Ferromagnetic resonance of magnetostatically coupled shifted chains of nanoparticles in an oblique magnetic field

Abstract

We investigate the ferromagnetic resonance characteristics of a magnetic dimer composed of two shifted parallel chains of iron nanoparticles coupled by dipolar interactions. The latter are treated beyond the point-dipole approximation taking into account the finite size and arbitrary shape of the nano-elements and arbitrary separation. The resonance frequency is calculated as a function of the amplitude of the applied magnetic field and the resonance field is computed as a function of the direction of the applied field, varied both in the plane of the two chains and perpendicular to it. We highlight a critical value of the magnetic field which marks a state transition that should be important in magnetic recording media.

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

“…In that study, this could be useful to characterize, inter alia, the magnetostatic interaction between the chains and to investigate the critical shift as a function of the applied field (restricted to a dimer). 315 FePt-Au NPs were also the subject of a study with FMR. The author of that study notes that a relatively small amount of material is capable of providing a good signal to noise ratio.…”

Magnetization reversals in magnetosome linear-chain assemblies extracted from magnetotactic bacteria: an experimental and micromagnetic simulation study

“…20,21 To facilitate such applications, a better understanding of the fundamental magnetic characteristics of linear-chain assemblies of magnetosomes is necessary. Indeed, to date, the number of studies on the effect of magnetostatic interaction between individual chains on the magnetization reversal of magnetotactic-bacteria extracted 'magnetosome' linear-chain assemblies 22 is limited.…”