Joule heating and current-induced instabilities in magnetic nanocontacts

A. Kadigrobov, S. I. Kulinich, R. I. Shekhter, M. Jonson, and V. Korenivski
Phys. Rev. B 74, 195307 – Published 7 November 2006

Abstract

We consider the electrical current through a magnetic point contact in the limit of a strong inelastic scattering of electrons. In this limit local Joule heating of the contact region plays a decisive role in determining the transport properties of the point contact. We show that if an applied constant bias voltage exceeds a critical value, the stationary state of the system is unstable, and that periodic, nonharmonic oscillations in time of both the electrical current through the contact and the local temperature in the contact region develop spontaneously. Our estimations show that the necessary experimental conditions for observing such oscillations with characteristic frequencies in the range 108109Hz can easily be met. We also show a possibility to manipulate upon the magnetization direction of a magnetic grain coupled through a point contact to a bulk ferromagnet by exciting the above-mentioned thermal-electric oscillations.

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  • Received 13 June 2006

DOI:https://doi.org/10.1103/PhysRevB.74.195307

©2006 American Physical Society

Authors & Affiliations

A. Kadigrobov1,2, S. I. Kulinich1,3, R. I. Shekhter1, M. Jonson1, and V. Korenivski4

  • 1Department of Physics, Göteborg University, SE-412 96 Göteborg, Sweden
  • 2Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany
  • 3B. I. Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Avenue, 61103 Kharkov, Ukraine
  • 4Nanostructure Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden

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Issue

Vol. 74, Iss. 19 — 15 November 2006

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