The Influence of Thickness on the Magnetic Properties of Nanocrystalline Thin Films: A Computational Approach
| Autor: | Francy Nelly Jiménez-García, Elisabeth Restrepo-Parra, J.D. Agudelo-Giraldo |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
monte carlo method
Work (thermodynamics) Materials science General Computer Science dipolar interaction 02 engineering and technology superparamagnetism 01 natural sciences lcsh:QA75.5-76.95 Theoretical Computer Science symbols.namesake 0103 physical sciences Coupling (piping) coercivity Anisotropy 010302 applied physics Zeeman effect nano-granular thin films Condensed matter physics Applied Mathematics Exchange interaction Coercivity 021001 nanoscience & nanotechnology blocking temperature surface anisotropy Dipole Modeling and Simulation symbols lcsh:Electronic computers. Computer science 0210 nano-technology Superparamagnetism |
| Zdroj: | Computation, Vol 9, Iss 45, p 45 (2021) Computation Volume 9 Issue 4 |
| ISSN: | 2079-3197 |
| DOI: | 10.3390/computation9040045 |
| Popis: | A study of the magnetic behaviour of polycrystalline thin films as a function of their thickness is presented in this work. The grain volume was kept approximately constant in the virtual samples. The model includes the exchange interaction, magneto-crystalline anisotropy, surface anisotropy, boundary grain anisotropy, dipolar interaction, and Zeeman effect. The thickness-dependence of the critical temperature, blocking temperature, and irreversibility temperature are presented. Surface anisotropy exerts a great influence at very low thicknesses, producing a monodomain regime. As the thickness increases, the dipolar interaction produces a coupling in-plane of single domains per grain which favours superparamagnetic states. At higher thicknesses, the effects of the in-plane anisotropy produced by dipolar interaction and surface anisotropy decrease dramatically. As a result, the superparamagnetic states present three-dimensional local anisotropies by the grain. |
| Databáze: | OpenAIRE |
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