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      Magnon spintronics

      Author(s): , , ,
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      Journal: Nature Physics
      Publisher: Springer Nature

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          Skyrmions on the track.

          Albert Fert, Vincent Cros, João Sampaio (2013)
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            Current-induced spin orientation of electrons in semiconductors

            M.I. Dyakonov, V.I. Perel (1971)
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              Bose-Einstein condensation of quasi-equilibrium magnons at room temperature under pumping.

              S. O. Demokritov, V. E. Demidov, O. Dzyapko … (2006)
              Bose-Einstein condensation is one of the most fascinating phenomena predicted by quantum mechanics. It involves the formation of a collective quantum state composed of identical particles with integer angular momentum (bosons), if the particle density exceeds a critical value. To achieve Bose-Einstein condensation, one can either decrease the temperature or increase the density of bosons. It has been predicted that a quasi-equilibrium system of bosons could undergo Bose-Einstein condensation even at relatively high temperatures, if the flow rate of energy pumped into the system exceeds a critical value. Here we report the observation of Bose-Einstein condensation in a gas of magnons at room temperature. Magnons are the quanta of magnetic excitations in a magnetically ordered ensemble of magnetic moments. In thermal equilibrium, they can be described by Bose-Einstein statistics with zero chemical potential and a temperature-dependent density. In the experiments presented here, we show that by using a technique of microwave pumping it is possible to excite additional magnons and to create a gas of quasi-equilibrium magnons with a non-zero chemical potential. With increasing pumping intensity, the chemical potential reaches the energy of the lowest magnon state, and a Bose condensate of magnons is formed.
              Article 0 comments Cited 362 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Title: Nature Physics
                Abbreviated Title: Nat Phys
                Publisher: Springer Nature
                ISSN (Print): 1745-2473
                ISSN (Electronic): 1745-2481
                Publication date Created: June 2 2015
                Publication date (Print): June 2 2015
                Volume: 11
                Issue: 6
                Pages: 453-461
                Article
                DOI: 10.1038/nphys3347
                SO-VID: 7a005829-596a-43cf-aed3-2c54447b6993
                Copyright © © 2015
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