Time-Resolved X-Ray Microscopy of Spin-Torque-Induced Magnetic Vortex Gyration

Markus Bolte, Guido Meier, Benjamin Krüger, André Drews, René Eiselt, Lars Bocklage, Stellan Bohlens, Tolek Tyliszczak, Arne Vansteenkiste, Bartel Van Waeyenberge, Kang Wei Chou, Aleksandar Puzic, and Hermann Stoll
Phys. Rev. Lett. 100, 176601 – Published 30 April 2008
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Abstract

Time-resolved x-ray microscopy is used to image the influence of alternating high-density currents on the magnetization dynamics of ferromagnetic vortices. Spin-torque-induced vortex gyration is observed in micrometer-sized permalloy squares. The phases of the gyration in structures with different chirality are compared to an analytical model and micromagnetic simulations, considering both alternating spin-polarized currents and the current’s Oersted field. In our case the driving force due to spin-transfer torque is about 70% of the total excitation while the remainder originates from the current’s Oersted field. This finding has implications to magnetic storage devices using spin-torque driven magnetization switching and domain-wall motion.

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  • Received 29 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.176601

©2008 American Physical Society

Authors & Affiliations

Markus Bolte1,*, Guido Meier1, Benjamin Krüger2, André Drews1, René Eiselt1, Lars Bocklage1, Stellan Bohlens2, Tolek Tyliszczak3, Arne Vansteenkiste4, Bartel Van Waeyenberge4,5, Kang Wei Chou5, Aleksandar Puzic5, and Hermann Stoll5

  • 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany
  • 2I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
  • 3Advanced Light Source, LBNL, Berkeley, 94720 California, USA
  • 4Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, 9000 Ghent, Belgium
  • 5Max Planck Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany

  • *mbolte@physik.uni-hamburg.de

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Issue

Vol. 100, Iss. 17 — 2 May 2008

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