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 visualize 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 behavior in three different regimes and calculate the associated energy barriers using the Arrhenius law.
Highlights
Scitation.org/journal/apl smaller than twice the cell size.22 with the current cell size, we find that this singularity is moved far beyond 100 GHz, i.e., much larger than the frequency region of interest (f < 30 GHz)
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 visualize the spatial extension of the internal magnon modes
Summary
Scitation.org/journal/apl smaller than twice the cell size.22 with the current cell size, we find that this singularity is moved far beyond 100 GHz, i.e., much larger than the frequency region of interest (f < 30 GHz). We determine the temperature dependence of the magnon modes and focus on the low frequency edge modes, which are found to display fluctuations associated with switching between C- and S-states, posing an energy barrier.
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