Distribution of Hyperfine Fields in Magnetically Anisotropic Amorphous Fe_<100-x>B_x Alloys

概要

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The temperature dependence of the Mossbauer spectra of the amorphous Fe_<100-x>B_x (x=14~21) alloys has been measured. The two distributions of intensity, I_<1, 3> (H) and I_2(H), which are associated with (±3/2-±1/2) and (±1/2-^-_+1/2), and with (±1/2-±1/2) transitions, respectively, are calculated from the spectra separately. The fact that the shapes of I_2(H) are different from those of I_<1, 3> (H) at 20K gives evidence that the magnitude and direction of hyperfine fields are not independent of each other, but are correlated. The ratio of the average fields H_2, derived from I_2(H), to H, derived from the hyperfine field distribution P(H), at 20K is dependent on the boron concentration. It is considered that there exists a spatial fluctuation of composition in the samples, and that in the regions where x=17 the magnetization changes its direction easily from parallel to perpendicular to the sample plane, under the stresses caused by decreasing temperature.
東北大学の論文
1985-03-26