Temperature dependence of the domain wall depinning in magnetic hard-soft composites

摘要

We study the temperature and composition dependence of the depinning field H_(d) in magnetic hard-soft nanocomposite by finite temperature Monte Carlo simulation for a model of the composites. As the amount of the soft magnetic material is increased, the depinning field increases, exhibits a maximum, and then decreases. As the temperature is increased, the position of this maximum increases. At the same time the overall magnitude of the depinning field decreases. We discuss the implication of our result on the energy product of nanocomposites of hard and soft magnets. The decrease of the switching field with temperature suggests that it is important to use a hard magnet component with a large anisotropy field.