Surface stoichiometry of La0.7Sr0.3MnO3 during in vacuo preparation; A synchrotron photoemission study
(2012) In Surface Science 606(17-18). p.1360-1366- Abstract
- We present a study of the surface stoichiometry and contamination of La0.7Sr0.3MnO3 thin films following exposure to air and subsequent in vacuo preparation. Samples were studied using both soft X-ray synchrotron photoemission (hv = 150 to 350 eV) and traditional Mg-K alpha XPS (hv = 1253.6 eV) whilst annealing incrementally to approximate to 510 degrees C in low pressures of O-2. In all cases, a Mn depleted and Sr rich surface oxide layer is observed, it is of reduced crystalline quality and is charge depleted. This surface layer is weakly affected by subsequent annealing, and is partially reversed by annealing in higher O-2 pressure. Surface carbon contamination is incrementally removed by annealing at increased temperatures, and at 270... (More)
- We present a study of the surface stoichiometry and contamination of La0.7Sr0.3MnO3 thin films following exposure to air and subsequent in vacuo preparation. Samples were studied using both soft X-ray synchrotron photoemission (hv = 150 to 350 eV) and traditional Mg-K alpha XPS (hv = 1253.6 eV) whilst annealing incrementally to approximate to 510 degrees C in low pressures of O-2. In all cases, a Mn depleted and Sr rich surface oxide layer is observed, it is of reduced crystalline quality and is charge depleted. This surface layer is weakly affected by subsequent annealing, and is partially reversed by annealing in higher O-2 pressure. Surface carbon contamination is incrementally removed by annealing at increased temperatures, and at 270 degrees C, it is reduced to approximate to 0.4% of the topmost unit cell. The modification of the surface stoichiometry and electronic properties is consistent with the reported loss of magnetic properties in thin LSMO films. (C) 2012 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3079798
- author
- Monsen, A. F. ; Song, F. ; Li, Z. S. ; Boschker, J. E. ; Tybell, T. ; Wahlstrom, E. and Wells, Justin LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Synchrotron photoemission, XPS, LSMO: oxide
- in
- Surface Science
- volume
- 606
- issue
- 17-18
- pages
- 1360 - 1366
- publisher
- Elsevier
- external identifiers
-
- wos:000306823900006
- scopus:84862698966
- ISSN
- 0039-6028
- DOI
- 10.1016/j.susc.2012.04.018
- language
- English
- LU publication?
- yes
- id
- 01ee5765-47e4-4671-87fc-54c18bd13aea (old id 3079798)
- date added to LUP
- 2016-04-01 13:19:50
- date last changed
- 2022-01-27 18:35:28
@article{01ee5765-47e4-4671-87fc-54c18bd13aea,
abstract = {{We present a study of the surface stoichiometry and contamination of La0.7Sr0.3MnO3 thin films following exposure to air and subsequent in vacuo preparation. Samples were studied using both soft X-ray synchrotron photoemission (hv = 150 to 350 eV) and traditional Mg-K alpha XPS (hv = 1253.6 eV) whilst annealing incrementally to approximate to 510 degrees C in low pressures of O-2. In all cases, a Mn depleted and Sr rich surface oxide layer is observed, it is of reduced crystalline quality and is charge depleted. This surface layer is weakly affected by subsequent annealing, and is partially reversed by annealing in higher O-2 pressure. Surface carbon contamination is incrementally removed by annealing at increased temperatures, and at 270 degrees C, it is reduced to approximate to 0.4% of the topmost unit cell. The modification of the surface stoichiometry and electronic properties is consistent with the reported loss of magnetic properties in thin LSMO films. (C) 2012 Elsevier B.V. All rights reserved.}},
author = {{Monsen, A. F. and Song, F. and Li, Z. S. and Boschker, J. E. and Tybell, T. and Wahlstrom, E. and Wells, Justin}},
issn = {{0039-6028}},
keywords = {{Synchrotron photoemission; XPS; LSMO: oxide}},
language = {{eng}},
number = {{17-18}},
pages = {{1360--1366}},
publisher = {{Elsevier}},
series = {{Surface Science}},
title = {{Surface stoichiometry of La0.7Sr0.3MnO3 during in vacuo preparation; A synchrotron photoemission study}},
url = {{http://dx.doi.org/10.1016/j.susc.2012.04.018}},
doi = {{10.1016/j.susc.2012.04.018}},
volume = {{606}},
year = {{2012}},
}