Monte Carlo study of magnetic nanoparticles adsorbed on halloysite Al2Si2O5(OH)4 nanotubes
| Autor: | O. M. Sotnikov, Vladimir V. Mazurenko, Andrey A. Katanin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Spins Condensed matter physics Monte Carlo method Nanoparticle 02 engineering and technology engineering.material Coercivity 021001 nanoscience & nanotechnology 01 natural sciences Halloysite Magnetization 0103 physical sciences engineering Magnetic nanoparticles 010306 general physics 0210 nano-technology Anisotropy |
| Zdroj: | Physical Review B. 96 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.96.224404 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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