Small angle neutron scattering in NiAl
Journal of Applied Physics, ISSN: 0021-8979, Vol: 53, Issue: 11, Page: 8204-8206
1982
- 26Citations
- 6Captures
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Article Description
The temperature dependence of small angle neutron scattering in weakly ferromagnetic NiAl has been investigated by means of multi-detector small-angle spectrometers at A.E.R.E. Harwell and I.L.L. Grenoble. Measurements are reported in three stoichiometric samples with residual resistivity ratios [RRR=ρ(293 K)/ρ(4.2 K)] of up to 40 and in a Ni rich specimen (Ni Al). The cross sections in stoichiometric specimens exhibit an approximately linear rise with temperature well below the Curie point (T=41±1 K), a peak around T and a fall approximately proportional to (T-T) above T. This behaviour is interpreted in a Ginzburg-Landau model of magnetic fluctuations involving a single adjustable parameter, from which a spin correlation length around T and an effective spin-wave stiffness well below T may be derived. Finally the possible qualitative features of the overall transverse magnetic fluctuation spectrum of NiAl are examined and a simple model is noted which can account for the observed fall in magnetization at low temperatures.
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