Control of Magnetic Anisotropy in Strained La2/3Sr1/3MnO3 Films by a BaTiO3 Overlayer in an Artificial Multiferroic System

John E Ordoñez; Lorena Marin; Luis A Rodriguez; Pedro A Algarabel; Jose A Pardo; Roger Guzmán; Luis Morellón; César Magén; Etienne Snoeck; Maria E Gomez; Manuel R Ibarra

doi:10.3762/bxiv.2019.130.v1

Control of Magnetic Anisotropy in Strained La_2/3Sr_1/3MnO₃ Films by a BaTiO₃ Overlayer in an Artificial Multiferroic System

John E Ordoñez ,
Lorena Marin ,
Luis A Rodriguez ,
Pedro A Algarabel ,
Jose A Pardo ,
Roger Guzmán ,
Luis Morellón ,
César Magén ,
Etienne Snoeck ,
Maria E Gomez and
Manuel R Ibarra

Submitting author affiliation:

Grupo de Peliculas Delgadas, Universidad del Valle, Cali, valle del Cauca, Colombia

Beilstein Arch. 2019, 2019130. https://doi.org/10.3762/bxiv.2019.130.v1

Published 25 Oct 2019

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Read the peer-reviewed version of this preprint: https://doi.org/10.3762/bjnano.11.51

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Show All Preprints Nanotechnology Organic chemistry Bioorganic chemistry / chemical biology Catalysis Chemical methods and reactions Flow and process chemistry Green and sustainable chemistry Materials chemistry Medicinal and pharmaceutical chemistry Nano- and molecular-scale electronics Nano-biomaterials and bioscience Nanomagnetics Nanomaterials, thin films and nanointerfaces Nanomedicine Nanometrology and nanomechanics Nano-optics Nanopatterning, self-assembly and nanofabrication Nanostructures for energy and sensing applications Natural products chemistry Organo main group chemistry Other nanotechnology (unclassified) Other organic chemistry (unclassified) Photochemistry and photovoltaics Physical organic chemistry Supramolecular chemistry

Abstract

We studied in detail the in-plane magnetic properties in heterostructures based on a ferroelectric BaTiO₃ overlayer deposited on a ferromagnetic La_2/3Sr_1/3MnO₃ film grown on pseudocubic (001)-oriented SrTiO₃, (LaAlO₃)_0.3(Sr₂TaAlO₆)_0.7 and LaAlO₃ substrates. In this configuration, the combination of both functional perovskites constitutes an artificial multiferroic system with potential applications in spintronic devices based on the magnetoelectric effect. We have grown the La_2/3Sr_1/3MnO₃ single layers and BaTiO₃/La_2/3Sr_1/3MnO₃ bilayers by pulsed-laser deposition technique. We analyzed the films structurally through X-ray reciprocal space maps, and high-angle annular dark field microscopy; magnetically, via thermal demagnetization curves and in-plane magnetization versus applied magnetic field loops, at room temperature. Our results indicate that the BaTiO₃ layer induces an additional strain in the La_2/3Sr_1/3MnO₃ layers close to their common interface. We observed that the presence of BaTiO₃ on the surface of tensile-strained La_2/3Sr_1/3MnO₃ films transforms the in-plane biaxial magnetic anisotropy present in the single layer towards an in-plane uniaxial magnetic anisotropy. Our experimental evidence suggests that this change in the magnetic anisotropy only occurs in tensile-strained La_2/3Sr_1/3MnO₃ film and is favored by an additional strain on the La_2/3Sr_1/3MnO₃ layer promoted by BaTiO₃ film. These findings reveal an additional mechanism that alters the magnetic behavior of the ferromagnetic layer and, consequently, deserves future in-depth research to determine how it can modify the magnetoelectric coupling of this hybrid multiferroic system.

Keywords: Interface-induced strain, magnetic anisotropy, artificial multiferroic system, BaTiO₃, La_2/3Sr_1/3MnO₃.

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Ordoñez, J. E.; Marin, L.; Rodriguez, L. A.; Algarabel, P. A.; Pardo, J. A.; Guzmán, R.; Morellón, L.; Magén, C.; Snoeck, E.; Gomez, M. E.; Ibarra, M. R. Beilstein Arch. 2019, 2019130. doi:10.3762/bxiv.2019.130.v1

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