Fumihiko Hirata

Title: Fumihiko Hirata: Innovator in Magnetic Materials

Introduction

Fumihiko Hirata is a prominent inventor based in Chiba, Japan. He has made significant contributions to the field of magnetic materials, holding a total of 7 patents. His work focuses on the development of advanced magnetic powders and sintered magnets, which have applications in various technologies.

Latest Patents

Hirata's latest patents include innovations in magnet powder, sintered magnets, and processes for their production. One of his notable inventions involves a magnetic powder and sintered magnet that contain a primary phase of hexagonal ferrite. This ferrite includes elements such as A, Co, or R, where A represents Sr, Ba, or Ca, and R includes rare earth elements like Y and Bi. These materials exhibit at least two different Curie temperatures, ranging from 400 to 480°C, with a minimum difference of 5°C. The resulting magnetic powder and sintered magnet demonstrate enhanced saturation magnetization and magnetic anisotropy, leading to high residual magnetic flux density and coercive force, surpassing the capabilities of conventional M-type ferrite magnets.

Additionally, Hirata has developed a process for producing anisotropic ferrite magnets. This process involves compacting ferrite magnet raw material particles in a non-aqueous solvent within a magnetic field. The compact is then sintered to achieve the desired anisotropic properties. The inclusion of a surface-active agent during the wet compaction process significantly improves the orientation of the compact, resulting in superior magnet properties.

Career Highlights

Hirata's career is marked by his dedication to advancing magnetic technology. His work at TDK Corporation has positioned him as a leader in the field of magnetic materials. His innovative approaches have led to breakthroughs that enhance the performance of magnets used in various applications.

Collaborations

Hirata has collaborated with notable colleagues, including Hitoshi Taguchi and Taku Takeishi. These partnerships have contributed to the successful development of his patented technologies.

Conclusion

Fumihiko Hirata's contributions to the field of magnetic materials through his patents and innovative processes have established him as a key figure in the industry. His work continues to influence advancements in technology and materials science.