Evidence of random magnetic anisotropy in ferrihydrite nanoparticles based on analysis of statistical distributions

Autor:	Silva, N. J. O., Amaral, V. S., Carlos, L. D., Rodríguez-González, B., Liz-Marzán, L. M., Berquó, T. S., Banerjee, S. K., Bermudez, V. de Zea, Millán, A., Palacio, F.
Rok vydání:	2007
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.77.134426
Popis:	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. Comment: 6 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0710.0864 Zobrazit plný text záznamu View this record from Arxiv