Phys. Rev. Lett. 87, 137205 (2001) [4 pages]Direct Investigation of Superparamagnetism in Co Nanoparticle FilmsReceived 7 May 2001; published 10 September 2001 A direct probe of superparamagnetism was used to determine the complete anisotropy energy distribution of Co nanoparticle films. The films were composed of self-assembled lattices of uniform Co nanoparticles of 3 or 5 nm in diameter, and a variable temperature scanning-SQUID microscope was used to measure temperature-induced spontaneous magnetic noise in the samples. Accurate measurements of anisotropy energy distributions of small volume samples will be critical to magnetic optimization of nanoparticle devices and media. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.137205
DOI:
10.1103/PhysRevLett.87.137205
PACS:
75.50.Tt, 05.40.Ca, 65.80.+n, 75.20.-g
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