Temperature dependence of switching fields of single 3 nm cobalt nanoparticles.

Authors :: Thirion, C.
Wernsdorfer, W.
Jamet, M.
Dupuis, V.
Me´linon, P.
Pe´rez, A.
Mailly, D.
Source :: Journal of Applied Physics. 5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p7062. 3p. 3 Graphs.
Publication Year :: 2002
Abstract: We study the temperature dependence of the magnetization switching fields of single nanoparticles with an improved micro-superconducting quantum interference device (SQUID) technique, that allows us to perform measurements independently of the critical superconducting temperature of the SQUID. A simplified Néel-Brown model that describes the magnetization reversal by thermal activation over a single anisotropy barrier is compared to measurements on a 3 nm cobalt nanoparticle embedded in a niobium matrix. [ABSTRACT FROM AUTHOR]