#
# arev:/usr/local/unicat/unireq/beamreq/req00061.txt
# UNICAT Member Beam Time Request  #61

# created Mon May 10 17:06:57 CDT 1999
#

days:
	5

description:
	Preliminary measurements of Co/Ir superlattices grown on SrTiO_3 
	have revealed the long-sought evidence for a magnetic signal at half-
	order superlattice positions.  The signal is resonant at the Ir L_III
	edge and somewhat broader than the superlattice charge peaks.  Beam
	time is requested to characterize this peak, which is located near
	the peak in the Ir stucture factor, by studying the resonant properties
	in greater detail, determining its rocking width, and seeking a peak
	at other candidate positions.  Other samples grown on STO will be 
	available.  Evidently, growth on STO solves previous problems encountered
	with degradation of samples grown on MgO on exposure to the x-ray beam.

equipment+required:
	UIUC Polarimeter

experiment:
	Spacer-layer magnetization in exchange coupled superlattices

hazards:
	None known

name:
	M. B. Salamon

nonmembers:
	H. Yanagihara will join the Salamon group as a postdoc before the
	start of this experiment.

station:
	33ID-D

unacceptable+dates:
	Prefer to avoid July 8-9.  Participant from Japan does not arrive in
	the US (for postdoc position) until June 23.



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