Title :
TEM-study of the precipitation of iron in Nd-Fe-B sintered magnets
Author :
Fidler, Josef ; Tawara, Yoshio
Author_Institution :
Inst. of Appl. Phys., Tech. Univ. of Vienna, Austria
fDate :
3/1/1988 12:00:00 AM
Abstract :
The microstructure of sintered Nd-Fe-B magnets is studied by analytical electron microscopy. The presence of Fe-rich precipitates was first found in magnets showing a small kink in the demagnetization curve, which is an evidence for soft magnetic nucleation centers for reversed magnetic domains within the magnet. alpha -iron precipitates occurred outside as well as within the hard magnetic 2:14:1 grains and were also found in other commercial-grade magnets with a nominal composition close to Nd15-Fe77-B8.
Keywords :
boron alloys; demagnetisation; ferromagnetic properties of substances; iron alloys; magnetic domains; neodymium alloys; permanent magnets; precipitation; transmission electron microscope examination of materials; Fe-rich precipitates; Nd-Fe-B; Nd-Fe-B sintered magnets; TEM-study; alpha Fe; analytical electron microscopy; demagnetization curve; hard magnetic 2:14:1 grains; kink; microstructure; precipitation; reversed magnetic domains; soft magnetic nucleation centers; Iron; Magnetic analysis; Magnetic anisotropy; Magnetic domains; Magnetic force microscopy; Magnets; Microstructure; Perpendicular magnetic anisotropy; Soft magnetic materials; Transmission electron microscopy;
Journal_Title :
Magnetics, IEEE Transactions on
