Monte Carlo simulation of Fe-Co amorphous nanoparticles magnetization

MOLINA CONCHA BELÉN; DE BIASI EMILIO; ZYSLER ROBERTO

PHYSICA B - CONDENSED MATTER

ELSEVIER SCIENCE BV

Año: 2008 vol. 403 p. 390 - 393

0921-4526

Magnetization simulations of 3 nm non-interacting Fe–Co ferromagnetic amorphous nanoparticles were made using Metropolis algorithm of Monte Carlo method. The results of core–shell model simulations describe the nanoparticles as a ferromagnetically ordered core and a disordered surface shell. They fairly reproduce the significant features observed in 3 nm Fe–Co–B nanoparticles experimental magnetization measurement at the same Fe–Co composition. They also provide a clear evidence of the role played by the local surface anisotropy and the surface–core exchange interaction in determining the magnetic properties of the nanoparticles.