Nanoscale anisotropic Nd-Fe-B particles with high coercivity prepared by attrition milling

Wehrenberg, C.; Daniil, M.; Willard, M.; Zande, B.; Sankar, S.; Thadhani, N.
June 2013
Applied Physics Letters;6/3/2013, Vol. 102 Issue 22, p223111
Academic Journal
Nanoscale Nd-Fe-B particles were fabricated with room temperature coercivity of 4.9 kOe by attrition (stirred media) milling. For longer milling times, more than 80% of the particles were less than 500 nm diameter, and 50-200 nm particles can be selected by a decanting process. Anisotropy was demonstrated by field alignment, as shown by creation of strong texture in x-ray diffraction (XRD) patterns. Limited peak broadening in XRD patterns indicates that attrition milling produces less deformation and amorphous material than high-energy milling. Compared to other magnetic nanoparticles, the higher coercivity is attributed to limited plastic deformation and larger sized particles.


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