Thermal Stoner-Wohlfarth model for magnetodynamics of single domain nanoparticles
- Author(s)
- Deniz Mostarac, Andrey A. Kuznetsov, Santiago Helbig, Claas Abert, Pedro A. Sánchez, Dieter Suess, Sofia S. Kantorovich
- Abstract
We present the thermal Stoner-Wohlfarth (tSW) model and apply it in the context of molecular dynamics simulations. The model is validated against an ensemble of immobilized, randomly oriented uniaxial particles (solid superparamagnet) and a classical dilute ferrofluid for different combinations of anisotropy strength and magnetic field/moment coupling, at a fixed temperature. We compare analytical and simulation results to quantify the viability of the tSW model in reproducing the equilibrium properties (with and without dipole-dipole interactions) and dynamic properties (without dipole-dipole interactions) of magnetic soft matter systems. We show that if the anisotropy of a particle is more than five times higher than the thermal fluctuations, the tSW model is applicable and efficient. This approach allows one to consider the interplay between Néel and Brownian relaxation, often neglected in the fixed point-dipole representation-based magnetic soft matter theoretical investigations.
- Organisation(s)
- Computational and Soft Matter Physics, Physics of Functional Materials
- External organisation(s)
- Sapienza University of Rome, Delft University of Technology
- Journal
- Physical Review B
- Volume
- 111
- No. of pages
- 14
- ISSN
- 2469-9950
- DOI
- https://doi.org/10.48550/arXiv.2408.06136
- Publication date
- 01-2025
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103043 Computational physics, 103015 Condensed matter
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e7233f47-48dd-4f7d-9424-2dd09b82dd8e