We study the influence of the surface on the hysteresis behaviour of nanoparticles with core/shell morphology at an atomic level. We use a model that explicitly takes into account the dynamics of the core, interface and surface regions using the Metropolis Monte Carlo simulation algorithm. The presence of uncompensated spins (Nu) and the surface spins' canting strongly influence the magnetic response of antiferromagnetic nanoparticles. The strength of the surface anisotropy in this case determines the behaviour of the temperature dependence of the coercive field. In ferrimagnetic nanoparticles the magnetization and coercivity depend on the details of the surface.
展开▼
机译：我们研究了地面对纳米颗粒的滞后行为对原子水平的核心/壳形态的影响。我们使用模型，明确地考虑了使用Metropolis Monte Carlo仿真算法的核心，接口和曲面区域的动态。未补偿的旋转（nu）和表面旋转的存在强烈影响反铁磁纳米粒子的磁响应。在这种情况下，表面各向异性的强度决定了矫顽场的温度依赖性的行为。在Ferrimagnetic纳米颗粒中，磁化和矫顽力取决于表面的细节。
展开▼
