Collective oscillations of the magnetic moments of a chain of spherical magnetic nanoparticles with uniaxial magnetic anisotropy

• Published in: Journal of experimental and theoretical physics Vol. 116; no. 6; pp. 975 - 979
• Main Authors: Dzian, S. A., Ivanov, B. A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-06-2013; Springer
• Subjects: ANISOTROPY; Classical and Quantum Gravitation; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIPOLES; Disorder; DISPERSION RELATIONS; Elementary Particles; MAGNETIC MOMENTS; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; Order; OSCILLATIONS; Particle and Nuclear Physics; PARTICLES; Phase Transition in Condensed System; Physics; Physics and Astronomy; Quantum Field Theory; Relativity Theory; Solid State Physics; SPHERICAL CONFIGURATION; STRONG INTERACTIONS; WEAK INTERACTIONS; Anisotropy Energy; Magnetic Dipole Interaction; Strong Anisotropy; Magnetic Oscillation; Collective Oscillation
• ISSN: 1063-7761; 1090-6509
• DOI: 10.1134/S1063776113060058

Magnetic particles moving freely in a fluid can organize dense phases (3D clusters or linear chains). We analyze the spectrum of magnetic oscillations of a chain of spherical magnetic particles taking into account the magnetic anisotropy of an individual particle for an arbitrary relation between the anisotropy energy and the energy of the dipole interaction of particles. For any relation between these energies, the spectrum contains three branches of collective oscillations: a high-frequency branch and a weakly split doublet of low-frequency branches. The frequency of the high-frequency branch is determined by a stronger interaction, while the frequencies of the low-frequency branches are determined by the weakest interaction. Accordingly, the dispersion is maximal for oscillations formed by the dipole-dipole interaction of particles, which have high frequencies in the case of a strong dipole interaction or low frequencies in the case of a strong anisotropy.