A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is
Langevin dynamics has been used to study different aspects of the transition from ferromagnetism to superparamagnetism when reducing the size of thin magnetic single-domain nanoparticles with in-plane uniaxial anisotropy for observation times in the order of a few nanoseconds. It is found that nonuniformities in the magnetization, usually ignored for such small particles, favor thermal relaxation. Quantitatively, the size range over which the transition occurs is found to move roughly 1 nmdoi:10.1103/physrevb.65.224406 fatcat:xx75iaaa5rddxezs6usq4dkg2y