Title :
Transmission electron microscope studies of Pr-Fe-B alloy prepared by melt spinning
Author :
Meekison, C.D. ; Jakubovics, J.P. ; Kostikas, A. ; Niarchos, D. ; Papaefthymiou, V.
Author_Institution :
Dept. of Mater., Oxford Univ., UK
fDate :
9/1/1990 12:00:00 AM
Abstract :
The microstructures and domain configurations of a Pr2Fe7B3 alloy prepared in amorphous form by melt spinning and subsequently crystallized by annealing at temperatures from 606°C to 660°C were studied by transmission electron microscopy (TEM). The grain size was about 100 mm. The specimens appear to consist of Pr2Fe14B grains separated by nonmagnetic phases. The nonmagnetic phases occur in both Pr 1+eFe4B4 grains and (probably) a Pr-rich solidified eutectic, which gives a mottled contrast in TEM. Lorentz microscopy of thermally demagnetized specimens shows that the magnetic grains (at least the great majority of them) are single-domain. Small changes are seen in the magnetization configuration after applying and then removing a field of approximately 1 T, indicating magnetization reversal in some grains
Keywords :
boron alloys; ferromagnetic properties of substances; grain size; iron alloys; magnetic domains; magnetic properties of fine particles; magnetisation reversal; melt spinning; praseodymium alloys; transmission electron microscope examination of materials; 606 to 660 degC; Lorentz microscopy; Pr-rich solidified eutectic; Pr2Fe14B; Pr2Fe7B3; TEM; amorphous form; annealing; domain configurations; grain size; magnetic grains; magnetization configuration; magnetization reversal; melt spinning; microstructures; mottled contrast; nonmagnetic phases; single-domain; thermally demagnetized specimens; transmission electron microscopy; Amorphous materials; Annealing; Crystal microstructure; Crystallization; Grain size; Iron alloys; Magnetic force microscopy; Spinning; Temperature; Transmission electron microscopy;
Journal_Title :
Magnetics, IEEE Transactions on
