Abstract
The presence of spin-fluctuations deep within the ordered state of ferromagnetic alloy has long been suspected but seldom directly observed. Inhomogeneities of one type or another have been cited as important in stabilizing behaviour—either longitudinal spin-fluctuations associated with the -state (local environment) model or transverse magnetisation arising from non-collinear spin structures. In this study we employ small-angle neutron scattering with neutron polarization analysis to distinguish between the two possibilities. Surprisingly we in fact find evidence of dominant but uncorrelated longitudinal spin-fluctuations coexisting with transverse magnetisation which exists in short-range clusters of size ~. This finding supports recent first principles calculations of in which both longitudinal spin-fluctuations and magnetic short-range order are identified as important ingredients in reproducing the equilibrium lattice.
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