#
# arev:/usr/local/unicat/unireq/beamreq/req00036.txt
# UNICAT Member Beam Time Request  #36

# created Fri Dec 18 13:27:38 CST 1998
#

days:
	5

description:
	A previous effort to detect the d-electron polarization in Ir spacers 
	in a Co/Ir superlattice gave tantalizing indications of an anti-
	ferromagnetic peak at the Ir L-II edge.  We were unable to get repro-
	ducible results either a) because the superlattice detached from the
	substrate under x-irradiation or b) because of energy drifts in the
	monochrometer.  We will grow new superlattices using a Cr buffer on
	MgO and cool the sample during the measurement, both modifications will
	reduce the decomposition of the hydrolyzed MgO surface.  We will also
	produce new superlattices grown on SrTiO_3, which should be more stable.
	The goal is to detect the actual induced order in Ir that causes strong
	antiferromagnetic coupling of successive Co layers.  Such effects are
	important in GMR-based magnetic recording heads.

equipment+required:
	Displex if MgO substrates are to be used.  

experiment:
	Spacer-layer magnetization in magnetic superlattices.

hazards:
	No known hazards

name:
	Myron B. Salamon

nonmembers:
	H. Yanagihara (University of Tsukuba)
	University of Illinois students: Kevin O'Donovan; Tuson Park

station:
	33ID-D

unacceptable+dates:
	March 3-6
	Later in the cycle is desirable



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