Origin of insulating weak-ferromagnetic phase in ultra-thin La0.67Sr0.33MnO3 films on SrTiO3 substrate

Title
Origin of insulating weak-ferromagnetic phase in ultra-thin La0.67Sr0.33MnO3 films on SrTiO3 substrate
Authors
백승협김신익Yun Li최은영박승영조영훈서지원
Issue Date
2017-08
Publisher
AIP advances
Citation
VOL 7, NO 8, 085224-1
Abstract
We investigate the origin of insulating weak-ferromagnetic phase in ultra-thin epitaxial La0.67Sr0.33MnO3 (LSMO) films on SrTiO3 substrate using density functional theory calculation together with X-ray linear dichroism (XLD). The calculations show that symmetry breaking of the crystal field at the LSMO surface largely lowers the energy level of Mn d3z(2) orbital at the surface and leads to full occupancy of the d3z(2) orbital in majority spin channel, and XLD spectra clearly show the preferential occupation of Mn d3z(2) orbital at the surface. Such an orbital reconstruction and charge redistribution in the ultra-thin films largely suppresses double-exchange interaction and favors super-exchange interaction, resulting in G-type antiferromagnetic spin ordering and insulating state. The anisotropic exchange interaction due to spin-orbital interaction leads to spin canting, and thus the films showweak ferromagnetism. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
URI
http://pubs.kist.re.kr/handle/201004/66442
ISSN
2158-3226
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KIST Publication > Article
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