Orientation and thickness dependence of magnetization at the interfacesof highly spin-polarized manganite thin films [electronic resource].

Published:: Berkeley, Calif. : Lawrence Berkeley National Laboratory. Advanced Light Source, 2008.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory. Advanced Light Source, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We have probed the nature of magnetism at the surface of (001), (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO₃ thin films. The spin polarization of La{sub 0.7}Sr{sub 0.3}MnO₃ thin films is not intrinsically suppressed at all surfaces and interfaces but is highly sensitive to both the epitaxial strain state as well as the substrate orientation. Through the use of soft x-ray spectroscopy, the magnetic properties of (001), (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO₃/SrTiO₃ interfaces have been investigated and compared to bulk magnetometry and resistivity measurements. The magnetization of (110) and (111)-oriented La{sub 0.7}Sr{sub 0.3}MnO₃/SrTiO₃ interfaces are more bulk-like as a function of thickness whereas the magnetization at the (001)-oriented La{sub 0.7}Sr{sub 0.3}MnO₃/SrTiO₃ interface is suppressed significantly below a layer thickness of 20 nm. Such findings are correlated with the biaxial strain state of the La{sub 0.7}Sr{sub 0.3}MnO₃ films; for a given film thickness it is the tetragonal distortion of (001) La{sub 0.7}Sr{sub 0.3}MnO₃ that severely impacts the magnetization, whereas the trigonal distortion for (111)-oriented films and monoclinic distortion for (110)-oriented films have less of an impact. These observations provide evidence that surface magnetization and thus spin polarization depends strongly on the crystal surface orientation as well as epitaxial strain.

Report Numbers:

E 1.99:lbnl-1698e
lbnl-1698e

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Published through SciTech Connect.
08/18/2008.
"lbnl-1698e"
Physical Review B 79 ISSN 1098-0121 FT
Suzuki, Y.; Arenholz, Elke; Chopdekar, Rajesh V.
Materials Sciences Division

Funding Information:

DE-AC02-05CH11231

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