This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1017/S1431927609090229 in citations.
Mn valancy at La_0.7Sr_0.3MnO-3/SrTiO_3 (001) thin film interfaces
Mn valancy at La_0.7Sr_0.3MnO-3/SrTiO_3 (001) thin film interfaces
This article presents a (scanning) transmission electron microscopy (TEM) study of Mn valency and its structural origin at La 0.7 Sr 0.3 MnO 3/SrTiO3(0 0 1) thin film interfaces. Mn valency deviations can lead to a breakdown of ferromagnetic order and thus lower the tunneling magnetoresistance of tu...
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Personal Name(s): | Riedl, Th. |
---|---|
Gemming, Th. / Dörr, K. / Luysberg, M. / Wetzig, K. | |
Contributing Institute: |
Mikrostrukturforschung; IFF-8 |
Published in: | Microscopy and microanalysis, 15 (2009) S. 213 - 221 |
Imprint: |
New York, NY
Cambridge University Press
2009
|
Physical Description: |
213 - 221 |
PubMed ID: |
19460177 |
DOI: |
10.1017/S1431927609090229 |
Document Type: |
Journal Article |
Research Program: |
Erneuerbare Energien |
Series Title: |
Microscopy and Microanalysis
15 |
Subject (ZB): | |
Publikationsportal JuSER |
This article presents a (scanning) transmission electron microscopy (TEM) study of Mn valency and its structural origin at La 0.7 Sr 0.3 MnO 3/SrTiO3(0 0 1) thin film interfaces. Mn valency deviations can lead to a breakdown of ferromagnetic order and thus lower the tunneling magnetoresistance of tunnel junctions. Here, at the interface, a Mn valency reduction of 0.16 +/- 0.10 compared to the film interior and an additional feature at the low energy-loss flank of the Mn-L3 line have been observed. The latter may be attributed to an elongation of the (0 0 1) plane spacing at the interface detected by geometrical phase analysis of high-resolution images. Regarding the interface geometry, high-resolution high-angle annular dark-field scanning TEM images reveal an atomically sharp interface in some regions whereas the transition appears broadened in others. This can be explained by the presence of steps. The performed measurements indicate that, among the various structure-related influences on the valency, the atomic layer termination and the local oxygen content are most important. |