High-coercivity ultralight transparent magnets

Coercivity of titanium-substituted high-temperature permanent magnets

The temperature dependence of the coercivity of Sm–Co based magnets is investigated by magnetization measurements and model calculations. The Zr-free titanium-substituted Sm–Co material exhibits a positive temperature coefficient of the coercivity (TCC) above room temperature, a reasonable hysteresis-loop shape, and an appreciable coercivity of 12.3 kOe at 500 C for the nominal composition Sm(C...

CoFe2O4 nanostructures with high coercivity

Coercivity enhancement of Nd-Fe-B sintered magnets by grain boundary modification via reduction-diffusion process

The interface between the Nd2Fe14B particles and the grain boundary surrounding them in Nd-Fe-B sintered magnets was modified by diffusion Dy metal selectively through the grain boundary involving the reduction of Dy2O3 or DyF3 with CaH2 and the coercivity of them was effectively enhanced from 0.98 MA/m to 1.42 MA/m with keeping the high value of remanence. The resultant coercivity was higher t...

Self-pinning: Dominant coercivity mechanism in exchange-coupled permanent/composite magnets

Analysis Technique for Improving Coercivity of Nd-Fe-B Magnets and Development of Dy-free Magnet

Hiroyuki Yamamoto, Dr. Eng. Isao Kitagawa, Dr. Sc. Teruo Kohashi, Dr. Sc. Akira Sugawara, Dr. Eng. Takeshi Nishiuchi, Dr. Eng. OVERVIEW: Hitachi is working to improve the performance of the NdFe-B magnets that help make people’s way of life more energy efficient and reduce the load it places on the environment. To study the factors that govern coercivity, an important parameter of magnet perfor...