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Magnetic Compton Scattering Studies of the Invar Effect in Fe3Pt

Published online by Cambridge University Press:  15 February 2011

C. J. Yahnke ,
G. Srajer ,
D. R. Haeffner ,
D. M. Mills  and
L. Assoufid
C. J. Yahnke
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439
G. Srajer
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439
D. R. Haeffner
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439
D. M. Mills
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439
L. Assoufid
Affiliation:
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439
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Abstract

We have measured the magnetic Compton profile (MCP) of ordered and disordered Fe 3Pt samples both above and below their Curie temperature. From these measurements, we have determined the average moment per atom at room temperature to be 2.81μB ± 0.04μB for disordered Fe3Pt and 1.78μB ± 0.05μB for ordered Fe3Pt. At temperatures above Tc, we measured a substantial reduction in the moment (0.6μB ± 0.10μB for disordered Fe3Pt and 0.64μB ± 0.13μB ± for ordered Fe3Pt) and a change in the shape of the MCP. This suggests that the mechanism behind the Invar effect in Fe3Pt can be described by a high-spin to low-spin magnetic phase transition. The experimental MCPs for both ordered and disordered Fe3 Pt are analyzed within the framework of the Weiss 2γ model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 375: Symposia AA – Applications of Synchrotron Radiation Techniques to Materials Science , 1994 , 221
Copyright
Copyright © Materials Research Society 1995

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