Publication
Journal of Applied Physics
Paper

Small angle magnetic scattering from amorphous DyCu

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Abstract

The unusual magnetic transition previously reported for the random anisotropy amorphous alloy DyCu was investigated by small-angle neutron scattering methods. The measurements were made on two 150-μm sputtered films at the NBSR SANS spectrometer with incident 6.0-Å wavelength, at temperatures between 5 and 77 K, and for wavevectors 0.016≤q≤0.165 Å-1. The small-angle magnetic intensity at fixed q shows a pronounced break at T≅17 K, corresponding to the weak-field susceptibility cusp as measured on the same sample. The lineshapes at all temperatures were observed to be Lorentzian, with a correlation length slowly increasing as T decreases to a maximum of ∼13 Å at 17 K and remaining constant thereafter. These results are compared with susceptibility and specific heat measurements for insight into the proposed mechanism for the transition.

Date

01 Dec 1984

Publication

Journal of Applied Physics

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