The anomalous temperature dependence of the paramagnetic response of Fe-rich fcc Fe-Ni

Author： Acet M. Wassermann E. F. Andersen K. Murani A. Schärpff O.

E-ISSN： 1286-4854|40|1|93-98

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.40, Iss.1, 2010-03, pp. : 93-98

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Abstract

Temperature dependent paramagnetic neutron scattering experiments onfcc ${\rm Fe}_{100-x}{\rm Ni}_x$ anti-Invar alloys ($0\le x\le 30$at%) show strong magnetic scattering in the foreward direction attemperatures as high as 1100 K, indicating ferromagnetic correlationsalthough, no long-range ferromagnetic ordering occurs in the fcc stateof the alloys with $x\le 25$ at%. The intensity of the magneticscattering in the foreward direction decreases with increasingtemperature for x=20 and 25 at%, it remains nearly constant withtemperature for x=15 at% and shows the unusual behavior ofincreasing with increasing temperature for x=10 at%. Thetemperature dependence of the correlation length also behavessimilarly.