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Strain-induced modulation of oxygen vacancies and magnetic properties in La0.5Sr0.5MnO3 thin films

Published online by Cambridge University Press:  07 November 2016

Ji Ma
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Yujun Zhang
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Liang Wu
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Chuangye Song
Affiliation:
Department of Physics, Beijing Normal University, Beijing 100875, China
Qinghua Zhang
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Jinxing Zhang
Affiliation:
Department of Physics, Beijing Normal University, Beijing 100875, China
Jing Ma*
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Ce-Wen Nan
Affiliation:
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
*
Address all correspondence to Jing Ma at ma-jing@tsinghua.edu.cn
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Abstract

Oxygen vacancies have a significant impact on the structure and electrical/magnetic properties of doped manganites. Magnetic La0.5Sr0.5MnO3 (LSMO) films were epitaxial grown on (001) SrTiO3 substrate by pulsed laser deposition. Structural studies from the x-ray diffraction suggest that the as-grown films are fully constrained by the substrate with the thickness ranging from 8 to 40 nm. By examining the valence of Mn by x-ray photoelectron spectroscopy and x-ray absorption spectroscopy, we find the ratio of Mn4+/Mn3+ increases along with the increased film thickness, which implies that the oxygen vacancies concentration induced by tensile strain correspondingly decreases. Therefore, the magnetization of LSMO is depressed with the exchange bias effect arising, and the electrical conductivity decreases significantly. This work builds a bridge between modulation of electric/magnetic properties and epitaxial strain in LSMO films.

Type
Functional Oxides Research Letters
Copyright
Copyright © Materials Research Society 2016 

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