FIELD-INDUCED MAGNETIC-MOMENTS IN AMORPHOUS FE-ZR SPIN-GLASS-LIKE ALLOYS

Rotation of the Fe magnetic moments toward the collinear state in appl ied magnetic fields up to 7 T was studied by Fe-57 Mossbauer spectrosc opy at 4.2 K. The investigated Fe100-xZrx (7 less-than-or-equal-to x l ess-than-or-equal-to 12) amorphous alloys show spin glass, reentrant s pin glass, and ferromagnetic behavior at different concentrations. The collinear state was reached in all the alloys below 7 T. Large high f ield susceptibilities corresponding to more than 0.1mu(B) increase of the average Fe magnetic moments were deduced from the hyperfine fields . The results are in good agreement with bulk magnetic measurements an d cannot be explained by antiferromagnetically aligned Fe moments.