Journal of Low Temperature Physics

, Volume 147, Issue 3–4, pp 505–515 | Cite as

Universality in Voltage-driven Nonequilibrium Phase Transitions

Article

We consider the nonequilibrium ferromagnetic transition of a mesoscopic sample of a resistive Stoner ferromagnet coupled to two paramagnetic leads. The transition is controlled by either the lead temperature T or the transport voltage V applied between the leads. We calculate the T and V dependence of the magnetization. For systems with a flat density of states we find as an exact result that even at finite bias the magnetization does not depend on the position along the sample axis, although the charge density and other quantities do vary. This may be relevant for possible spintronics applications. In addition, we establish a generalized control parameter in terms of T and V which allows for a universal description of the temperature- and voltage-driven transition.

PACS Numbers

73.23.-b 75.10.-b 85.75.-d 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Johann Kroha
    • 1
  • Michael Arnold
    • 1
  • Beate Griepernau
    • 1
    • 2
  1. 1.Physikalisches InstitutUniversität BonnBonnGermany
  2. 2.Center for BioinformaticsUniversität des SaarlandesSaarbrückenGermany

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