Dzyaloshinskii–Moriya Interaction induced hysteresis loop shift in perpendicularly magnetized triangular nanodot

Abstract In-depth understanding of magnetization reversal mechanism in perpendicularly magnetized nanodots in the presence of anti-symmetric exchange interaction, namely, Dzyaloshinskii–Moriya Interaction (DMI) is crucial for the development of energy efficient magnetic storage devices. Using micromagnetic simulation study, we investigate the magnetization reversal mechanism under the influence of DMI in individual non-interacting perpendicularly magnetized equilateral triangular nanodot of side length 128 nm and thickness 1 nm. Our results indicate a monotonic decrease in the coercive field with increase in the strength of DMI and the chirality induced nucleation of magnetization reversal from the oblique side edges where the sign of the DMI determines the chirality. Interestingly, by introducing an additional in-plane magnetic field along parallel to one of the sides of the triangle, a unique loop shift is observed and direction of the field determines the preferential nucleation of the reversal at the specific side edge. These results are useful in designing magnetic nanostructures where enegry efficient magnetization reversal needs to be achieved.