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Magnetic Percolation in New Crystalline FCC Fe-Cu Alloys

Published online by Cambridge University Press:  26 February 2011

C. L. Chien ,
S. H. Liou ,
Gang Xiao  and
M. A. Gatzke
C. L. Chien
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
S. H. Liou
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
Gang Xiao
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
M. A. Gatzke
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218
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Abstract

Magnetic percolation has rarely been realized in Fe-based binary alloys either because Fe does not retain its moment in the dilute limit or because the solubility is too low. By using a vapor quenching method, which in our case is highrate sputtering, we have succeeded in making new metastable crystalline alloys of fcc FexCu1−x which do not appear in the equilibrium phase diagram. These alloys spanning the percolation threshold allow magnetic percolation phenomena on an fcc lattice to be observed by SQUID magnetometry and Mössbauer spectroscopy. Above xc, the magnetic ordering temperature varies as (x−xc)γ with xc = 0.185 and γ = 0.63. Below xc, spin glass ordering has been observed.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 395
Copyright
Copyright © Materials Research Society 1987

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