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Magnetic Behavior of Ultrathin Films of Pseudomorphic Binary Alloys

Published online by Cambridge University Press:  15 February 2011

S.Z. Wu ,
F.O. Schumann ,
G.J. Mankey  and
R.F. Willis
S.Z. Wu
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA 16802
F.O. Schumann
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA 16802
G.J. Mankey
Affiliation:
Department of Physics, Louisiana State University, Baton Rouge, LA 70803.
R.F. Willis
Affiliation:
Department of Physics, The Pennsylvania State University, University Park, PA 16802
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Abstract

In this work we compare the ferromagnetic behavior of ultrathin FexNi(1-x) and CoxNi(1-x) films grown on Cu(100) epitaxially with varying stoichiometry. The thickness regime chosen was 1 to 5 ML over a wide range of alloy composition. Using a finite-size scaling law we proposed for the Curie temperature vs. film thickness measurements, we extrapolate and plot the bulk fee Curie temperature as a function of composition. The results suggest that the growth of these films is pseudomorphic with the films adapting a fee structure and the Cu lattice constant. Besides, the Invar effect is not observed in these ultrathin films of FexNi(1-x) alloys and the magnetic phase of Fe atoms is the low-spin ferromagnetic phase. The CoxNi(1-x) films show the expected monotonic decrease in Tc with increasing Ni content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 323
Copyright
Copyright © Materials Research Society 1996

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