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# Karapetrova Evguenia <jenia@anl.gov>
# requesting 6 days, at minimum=5 days
# beamline 33BM, Study of the examine the strain state of Fe3O4 thin films deposited on BaTiO3 substrates
# instrument 33BM-C fourc
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# top:/home/www/beamtime-requests/req01170.txt
# UNICAT Member Beam Time Request  #1170
# created Mon Aug 27 15:21:10 CDT 2007
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apsrun:
	2007-03

beamline:
	33BM

collaboration:
	Yes

collaborator_Jenia:
	ON

contact:
	jenia@anl.gov

days:
	6

description:
	Magnetoelectric effects are those that result from interactions between ferroelectric and magnetic properties of materials. Magnetoelectric materials have been proposed for use in a wide variety of applications, including the creation of devices for optical polarization, phase, and amplitude modulation, data storage, optical diodes, sensors, and actuators [1,2]. One approach to the creation of a magnetoelectric material is to make composites of ferroelectric and ferromagnetic materials. Large magnetoelectric interactions have been observed in ordered composites between CoFe2O4 and BaTiO3 [3]. These effects were attributed to a coupling between piezoelectricity and magnetostriction mediated by the strain between the two materials induced by epitaxy. In a layered structure of CoFe2O4 and BaTiO3 such effects were not observed [3]. The lack of a strong magnetoelectric interaction in this system was attributed to clamping by the substrate, which prevented the formation of a strain in the CoFe2O4 and BaTiO3 layers. It is possible to eliminate this problem by depositing ferromagnetic layers directly onto a ferroelectric substrate. In this case the entire substrate will induce a strain in the ferromagnetic material. We propose to examine the strain state of Fe3O4 thin films deposited on both BaTiO3 substrates and BaTiO3 thin films deposited on Nb:SrTiO3 substrates in the presence of electric fields applied in situ by using x-ray specular reflectivity and diffuse scattering. This will allow us to examine the effects of substrate clamping on these systems and to determine how strongly the strain state to the Fe3O4 layer is affected by that of the BaTiO3 layer. The observed changes in the strain state of the ferromagnetic layer can then be compared with changes observed in the magnetic properties in the presence of applied magnetic fields.

equipment_required:
	displex

experiment:
	Study of the examine the strain state of Fe3O4 thin films deposited on BaTiO3 substrates

foreign_nationals:
	

hazards:
	

instrument:
	33BM-C fourc

instrument_other:
	

minimumdays:
	5

name:
	Karapetrova Evguenia

nonmembers:
	George Sterbinsky, Philip Ryan, David Keavney

submit:
	Submit

unacceptable_dates:
	11/03/07

z34ID_details:
	


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