kadigrobov, R. I. Shekhter, S. I. Kulinich, M. Jonson, O. P. Balkashin, V. V. Fisun, Yu G. Naidyuk, I. K. Yanson, S. Andersson, V. Korenivski

Research output: Contribution to journalArticle

Abstract

We propose to use a point contact between a ferromagnetic and a normal metal in the presence of a magnetic field for creating a large inverted spin population of hot electrons in the contact core. The key point of the proposal is that when these hot electrons relax by flipping their spin, microwave photons are emitted, with a frequency tunable by the applied magnetic field. While point contacts are an established technology, their use as a photon source is a new and potentially very useful application. We show that this photon emission process can be detected by means of transport spectroscopy and demonstrate stimulated emission of radiation in the 10-100 GHz range for a model point contact system using a minority-spin ferromagnetic injector. These results can potentially lead to new types of lasers based on spin injection in metals. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Original languageEnglish
Article number023007
JournalNew Journal of Physics
Volume13
Issue number-
DOIs
Publication statusPublished - Feb 2011

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hot electrons
photons
minorities
stimulated emission
injectors
magnetic fields
metals
proposals
electric contacts
injection
microwaves
radiation
spectroscopy
lasers

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Kadigrobov, A. M., Shekhter, R. I., Kulinich, S. I., Jonson, M., Balkashin, O. P., Fisun, V. V., ... Korenivski, V. (2011). Hot electrons in magnetic point contacts as a photon source. New Journal of Physics, 13(-), [023007]. https://doi.org/10.1088/1367-2630/13/2/023007
Kadigrobov, A. M. ; Shekhter, R. I. ; Kulinich, S. I. ; Jonson, M. ; Balkashin, O. P. ; Fisun, V. V. ; Naidyuk, Yu G. ; Yanson, I. K. ; Andersson, S. ; Korenivski, V. / Hot electrons in magnetic point contacts as a photon source. In: New Journal of Physics. 2011 ; Vol. 13, No. -.
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Kadigrobov, AM, Shekhter, RI, Kulinich, SI, Jonson, M, Balkashin, OP, Fisun, VV, Naidyuk, YG, Yanson, IK, Andersson, S & Korenivski, V 2011, 'Hot electrons in magnetic point contacts as a photon source', New Journal of Physics, vol. 13, no. -, 023007. https://doi.org/10.1088/1367-2630/13/2/023007

Hot electrons in magnetic point contacts as a photon source. / Kadigrobov, A. M.; Shekhter, R. I.; Kulinich, S. I.; Jonson, M.; Balkashin, O. P.; Fisun, V. V.; Naidyuk, Yu G.; Yanson, I. K.; Andersson, S.; Korenivski, V.

In: New Journal of Physics, Vol. 13, No. -, 023007, 02.2011.

Research output: Contribution to journalArticle

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AU - Kadigrobov, A. M.

AU - Shekhter, R. I.

AU - Kulinich, S. I.

AU - Jonson, M.

AU - Balkashin, O. P.

AU - Fisun, V. V.

AU - Naidyuk, Yu G.

AU - Yanson, I. K.

AU - Andersson, S.

AU - Korenivski, V.

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AB - We propose to use a point contact between a ferromagnetic and a normal metal in the presence of a magnetic field for creating a large inverted spin population of hot electrons in the contact core. The key point of the proposal is that when these hot electrons relax by flipping their spin, microwave photons are emitted, with a frequency tunable by the applied magnetic field. While point contacts are an established technology, their use as a photon source is a new and potentially very useful application. We show that this photon emission process can be detected by means of transport spectroscopy and demonstrate stimulated emission of radiation in the 10-100 GHz range for a model point contact system using a minority-spin ferromagnetic injector. These results can potentially lead to new types of lasers based on spin injection in metals. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

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Kadigrobov AM, Shekhter RI, Kulinich SI, Jonson M, Balkashin OP, Fisun VV et al. Hot electrons in magnetic point contacts as a photon source. New Journal of Physics. 2011 Feb;13(-). 023007. https://doi.org/10.1088/1367-2630/13/2/023007