Magnetic relaxation in finite two-dimensional nanoparticle ensembles

Abstract

We study the slow phase of thermally activated magnetic relaxation in finite two-dimensional ensembles of dipolar interacting ferromagnetic nanoparticles whose easy axes of magnetization are perpendicular to the distribution plane. We develop a method to numerically simulate the magnetic relaxation for the case that the smallest heights of the potential barriers between the equilibrium directions of the nanoparticle magnetic moments are much larger than the thermal energy. Within this framework, we analyze in detail the role that the correlations of the nanoparticle magnetic moments and the finite size of the nanoparticle ensemble play in magnetic relaxation.

arXiv comment21 pages, 4 figures

References in corpus (3)

• Monte Carlo simulation with time step quantification in terms of Langevin dynamics
• Integral Relaxation Time of Single-Domain Ferromagnetic Particles
• Magnetic irreversibility and relaxation in assembly of ferromagnetic nanoparticles

Cited by in corpus (13)

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• AC susceptibility as a tool to probe the dipolar interaction in magnetic nanoparticles
• Rapidly driven nanoparticles: Mean first-passage times and relaxation of the magnetic moment
• Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field
• Magnetization reversal in isolated and interacting single-domain nanoparticles
• Effective collective barrier for magnetic relaxation in frozen ferrofluids
• Mean first-passage times for an ac-driven magnetic moment of a nanoparticle
• Dipolar interactions and thermal stability of two-dimensional nanoparticle arrays
• Elementary transitions and magnetic correlations in two-dimensional disordered nanoparticle ensembles
• Magnetic Relaxation in Two Dimensional Assembly of Dipolar Interacting Nanoparticles
• Magnetic Properties of 2-Dimensional Dipolar Squares: Boundary Geometry Dependence
• Dipolar interaction effects in the thermally activated magnetic relaxation of two-dimensional nanoparticle ensembles