Abstract
We have carried out precise measurements of the magnetization on an amorphous metallic ferromagnet Fe 83 B 17 from 4.2 K to 340 K in a high field of 5.03 T. Detailed analysis of the observed data shows that the magnetization does not obey a simple spin wave T 3/2 law but follows a sum of the renormalized spin wave term and the Stoner-type contribution varying as T 2 rather than e - Δ / k B T . The spin wave stiffness constant is expressed as D = D 0 (1- D 2 T 5/2 ) with D 0 =120±5 meVA 2 and D 2 =(2.0±0.5)×10 -8 K -5/2 , which is roughly consistent with that determined directly from neutron scattering. This suggests no existence of the well-known anomaly of the spin wave stiffness constant reported in earlier measurements. We discuss behavior of the magnetization at finite temperatures in terms of the local magnetic moment.
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