Monte Carlo Simulation Of Fe-co Amorphous Nanoparticles Magnetization

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. © 2007 Elsevier B.V. All rights reserved.4032-3390393De Biasi, E., Ramos, C.A., Zysler, R.D., Romero, H., (2002) Phys. Rev. B, 65, p. 144416Zysler, R.D., Romero, H., Ramos, C.A., De Biasi, E., Fiorani, D., (2003) J. Magn. Magn. Mater., 266, p. 233Kachkachi, H., Ezzir, A., Noguès, M., Tronc, E., (2000) Eur. Phys. J. B, 14, p. 681Winkler, E., Zysler, R.D., Vasquez Mansilla, M., Fiorani, D., (2005) Phys. Rev. B, 72, p. 132409Iglesias, O., Labarta, A., (2001) Phys. Rev. B, 63, p. 184416Iglesias, O., Labarta, A., (2004) Physica B, 343, p. 286De Biasi, E., Ramos, C.A., Zysler, R.D., Fiorani, D., (2006) Physica B, 372, p. 345Chikazumi, S., (1964) Physics of Magnetism, , Krieger Publ. Co., Malabar, FL (Chapter 4)Molina Concha, B., Zysler, R.D., Romero, H., (2006) Physica B, 384, p. 274De Biasi, E., Ramos, C.A., Zysler, R.D., Romero, H., Fiorani, D., (2005) Phys. Rev. B, 71, p. 10440