Magnetic Dissipation and Fluctuations in Individual Nanomagnets Measured by Ultrasensitive Cantilever Magnetometry

B. C. Stipe, H. J. Mamin, T. D. Stowe, T. W. Kenny, and D. Rugar
Phys. Rev. Lett. 86, 2874 – Published 26 March 2001
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Abstract

Cantilever magnetometry with moment resolution better than 104μB was used to study individual nanomagnets. By using the fluctuation-dissipation theorem to interpret measurements of field-induced cantilever damping, the low frequency spectral density of magnetic fluctuations could be determined with resolution better than 1μBHz1/2. Cobalt nanowires exhibited significant magnetic dissipation and the associated magnetic fluctuations were found to have 1/f frequency dependence. In individual submicron rare-earth alloy magnets, the dissipation/fluctuation was very small and not distinguishable from that of a bare silicon cantilever.

  • Received 12 July 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.2874

©2001 American Physical Society

Authors & Affiliations

B. C. Stipe1, H. J. Mamin1, T. D. Stowe2, T. W. Kenny2, and D. Rugar1

  • 1IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
  • 2Departments of Applied Physics and Mechanical Engineering, Stanford University, Stanford, California 94305-4021

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Vol. 86, Iss. 13 — 26 March 2001

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