National School on Neutron and XRay Scattering

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National School on Neutron and X-Ray
Scattering Oak Ridge and Argonne
National Laboratories September
24 through October 11, 2008
Magnetic Scattering Applications
C.F.Majkrzak, NIST Center for Neutron
Research,
Gaithersburg, MD
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As recounted in the Scientific
Background material referred to on the left
side of the page, prior to the discovery of the
GMR effect by Gruenberg, polarized neutron
diffraction studies of magnetic superlattices
revealed an unambiguous coupling between
magnetic layers across intervening
nonmagnetic spacers. The interlayer coupling
(IEC) observed in this neutron diffraction work
was explained in terms of long-range exchange
interactions, for example, the RKKY (Ruderman
Kittel Kasuya Yosida) interaction.
Interestingly, the underlying mechanism
responsible for GMR was thus known about before
the effect itself was discovered! Much of the
original neutron diffraction work was performed
at the NIST (then NBS) neutron scattering
facility by scientists including James Rhyne,
Ross Erwin, and Julie Borchers, some of whom
continue related forefront research today at the
NCNR. This is an example of the continuing
importance of neutron scatttering as a
fundamental probe of condensed matter.
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(A.Schreyer et al.)?
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