Invar behavior of fcc <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Fe</mi></mrow><mrow><mn>1</mn><mi mathvariant="normal">−</mi><mi mathvariant="italic">x</mi></mrow></msub></mrow></math></span><span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Ni</mi></mrow><mrow><mi mathvariant="italic">x</mi></mrow></msub></mrow></math></span> thin films

G. Dumpich; J. Kästner; U. Kirschbaum; H. Mühlbauer; J. Liang; Th. Lübeck; E. F. Wassermann

doi:10.1103/PhysRevB.46.9258

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Invar behavior of fcc ${Fe}_{1 - x}$ ${Ni}_{x}$ thin films

G. Dumpich, J. Kästner, U. Kirschbaum, H. Mühlbauer, J. Liang, Th. Lübeck, and E. F. Wassermann

Phys. Rev. B 46, 9258(R) – Published 1 October 1992

Abstract

From measurements of the thermal expansion and magnetization on uhv evaporated fcc Fe-Ni alloy films we show that the deviation of the average magnetic moment from the Slater-Pauling curve, observed in Fe-Ni bulk alloys around ${Fe}_{65}$ ${Ni}_{35}$ , is not a necessary condition for the occurrence of the Invar effect. The results also address the long-debated issue of why in bulk Invar alloys the spin-wave stiffness is high when determined by inelastic neutron scattering, but low when a Bloch law is fitted to the low-temperature magnetization dependence.

Received 19 March 1992

DOI:https://doi.org/10.1103/PhysRevB.46.9258

Authors & Affiliations

G. Dumpich, J. Kästner, U. Kirschbaum, H. Mühlbauer, J. Liang, Th. Lübeck, and E. F. Wassermann

Tieftemperaturphysik, Universität Duisburg, Lotharplatz 1, 4100 Duisburg 1, Germany

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Vol. 46, Iss. 14 — 1 October 1992

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