Evidence of random magnetic anisotropy in ferrihydrite nanoparticles based on analysis of statistical distributions
authors Silva, NJO; Amaral, VS; Carlos, LD; Rodriguez-Gonzalez, B; Liz-Marzan, LM; Berquo, TS; Banerjee, SK; Bermudez, VD; Millan, A; Palacio, F
nationality International
journal PHYSICAL REVIEW B
keywords SMALL-PARTICLE SYSTEMS; STRUCTURAL MODEL; RELAXATION; SPIN; SUSCEPTIBILITY; SPECTROSCOPY; FERRITIN; BEHAVIOR; SURFACE; GLASS
abstract We show that the magnetic anisotropy energy of antiferromagnetic ferrihydrite depends on the square root of the nanoparticles' volume, using a method based on the analysis of statistical distributions. The size distribution was obtained by transmission electron microscopy, and the anisotropy energy distributions were obtained from ac magnetic susceptibility and magnetic relaxation. The square root dependence corresponds to random local anisotropy, whose average is given by its variance, and can be understood in terms of the recently proposed single phase homogeneous structure of ferrihydrite.
publisher AMER PHYSICAL SOC
issn 1098-0121
year published 2008
volume 77
issue 13
digital object identifier (doi) 10.1103/PhysRevB.77.134426
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000255457200079
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journal impact factor 3.575
5 year journal impact factor 3.511
category normalized journal impact factor percentile 70.187
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