Dynamics and stability of a linear cluster of spherical magnetic nanoparticles

• Published in: Journal of experimental and theoretical physics Vol. 115; no. 5; pp. 854 - 865
• Main Authors: Dzian, S. A., Ivanov, B. A.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-11-2012; Springer
• Subjects: Classical and Quantum Gravitation; Disorder; Elementary Particles; FLUIDS; MAGNETIC DIPOLES; MAGNETIC MATERIALS; MAGNETIC MOMENTS; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; Order; Particle and Nuclear Physics; PARTICLES; PHASE TRANSFORMATIONS; Phase Transition in Condensed System; Physics; Physics and Astronomy; Quantum Field Theory; Relativity Theory; ROTATION; SOLID CLUSTERS; Solid State Physics; SPHERICAL CONFIGURATION; VAN DER WAALS FORCES; VIBRATIONAL STATES; Magnetic Particle; Acoustic Oscillation; Brillouin Zone; Dipole Interaction; Mode Hybridization
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776112110039

Magnetic particles freely moving in a fluid may organize themselves into dense phases, bulk clusters, or linear chains. The dynamics of particles forming a chain is analyzed theoretically taking into account the magnetic dipole interaction as well as the Van der Waals molecular interaction. The vibrational spectrum has two branches (the magnetic branch associated with the rotation of the magnetic moment of a particle and the elastic branch associated with the displacement of particles). In the case of particles with constant mass density and magnetic moment, which is interesting for applications, these two modes are in fact independent; i.e., the effects of mode hybridization are weak. However, these effects can be manifested for hollow particles. From analysis of the vibrational spectrum, the criterion for the chain stability to a transition to a denser phase is established.