Monte Carlo simulation of Fe–Co amorphous nanoparticles magnetization

• Published in: Physica. B, Condensed matter Vol. 403; no. 2; pp. 390 - 393
• Main Authors: Molina Concha, B., De Biasi, E., Zysler, R.D.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2008; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Ferromagnetic nanoparticles; Magnetic properties and materials; Magnetic properties of nanostructures; Magnetization measurements; Monte Carlo simulation; Physics; Surface effects; Magnetization measurements; 75.40.Mg; Ferromagnetic nanoparticles; 75.50.Tt; Surface effects; 75.60.Jk; Monte Carlo simulation; 75.75.+a; Magnetization; Core shell structure; Ferromagnetic materials; Iron alloys; Nanoparticles; Ferromagnetic nanoparticles; Surface effects; Monte Carlo simulation; Magnetization measurements; Monte Carlo methods; 75.50.Tt; 75.40.Mg; 75.75. + a; 75.60.Jk; Anisotropy; Ferromagnetism; Cobalt alloys; Exchange interactions; Transition element alloys
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2007.08.057

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.