#
# arev:/usr/local/unicat/unireq/beamreq/req00005.txt
# UNICAT Member Beam Time Request  #5

# created Thu Dec 11 14:06:04 CST 1997
#

days:
	4

description:
	The giant magnetoresistance effect is now finding application in magnetic 
	recording.  However, questions remain about the nature of the anti-
	ferromagnetic coupling via non-magnetic layers that is the basis of the
	effect.  We have grown superlattices of Co/Ir which exhibit very strong
	antiferromagnetic exchange coupling.  We will examine the magnetic
	structure using neutron scattering in January, and should be ready in Februare to
	search for spin polarization in the Ir by means of exchange resonant
	scattering at the Ir L-edges.  We expect magnetic peaks to appear in
	$%5Csigma-%5Cpi$ geometry at positions in between the superlattice charge
	peaks.  The scattering will be weak, requiring undulator intensity.  It
	will be necessary to defocus the beam, as previous attempts at this 
	experiment resulted in destruction of the sample due to the energy 
	absorbed by the superlattice at the L-edge.  Based on previous XRES 
	measurements, we expect to be able to detect an induced, coherent moment
	 %3E0.1 Bohr magnetons.  We have our own polarimeter, which mounts on the
	2-theta arm of the Huber.  This is a room temperature experiment.

equipment+required:
	Huber

experiment:
	Induced magnetic polarization in Co/Ir superlattices

name:
	Myron B. Salamon

new+request:
	on

nonmembers:
	E. Kita and H. Yanigihara, University of Tsukuba

station:
	33ID-D

unacceptable+dates:
	Before Feb 1.



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