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Interfacial reconstruction in La0.7Sr0.3MnO3 thin films: giant low-field magnetoresistance

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Abstract

Herein, interfacial reconstruction in a series of La0.7Sr0.3MnO3 (LSMO) films grown on a (001) oriented LaAlO3 (LAO) substrate using the pulsed plasma sputtering technique is demonstrated. X-ray diffraction studies suggested that the LSMO film on LAO was stabilized in a tetragonal structure, which was relaxed in-plane and strained along the out-of-plane direction. The interfacial reconstruction of the LSMO–LAO interface due to the reorientation of the Mn ion spin induced spin-glass behavior due to the presence of non-collinear Mn ion spins. Consequently, the interface effect was observed on the Curie temperature, temperature-dependent resistivity, metal-to-semiconductor transition temperature, and magnetoresistance (MR). At a magnetic field of 7 T, MR decreased from 99.8% to 7.69% as the LSMO film thickness increased from 200 Å to 500 Å. A unique characteristic of the LSMO films is the large low-field MR after a decrease in the field from the maximum field. The observed temperature-dependent magnetization and low-temperature resistivity upturn of the LSMO films grown on LAO provide direct evidence that the low-field MR is due to the non-collinear interfacial spins of Mn. The present work demonstrates the great potential of interface and large low-field MR, which might advance the fundamental applications of orbital physics and spintronics.

Graphical abstract: Interfacial reconstruction in La0.7Sr0.3MnO3 thin films: giant low-field magnetoresistance

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Supplementary files

Article information


Submitted
11 Apr 2020
Accepted
07 May 2020
First published
07 May 2020

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Paper

Interfacial reconstruction in La0.7Sr0.3MnO3 thin films: giant low-field magnetoresistance

U. K. Sinha, B. Das and P. Padhan, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/D0NA00287A

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