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doi:10.1016/0304-8853(93)90459-F
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Copyright © 1993 Published by Elsevier Science B.V. All rights reserved.


    Magnetic coupling in Fe/Cr/Fe sandwich structures directly observed
    by polarised neutron reflection

* *

*J. A. C. Bland^a <#aff1>^, ^ <#m4.cor*>, R. D. Bateson^a <#aff1>, N. F.
Johnson^a <#aff1>, S. J. Blundell^a <#aff1>, V. S. Speriosu^b <#aff2>,
S. Metin^b <#aff2>, B. A. Gurney^b <#aff2> and J. Penfold^c <#aff3> *

^a Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK
^b IBM Research Division, Almaden Research Center, 650 Harry Road, San
Jose, CA 95120, USA
^c Rutherford-Appleton Laboratory, Chilton, OX11 0QX, UK

Available online 6 August 2002.


    Abstract

We have used polarised neutron reflection to directly determine the
vector orientation of the individual Fe layer average magnetisations in
an antiferromagnetically coupled 50 ÅFe/15 ÅCr/50 ÅFe sandwich structure
prepared by sputtering. The spin dependent neutron wave in the
multilayer structure is represented by a two component spinor and the
resulting reflected intensity is found to be highly sensitive to
variations in the orientations of the layer-dependent magnetisation
vectors, permitting the preferred orientation of the average
magnetisation in each Fe layer to be studied. The saturated state is
found to correspond to a uniform ferromagnetic alignment of the Fe layer
magnetisations. At low field, we are able to assess the degree to which
the magnetic alignment is fully antiparallel, and conclude that our
results are consistent with the development of a multidomain structure.


^ <#m4.bcor*> /Correspondence to:/ Dr. J.A.C. Bland, Cavendish
Laboratory, Madingley Road, , Cambridge, CB3 0HE, , UK.


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