A Review of Physics of High-Performance Magnets

Abstract

High-performance magnets are essential components in modern technologies ranging from electric vehicles and renewable energy systems to data storage, medical imaging, and aerospace applications. Their exceptional magnetic properties arise from complex physical phenomena involving electronic structure, spin interactions, crystal anisotropy, and microstructural control. This review presents a comprehensive examination of the physics underlying high-performance magnetic materials, including permanent magnets, soft magnetic materials, and emerging nanostructured magnets. Fundamental concepts such as exchange interactions, magnetocrystalline anisotropy, domain theory, coercivity mechanisms, and temperature dependence are discussed in detail. A systematic literature review of 25 scholarly sources is provided, followed by a comparative table and detailed analysis of different magnet classes. The discussion highlights current challenges, material limitations, and sustainability concerns, while the conclusion outlines future directions driven by physics-based design and advanced modeling approaches.