Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 13, Pages 2874-2877Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2874
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Cantilever magnetometry with moment resolution better than 10(4) mu (B) 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 1 mu (B) Hz(-1/2). 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.
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