The effect of confinement on thermally induced fluctuations in nanomagnets

Abstract

We study the magnetization dynamics in nanomagnets excited by stochastic magnetic fields to mimic temperature in a micromagnetic framework. The effect of confinement arising from the finite size of the structures is investigated, and we visualise the spatial extension of the internal magnon modes. Furthermore, we determine the temperature dependence of the magnon modes, and focus specifically on the low frequency edge modes, which are found to display fluctuations associated with switching between C- and S-states, thus posing an energy barrier. We classify this fluctuating behaviour in three different regimes, and calculate the associated energy barriers using the Arrhenius law.

6 pages, 6 figures

References in corpus (4)

• Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
• Extensive degeneracy, Coulomb phase and magnetic monopoles in an artificial realization of the square ice model
• Spectral analysis of topological defects in an artificial spin-ice lattice
• Thermally induced magnetic relaxation in square artificial spin ice

Cited by in corpus (10)

• Topological Kinetic Crossover in a Nanomagnet Array
• Mesoscopic magnetic systems: from fundamental properties to devices
• Multiple energy-scales in vertex-frustrated mesospin systems
• Temperature induced collapse of spin dimensionality in magnetic metamaterials
• Thermal excitations within and among mesospins in artificial spin ice
• Texture fluctuations and emergent dynamics in coupled nanomagnets
• Modelling nanomagnet vertex dynamics through Coulomb charges
• Emergent tri-criticality in magnetic metamaterials
• Magnetic texture control in ion-implanted metamaterials
• Co-existing magnetization reversal mechanisms in shakti spin ice systems