High-frequency magnetization dynamics of individual atomic-scale magnets

S. Krause, A. Sonntag, J. Hermenau, J. Friedlein, and R. Wiesendanger
Phys. Rev. B 93, 064407 – Published 4 February 2016

Abstract

The magnetization dynamics of individual nanomagnets is studied by spin-polarized scanning tunneling microscopy, combining real-time telegraphic noise analysis with pump-probe schemes. A transition between two Arrhenius regimes is observed as a function of temperature. The switching rates at high temperature are found to be orders of magnitude lower than expected from the extrapolation from the low-temperature regime. A four-state hopping model of magnetization reversal is developed to interpret the experimental results in terms of nucleation, annihilation, and propagation.

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  • Received 14 September 2015
  • Revised 11 January 2016

DOI:https://doi.org/10.1103/PhysRevB.93.064407

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Krause*, A. Sonntag, J. Hermenau, J. Friedlein, and R. Wiesendanger

  • Department of Physics, University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

  • *skrause@physnet.uni-hamburg.de
  • asonntag@physnet.uni-hamburg.de

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Issue

Vol. 93, Iss. 6 — 1 February 2016

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