How Does Size Affect Magnetic Hysteresis in Nanomaterials?
The size of nanoparticles plays a critical role in their magnetic properties. In general, as the size of a magnetic nanoparticle decreases, the surface-to-volume ratio increases, which can significantly alter its magnetic behavior. For instance, superparamagnetism emerges in nanoparticles smaller than a critical size, where thermal fluctuations can randomly flip the direction of magnetization, effectively eliminating hysteresis at room temperature.
