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

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.

keywords

SMALL-PARTICLE SYSTEMS; STRUCTURAL MODEL; RELAXATION; SPIN; SUSCEPTIBILITY; SPECTROSCOPY; FERRITIN; BEHAVIOR; SURFACE; GLASS

subject category

Physics

authors

Silva, NJO; Amaral, VS; Carlos, LD; Rodriguez-Gonzalez, B; Liz-Marzan, LM; Berquo, TS; Banerjee, SK; Bermudez, VD; Millan, A; Palacio, F

our authors

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".