| Abstract Scope |
The properties of magnetic materials vary greatly depending on the nanostructure. The development of permanent magnets, soft magnetic materials, and magnetic recording media is all about controlling the nanostructure so that device properties can be produced from the intrinsic magnetic properties of the ferromagnetic phase. For example, L10-FePt was known as a ferromagnetic phase with high magnetocrystalline anisotropy, but no one thought that FePt could really be applied to magnetic recording media until we realized a FePt-C nanogranular structure in 2008. In this talk, I will review the atom probe study of nanocrystalline soft magnetic material, the development of FePt-C HAMR media born from the study of the coercivity of FePt thin film, and the development of Dy-free Nd-Fe-B high coercivity magnet inspired by the atomic-level grain boundary analysis of Nd-Fe-B magnets. Based on these examples, the importance of nanostructure analysis in the development of magnetic materials is discussed. |