Anisotropy vs exchange in Fe NPs

Interplay between particle anisotropy and exchange interaction in Fe nanoparticle films.
V. Iannotti, S. Amoruso, G. Ausanio, X. Wang, L. Lanotte, A. C. Barone, G. Margaris, K. N. Trohidou, and D. Fiorani
Phys. Rev. B 83, 214422 (2011) 

Comparison of initial magnetization curves at RT and
10 K, in Fe NP films. Left: experiments. Right: MC simulations.