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Jožef Stefan
Postgraduate School

Jamova 39
SI-1000 Ljubljana

Phone: +386 1 477 31 00
Fax: +386 1 477 31 10


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You are invited to the 18th Institute colloquium in the academic year 2015/16. The colloquium will be held on Monday May 9th, 2016 at 1 PM in the main Institute lecture hall, Jamova 39, Ljubljana. 

Prof. Dr. Kazuhiro Hono

Magnetic Materials Unit, National Institute for Materials Science, Tsukuba, Japan

Dy-free high coercivity Nd-Fe-B permanent magnets

Due to the recent concern about the stable supply of heavy rare earth elements, attaining high coercivity in Nd-Fe-B magnets without Dy has received intense research interest. In this talk, we will update our recent progresses toward the development of high coercivity Nd-Fe-B permanent magnets. To obtain complete understanding of the microstructure-coercivity relationships, we revisited the microstructures of Nd-Fe-B sintered and hot-deformed magnets using aberration-corrected STEM complemented by atom probe tomography. We found that the structure and chemical composition of the grain boundary phase varies depending on the orientation of grain boundaries, i.e., the grain boundary phase parallel to the c-planes are mostly crystalline with a higher Nd concentration in contrast to that lying parallel to the c-axis that contains higher Fe content with an amorphous structure. Based on these new findings, we developed a method to increase the coercivity of the anisotropic Nd-Fe-B magnets substantially without relying on Dy.    

To read the abstract click Past colloquia are posted on

Cordially invited!