Nucleation of Magnetization Reversal in Individual Nanosized Nickel Wires

W. Wernsdorfer, B. Doudin, D. Mailly, K. Hasselbach, A. Benoit, J. Meier, J. -Ph. Ansermet, and B. Barbara
Phys. Rev. Lett. 77, 1873 – Published 26 August 1996
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Abstract

The switching of the magnetization of single Ni wires with diameters 40-100 nm was measured at temperatures between 0.13 and 6 K. The angular dependence of the switching field was studied for several wire diameters. Repetitive measurements allow us to obtain histograms of the switching field values. For the smallest diameters, the measurements of the probability of reversal revealed a thermally activated switching following an Arrhenius law with an activation volume much smaller than the volume of the wire.

  • Received 3 January 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.1873

©1996 American Physical Society

Authors & Affiliations

W. Wernsdorfer1,2, B. Doudin3, D. Mailly4, K. Hasselbach1, A. Benoit1, J. Meier3, J. -Ph. Ansermet3, and B. Barbara2

  • 1Centre de Recherches sur les Très Basses Températures, CNRS, BP166, 38042 Grenoble Cedex 9, France
  • 2Laboratoire de Magnétisme Louis Néel, CNRS, BP166, 38042 Grenoble Cedex 9, France
  • 3Institut de Physique Expérimentale, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
  • 4Laboratoire de Microstructure et Microélectronique, CNRS, 196 Av. H. Ravera, 92220 Bagneux, France

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Vol. 77, Iss. 9 — 26 August 1996

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