Bd. Shanina et al., EXCHANGE INTERACTION BETWEEN ELECTRON SUBSYSTEMS IN IRON-BASED FCC ALLOYS DOPED BY NITROGEN OR CARBON, Physica status solidi. a, Applied research, 149(2), 1995, pp. 711-722
The effect of nitrogen and carbon on the electronic and magnetic prope
rties of the iron-base Fe56Cr18Ni16Mn10 3d-alloy with f.c.c. lattice (
austenite) is studied by means of the magnetic resonance. It is shown
that the electron state density on the Fermi surface in the nitrogen a
ustenite is one order of magnitude higher than that in the carbon one.
Based on measurements of the temperature dependence of the g-factor t
he existence of superparamagnetic clusters is stated, the latter being
obviously clusters of substitutional solutes. Signs and values of the
exchange interaction between conduction electrons and other magnetic
subsystems are obtained from the analysis of the temperature dependenc
e of the paramagnetic susceptibilities. The exchange interaction betwe
en conduction electrons and isolated localised spins has antiferromagn
etic character, while conduction electron-cluster interaction is ferro
magnetic. The size of the clusters is markedly higher in the carbon au
stenite. This difference in structural homogeneity can be used for an
explanation of the higher thermodynamic stability of the nitrogen aust
enite as compared to the carbon one.