Abstract
Magnetism in amorphous alloys of RuxFe80−xB20, 0⩽ × ⩽ 22 has been investigated using high field magnetization and Mossbauer spectroscopy. The average Fe hyperfine field in Ru18Fe62B20 shows an anomalous rise at low temperatures. In Ru rich alloys a low field component appears in the hyperfine field distribution and the alloys do not saturate magnetically in 80 kG fields. It is inferred that their magnetic structure is non collinear and that antiferromagnetic exchange in the system increases with Ru concentration.
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