HIGH-FIELD MAGNETIC AND MOSSBAUER STUDIES IN AMORPHOUS FE-ER-B-SI ALLOYS

We describe the results of magnetization and Mossbauer studies under high magnetic field on amorphous Fe80-xEr(x)B12Si8 alloys with 0 less-than-or-equal-to x less-than-or-equal-to 15. The Er moment is 8-mu-B at 4.2 K which indicates a conical spin structure with an average cone angle of 54-degrees. The Fe moment decreases only slightly with increasing x. For x = 15, the field dependence of magnetization shows a discontinuity at H = 3 T and it begins to increase remarkably with H. This is attributed, in the light of Mossbauer experiments under fields, to the opening of the canted Fe spin structure. The results are discussed.