Theoretical study of Co nanostructures with magnetic properties

F. MÉLICA; O. E. LINAREZ PÉREZ; D. ARCINIEGAS JAIMES

Pucón

Workshop; XVI Seminario Intensivo en Materia Condensada y Física Estádistica - SIMAFE; 2021

USACH

Because of the increasing development of nanoscience and nanotechnology, a large number of applications for usual materials have been found at the nanoscale, taking their properties significantly from those shown on a massive scale due to the high surface/volume ratio and quantum confinement [1].On the other hand, cobalt structures have shown to be ideal for a wide variety of applications such as magnetic sensors [2], among others. Because of this, it is of great interest to study and predict the influence of geometric parameters on the magnetic properties of Co nanostructures, which in turn will determine additional potential applications.In this work, micromagnetic simulations for isolated as well as hexagonal arrays of Co nanodots were carried out with the OOMMF software [3]. The results were analyzed according to nanodot geometry (circular and square), diameter or side (40 nm and 100 nm), number of nanodots in the array (1 to 7 elements), and with respect to the external magnetic field whichwas applied in two directions, along the x-axis (in-plane) and the z-axis (out-of-plane). This study allowed us to understand the effects of these geometrical variables on the magnetic properties and the reversal modes of magnetization observed.As an example, Figure 1 shows hysteresis loops and snapshots for the magnetic dipoles at a fixed magnetic field value of 0 mT for an isolated circular (a) and square (b) Co nanodot with 100 nm diameter. As it can be seen, there are mainly vortex-type magnetic states with different chirality, which would be of interest in some technological applications [4].