Magnetic properties of clusters of supracolloidal magnetic polymers with central attraction

Autor: Sofia S. Kantorovich, Pedro A. Sánchez, Vladimir S. Zverev, Ekaterina V. Novak, Elena S. Pyanzina
Rok vydání: 2020
Předmět:
Materials science
INTERACTING PARTICLES
FOS: Physical sciences
02 engineering and technology
Magnetic particle inspection
Condensed Matter - Soft Condensed Matter
01 natural sciences
Suspension (chemistry)
Molecular dynamics
VORTEX STRUCTURES
LANGEVIN DYNAMICS
INITIAL SUSCEPTIBILITY
STOCKMAYER INTERACTION
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
DEGREES OF FREEDOM (MECHANICS)
TOPOLOGY
Langevin dynamics
Computer Science::Distributed
Parallel
and Cluster Computing
Topology (chemistry)
MAGNETIC PARTICLE
010302 applied physics
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics
MAGNETIC POLYMERS
Magnetic moment
Materials Science (cond-mat.mtrl-sci)
VORTEX FLOW
MAGNETIC PROPERTIES
021001 nanoscience & nanotechnology
Condensed Matter Physics
Electronic
Optical and Magnetic Materials
Vortex
SUPRACOLLOIDAL MAGNETIC POLYMERS
MAGNETIC MOMENTS
Chemical physics
LANGEVIN DYNAMICS SIMULATIONS
CROSSLINKING
Soft Condensed Matter (cond-mat.soft)
Magnetic nanoparticles
MOLECULAR DYNAMICS
POLYMERS
0210 nano-technology
ROTATIONAL DEGREES OF FREEDOM
Zdroj: J Magn Magn Mater
Journal of Magnetism and Magnetic Materials
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2019.166025
Popis: Supracolloidal magnetic polymers (SMPs) are structures made by crosslinking magnetic particles. In this work, using Langevin dynamics simulations, we study the zero-field magnetic properties of clusters formed in suspensions of SMPs with different topologies -- chains, rings, X and Y -- that interact via Stockmayer potential. We find that the presence of central attraction, resulting in the formation of large compact clusters, leads to a dramatic decrease of the suspension initial susceptibility, independently from SMP topology. However, the largest decrease corresponds to chain-like SMPs with strongly interacting particles. This is due to the higher rotational degrees of freedom of SMPs with such topology, which allows the particles to reorganise themselves inside the clusters in such a way that their magnetic moments form energetically advantageous vortex structures with negligible net magnetic moments.
Comment: International Conference on Magnetic Fluids - ICMF 2019
Databáze: OpenAIRE
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