Abstract

We present a simple but attractive tool to describe and model the spin states of single molecule magnets. It is presented through a generalized Landau-Lifshitz-Gilbert equation with bias-dependent couplings that can be externally controlled. We provide a complete account of the various magnetic couplings [magnetic anisotropy, exchange, Dzyaloshinskii-Moriya interactions (DMI), damping, and magnetic noise's correlations] within a dimer of localized moments. The inversion symmetry breaking, ensued by the bias potential, induces a DMI between the magnetic elements that can be tuned accordingly. Through a calculation of the evolution of the spin, we conclude that such DMI is the dominant interaction during the reversal process. Along with the prescription to describe the time evolution of the spin moments, our results provide a qualitatively complete and integrated picture of various systems of interest in nanomagnetism. © 2023 American Physical Society.