Issue
J. Phys. Colloques
Volume 50, Number C8, Novembre 1989
36th International Field Emission Symposium
Page(s) C8-337 - C8-342
DOI https://doi.org/10.1051/jphyscol:1989857
36th International Field Emission Symposium

J. Phys. Colloques 50 (1989) C8-337-C8-342

DOI: 10.1051/jphyscol:1989857

FIM-ATOM PROBE INVESTIGATION OF MELT-SPUN PERMANENT MAGNETS BASED ON NdFeB

A. HÜTTEN et P. HAASEN

Institut für Metallphysik der Universität Göttingen and Sonderforschungsbereich 126, D-3400 Göttingen, F.R.G.


Abstract
The microstructure of Nd15Fe77B8 in the optimum magnetic state is compared to that of overquenched and heat treated specimens using Field Ion Microscopy (FIM) and Atom Probe (AP) techniques. Apart from the hard magnetic Nd2Fe14B - (Φ) - and the nonmagnetic Nd1.1Fe4B4 - (η) - a metastable Nd7Fe3 - phase controls the magnetic properties of melt-spun NdFeB - ribbons. Furthermore the influence of a partial Fe substitution by Co on the microstructure was investigated and is presented in this report.