Hard Ferrites for Permanent Magnets

Permanent magnets and hard magnetic materials

This review deals with the definition and development of hard magnetic materials with special emphasis on more recent developments in this field. After discussing the fundamental properties of all hard magnetic materials, based on the intrinsic and extrinsic properties, some remarks on the history of hard magnetic materials and permanent magnets are given. The important hard ferrites are only b...

Nanocrystalline hard magnets

in daily-life applications and are key components of numerous electronic, data and medical devices as well as of many applications in the automotive sector. The combination of properties of the R sublattice (4f) and the T sublattice (3d) led to the dramatic improvement in the energy density (BH)max of hard magnetic materials during the last two decades. In the case of nanocrystalline R-T compou...

Prospects for nanoparticle-based permanent magnets

Magnetic nanoparticles smaller than ~15 nm in diameter and with high magnetocrystalline anisotropies K1 ≥ 1 MJ m can be used as building blocks for next-generation permanent magnets. Advances in processing steps are discussed, such as self-assembly, alignment of the easy axes and appropriate nanostructuring that will enable the fabrication of densely packed nanoparticle assemblies with improved...

Method of making permanent magnets

User Manual: Permanent Magnets Electric Motors