Elastic diffuse neutron scattering from weakly ferromagnetic Pt alloys

摘要: Unpolarised neutron diffraction measurements on weakly ferromagnetic PtCo and PtFe alloys give elastic diffuse magnetic cross sections which exhibit marked forward peaks confirming the inhomogeneous distribution of magnetisation in these alloys. The local moments solute atoms are 2.00+or-0.06 mu B 3.16+or-0.04 for Co Fe respectively. These approximately independent composition, but it is not possible to obtain a characteristic polarisation range Pt matrix algorithm indications that this should be nearest-neighbour distance only. much larger than would reasonably expected from bulk values (d sat/dc), where sat saturation magnetisation. It therefore argued Marshall model inapplicable unpolarised data Consequently an alternative has been invoked wherein have interpreted as arising critical scattering neutrons by concentration-driven fluctuations spontaneous occur near percolation concentration onset long-range order.