Measurements of transverse and longitudinal 'static' spin fluctuations in INVAR
We propose to characterise ferromagnetic clusters in INVAR (Fe65Ni35) using polarised neutrons on D33. This is a continuation proposal - looking to expand on previous neutron polarisation analysis measurements of static spin-fluctuations in INVAR, which disordered ground state may be responsible for the INVRA effect. Comparison of INVAR and non-INVAR FeNi alloys in the previous experiment showed that such static spin fluctuations are absent in non-INVAR stoichiometries at modest saturating fields (around 0.6 T). We now wish to complete this study with a detailed field dependence of the spin-flip and non-spin flip scattering to disentangle the effects of true transverse and longitudinal spin fluctuations on the atomic scale from FM domains. We will need 3 days to complete these measurements.
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STEWART John Ross; GIBLIN Sean; GOODWIN Andrew; HONECKER Dirk and TAYLOR Jonathan. (2016). Measurements of transverse and longitudinal 'static' spin fluctuations in INVAR. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-421
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