Controlled and Reproducible Domain Wall Displacement by Current Pulses Injected into Ferromagnetic Ring Structures

M. Kläui, C. A. F. Vaz, J. A. C. Bland, W. Wernsdorfer, G. Faini, E. Cambril, L. J. Heyderman, F. Nolting, and U. Rüdiger
Phys. Rev. Lett. 94, 106601 – Published 15 March 2005

Abstract

In a combined numerical and experimental study, we demonstrate that current pulses of different polarity can reversibly and controllably displace a magnetic domain wall (DW) in submicrometer permalloy (NiFe) ring structures. The critical current densities for DW displacement are correlated with the specific spin structure of the DWs and are compared to results of micromagnetic simulations including a spin-torque term. Using a notch, an attractive local pinning potential is created for the DW resulting in a highly reproducible spin structure of the DW, critical for reliable current-induced switching.

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  • Received 22 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.106601

©2005 American Physical Society

Authors & Affiliations

M. Kläui1, C. A. F. Vaz2, J. A. C. Bland2,*, W. Wernsdorfer3, G. Faini4, E. Cambril4, L. J. Heyderman5, F. Nolting5, and U. Rüdiger1

  • 1Fachbereich Physik, Universität Konstanz, Universitätsstrasse 10, D-78457 Konstanz, Germany
  • 2Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom
  • 3Laboratoire L. Néel-CNRS, BP 138, 38274 Grenoble, France
  • 4Laboratoire de Photonique et de Nanostructures-CNRS, Route de Nozay, 91460 Marcoussis, France
  • 5Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

  • *Corresponding author. Electronic address: jacb1@phy.cam.ac.uk

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Vol. 94, Iss. 10 — 18 March 2005

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