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The layer-by-layer stoichiometry of La0.7Sr0.3MnO3/SrTiO3 thin films and interfaces

Song, F.; Monsen, A. F.; Li, Z. S.; Wells, Justin LU and Wahlstrom, E. (2013) In Surface and Interface Analysis 45(7). p.1144-1147
Abstract
By using a combination of synchrotron photoemission and a finite element model, the layer-by-layer stoichiometry of pulsed laser deposited La0.7Sr0.3MnO3 (LSMO) thin films is extracted. For 3- and 5-unit-cell films, the LSMO stoichiometry at the LSMO/SrTiO3 interface has been studied, and it is found that the Sr surface segregation is reversed at the lower interface such that it becomes La rich and Sr depleted. Mn is depleted throughout the entire layer, consistent with reports of a magnetically dead' layer and the formation of a Ruddlesden-Popper phase. The depth-averaged Mn concentration is less than 50% of the expected value, suggesting that interface mixing or segregation into the bulk is important, whereas the depth-averaged La and Sr... (More)
By using a combination of synchrotron photoemission and a finite element model, the layer-by-layer stoichiometry of pulsed laser deposited La0.7Sr0.3MnO3 (LSMO) thin films is extracted. For 3- and 5-unit-cell films, the LSMO stoichiometry at the LSMO/SrTiO3 interface has been studied, and it is found that the Sr surface segregation is reversed at the lower interface such that it becomes La rich and Sr depleted. Mn is depleted throughout the entire layer, consistent with reports of a magnetically dead' layer and the formation of a Ruddlesden-Popper phase. The depth-averaged Mn concentration is less than 50% of the expected value, suggesting that interface mixing or segregation into the bulk is important, whereas the depth-averaged La and Sr concentrations are close to the expected values. Copyright (c) 2013 John Wiley & Sons, Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
XPS, synchrotron photoemission, maximum entropy, finite element, LSMO
in
Surface and Interface Analysis
volume
45
issue
7
pages
1144 - 1147
publisher
Wiley-Blackwell
external identifiers
  • wos:000320332300011
  • scopus:84879095382
ISSN
0142-2421
DOI
10.1002/sia.5240
language
English
LU publication?
yes
id
3e469ce6-2719-4435-b817-c7ac5d276213 (old id 3987339)
date added to LUP
2013-09-11 15:53:55
date last changed
2019-06-04 02:04:20
@article{3e469ce6-2719-4435-b817-c7ac5d276213,
  abstract     = {By using a combination of synchrotron photoemission and a finite element model, the layer-by-layer stoichiometry of pulsed laser deposited La0.7Sr0.3MnO3 (LSMO) thin films is extracted. For 3- and 5-unit-cell films, the LSMO stoichiometry at the LSMO/SrTiO3 interface has been studied, and it is found that the Sr surface segregation is reversed at the lower interface such that it becomes La rich and Sr depleted. Mn is depleted throughout the entire layer, consistent with reports of a magnetically dead' layer and the formation of a Ruddlesden-Popper phase. The depth-averaged Mn concentration is less than 50% of the expected value, suggesting that interface mixing or segregation into the bulk is important, whereas the depth-averaged La and Sr concentrations are close to the expected values. Copyright (c) 2013 John Wiley & Sons, Ltd.},
  author       = {Song, F. and Monsen, A. F. and Li, Z. S. and Wells, Justin and Wahlstrom, E.},
  issn         = {0142-2421},
  keyword      = {XPS,synchrotron photoemission,maximum entropy,finite element,LSMO},
  language     = {eng},
  number       = {7},
  pages        = {1144--1147},
  publisher    = {Wiley-Blackwell},
  series       = {Surface and Interface Analysis},
  title        = {The layer-by-layer stoichiometry of La0.7Sr0.3MnO3/SrTiO3 thin films and interfaces},
  url          = {http://dx.doi.org/10.1002/sia.5240},
  volume       = {45},
  year         = {2013},
}