Title :
Crystallization and magnetic properties of Fe84B9 Nb7 amorphous ribbons
Author :
Chul Sung Kim ; Sung Baek Kim ; Kim, Chul Sung ; Lee, J.S. ; Noh, T.H.
Author_Institution :
Dept. of Phys., Kookmin Univ., Seoul, South Korea
fDate :
9/1/1996 12:00:00 AM
Abstract :
The amorphous Fe84B9Nb7 and its nanocrystallization have been studied by X-ray, Mossbauer spectroscopy and magnetic moment measurements. The average hyperfine field Hhf (T) of the amorphous state shows a temperature dependence of [H hf(T)-Hhf(0)]/Hhf(0)=-0.52 (T/TC )3/2-0.34 (T/TC)5/2 for T/TC <0.7 indicative of spin-wave excitation. The quadrupole splitting just above the Curie temperature TC is 0.41 mm/s, whereas the average quadrupole shift below TC is zero. The Curie and crystallization temperatures are determined to be TC=330 K and Tx=750 K respectively, for a heating rate of 5 K/min. The occupied area of the nanocrystalline phase at the optimum annealing temperature is about 73%
Keywords :
Curie temperature; Mossbauer effect; X-ray diffraction; amorphous magnetic materials; annealing; boron alloys; crystallisation; ferromagnetic materials; hyperfine interactions; iron alloys; magnetic moments; metallic glasses; nanostructured materials; niobium alloys; quadrupole interactions; spin waves; 330 K; 750 K; Curie temperature; Fe84B9Nb7; Mossbauer spectroscopy; X-ray diffraction; amorphous ribbons; annealing temperature; crystallization temperature; hyperfine field; magnetic moment; nanocrystallization; quadrupole splitting; spin-wave excitation; Amorphous materials; Crystallization; Hafnium; Iron; Magnetic field measurement; Magnetic moments; Magnetic properties; Niobium; Spectroscopy; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
