Monte Carlo study of magnetic nanoparticles adsorbed on halloysite Al2Si2O5(OH)4 nanotubes

作     者：O. M. Sotnikov V. V. Mazurenko A. A. Katanin 

作者机构：Theoretical Physics and Applied Mathematics Department Ural Federal University Mira Street 19 620002 Ekaterinburg Russia Institute of Metal Physics Kovalevskaya Street 18 Ekaterinburg 620990 Russia 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2017年第96卷第22期

页      面：224404-224404页

核心收录：

基　　金：Russian Science Foundation, RSF, (15-12-20021) Russian Science Foundation, RSF 

主　　题：Dipolar interaction Magnetic anisotropy Magnetism Disordered systems Magnetic nanoparticles Nanotubes Heisenberg model Metropolis algorithm Monte Carlo methods 

摘      要：We study properties of magnetic nanoparticles adsorbed on the halloysite surface. For that a distinct magnetic Hamiltonian with a random distribution of spins on a cylindrical surface was solved by using a nonequilibrium Monte Carlo method. The parameters for our simulations, the anisotropy constant, nanoparticle size distribution, saturated magnetization, and geometrical characteristics of the halloysite template, were taken from recent experiments. We calculate the hysteresis loops and temperature dependence of the zero-field-cooling (ZFC) susceptibility, the maximum of which determines the blocking temperature. It is shown that the dipole-dipole interaction between nanoparticles moderately increases the blocking temperature and weakly increases the coercive force. The obtained hysteresis loops (e.g., the value of the coercive force) for Ni nanoparticles are in reasonable agreement with the experimental data. We also discuss the sensitivity of the hysteresis loops and ZFC susceptibilities to the change in anisotropy and dipole-dipole interaction, as well as the 3d-shell occupation of the metallic nanoparticles; in particular we predict larger coercive force for Fe than for Ni nanoparticles.