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*Physica B: Condensed Matter*
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doi:10.1016/0921-4526(95)00951-5
<http://dx.doi.org/10.1016/0921-4526(95)00951-5>    
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    Neutron diffraction and reflectivity studies of the Cr Néel
    transition in Fe/Cr (0 0 1) superlattices

* *

*Eric E. Fullerton^a <#orfa>^, ^* <#cor*>, S. Adenwalla^a <#orfa>, G. P.
Felcher^a <#orfa>, K. T. Riggs^a <#orfa>, C. H. Sowers^a <#orfa>, S. D.
Bader^a <#orfa> and J. L. Robertson^b <#orfb> *

^a Materials Science Division, Argonne National Laboratory Argonne, IL
60439 USA
^b Solid State Division, Oak Ridge National Laboratory Oak Ridge, TN USA

Available online 12 February 1999.


    Abstract

The effects on the interlayer coupling of the Cr Néel transition is
studied in Fe/Cr(0 0 1) superlattices. The Néel transition is suppressed
for Cr layer thickness < 42 å. For > 42 å of Cr, the Néel temperature
/T/_N initially increases rapidly and then asymptotically approaches its
bulk value with a three-dimensional transition-temperature shift
exponent value of = 1.4 ± 0.3. Neutron diffraction confirms both the Cr
antiferromagnetic order and the existence of the incommensurate,
transverse spin density wave whose nesting wave vector is the same as
that of bulk Cr. The ordering of the Cr dramatically alters the coupling
of the Fe layers. The biquadratic Fe interlayer coupling observed for
/T/ >/T/_N vanishes below /T/_N as confirmed by polarized neutron
reflectivity. The behavior can be understood in terms of finite-size and
spin frustration effects at rough Fe-Cr interfaces.


^* <#bcor*>Corresponding author.


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