Yoshishige Koma

Title: Yoshishige Koma: Innovator in Ferromagnetic Powders

Introduction

Yoshishige Koma is a notable inventor based in Gunma, Japan. He has made significant contributions to the field of magnetic materials, particularly through his innovative work on ferromagnetic metallic powders.

Latest Patents

Koma holds a patent for ferromagnetic metallic powders that are useful for magnetic recording. His invention involves ferromagnetic Fe-Ni alloy powders that possess a coercive force of 550-900 Oe (oersted) and a saturation flux density of 90-170 emu/g. The process includes applying a nickel compound in a liquid to a particulate, oxygen-containing iron compound with specific particle dimensions, followed by drying and reducing the treated material to produce a metallic powder. These ferromagnetic powders are particularly suitable for the production of magnetic recording media due to their balanced magnetic properties.

Career Highlights

Koma is associated with Kanto Denka Kogyo Co., Ltd., where he has been able to apply his expertise in materials science. His work has contributed to advancements in magnetic recording technologies, enhancing the performance and efficiency of various applications.

Collaborations

Koma has collaborated with notable colleagues such as Masaru Hagiwara and Shintaro Suzuki. Their combined efforts have furthered research and development in the field of ferromagnetic materials.

Conclusion

Yoshishige Koma's innovative work in ferromagnetic powders has made a significant impact on magnetic recording technologies. His contributions continue to influence advancements in this critical area of materials science.