Universität zu Köln

Li, Xiaoyan, Lindfors-Vrejoiu, Ionela, Ziese, Michael ORCID: 0000-0003-4600-1095, Gloter, Alexandre and van Aken, Peter A. ORCID: 0000-0003-1890-1256 (2017). Impact of interfacial coupling of oxygen octahedra on ferromagnetic order in La0.7Sr0.3MnO3/SrTiO3 heterostructures. Sci Rep, 7. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

La0.7Sr0.3MnO3, a half-metallic ferromagnet with full spin polarization, is generally used as a standard spin injector in heterostructures. However, the magnetism of La0.7Sr0.3MnO3 is strongly modified near interfaces, which was addressed as dead-layer phenomenon whose origin is still controversial. Here, both magnetic and structural properties of La0.7Sr0.3MnO3/SrTiO3 heterostructures were investigated, with emphasis on the quantitative analysis of oxygen octahedral rotation (OOR) across interfaces using annular-bright-field imaging. OOR was found to be significantly altered near interface for both La0.7Sr0.3MnO3 and SrTiO3, as linked to the magnetism deterioration. Especially in La-0.7Sr0.3MnO3/SrTiO3 superlattices, the almost complete suppression of OOR in 4 unit-cell-thick La0.7Sr0.3MnO3 results in a canted ferromagnetism. Detailed comparisons between strain and OOR relaxation and especially the observation of an unexpected La0.7Sr0.3MnO3 lattice c expansion near interfaces, prove the relevance of OOR for the magnetic properties. These results indicate the capability of tuning the magnetism by engineering OOR at the atomic scale.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Li, Xiaoyan UNSPECIFIED UNSPECIFIED UNSPECIFIED Lindfors-Vrejoiu, Ionela UNSPECIFIED UNSPECIFIED UNSPECIFIED Ziese, Michael UNSPECIFIED orcid.org/0000-0003-4600-1095 UNSPECIFIED Gloter, Alexandre UNSPECIFIED UNSPECIFIED UNSPECIFIED van Aken, Peter A. UNSPECIFIED orcid.org/0000-0003-1890-1256 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-242586
DOI:	10.1038/srep40068
Journal or Publication Title:	Sci Rep
Volume:	7
Date:	2017
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THIN-FILMS; PHASE; SPIN; MAGNETOTRANSPORT; LA2/3SR1/3MNO3; POLARIZATION; TEMPERATURE; MANGANITES; DEPENDENCE; ANISOTROPY Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24258