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Effective Magnetic Monopoles and Universal Conductance Fluctuations

Kjetil M. D. Hals, Anh Kiet Nguyen, Xavier Waintal, and Arne Brataas
Phys. Rev. Lett. 105, 207204 – Published 11 November 2010
Physics logo See Synopsis: Fingerprinting magnetic monopoles

Abstract

The observation of isolated positive and negative charges, but not isolated magnetic north and south poles, is an old puzzle. Instead, evidence of effective magnetic monopoles has been found in the abstract momentum space. Apart from Hall-related effects, few observable consequences of these abstract monopoles are known. Here, we show that it is possible to manipulate the monopoles by external magnetic fields and probe them by universal conductance fluctuation measurements in ferromagnets with strong spin-orbit coupling. The observed fluctuations are not noise, but reproducible quasiperiodic oscillations as a function of magnetization direction, a novel Berry phase fingerprint of the magnetic monopoles.

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  • Received 30 July 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.207204

© 2010 The American Physical Society

Synopsis

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Fingerprinting magnetic monopoles

Published 19 November 2010

A new probe of magnetic monopoles in momentum space is proposed.

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Authors & Affiliations

Kjetil M. D. Hals1, Anh Kiet Nguyen1, Xavier Waintal2, and Arne Brataas1

  • 1Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway
  • 2SPSMS-INAC-CEA, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France

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Issue

Vol. 105, Iss. 20 — 12 November 2010

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