Polar-Graded Multiferroic SrMnO3 Thin Films
Guzmán Aluja, Roger ; Maurel Velázquez, Laura (Universidad de Zaragoza) ; Langenberg Pérez, Eric ; Lupini, Andrew R. ; Algarabel Lafuente, Pedro Antonio (Universidad de Zaragoza) ; Pardo Gracia, José Angel (Universidad de Zaragoza) ; Magén Domínguez, Cesar (Universidad de Zaragoza)
Resumen: Engineering defects and strains in oxides provides a promising route for the quest of thin film materials with coexisting ferroic orders, multiferroics, with efficient magnetoelectric coupling at room temperature. Precise control of the strain gradient would enable custom tailoring of the multiferroic properties but presently remains challenging. Here we explore the existence of a polar-graded state in epitaxially strained antiferromagnetic SrMnO3 thin films, whose polar nature was predicted theoretically and recently demonstrated experimentally. By means of aberration-corrected scanning transmission electron microscopy we map the polar rotation of the ferroelectric polarization with atomic resolution, both far from and near the domain walls, and find flexoelectricity resulting from vertical strain gradients. The origin of this particular strain state is a gradual distribution of oxygen vacancies across the film thickness, according to electron energy loss spectroscopy. Herein we present a chemistry-mediated route to induce polar rotations in oxygen-deficient multiferroic films, resulting in flexoelectric polar rotations and with potentially enhanced piezoelectricity.
Idioma: Inglés
DOI: 10.1021/acs.nanolett.5b04455
Año: 2016
Publicado en: NANO LETTERS 16, 4 (2016), 2221-2227
ISSN: 1530-6984
Financiación: info:eu-repo/grantAgreement/ES/DGA/E26-304043
Financiación: info:eu-repo/grantAgreement/EUR/FP7/ERC-StG-239739-STEMOX
Financiación: info:eu-repo/grantAgreement/EUR/FP7/312483-ESTEEM2
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-51982-C2
Tipo y forma: Article (PostPrint)
Área (Departamento): Física de la Materia Condensada (Departamento de Física de la Materia Condensada)
Área (Departamento): Ciencia de los Materiales e Ingeniería Metalúrgica (Departamento de Ciencia y Tecnología de Materiales y Fluidos)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
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Exportado de SIDERAL (2016-09-29-14:09:30)
Idioma: Inglés
DOI: 10.1021/acs.nanolett.5b04455
Año: 2016
Publicado en: NANO LETTERS 16, 4 (2016), 2221-2227
ISSN: 1530-6984
Financiación: info:eu-repo/grantAgreement/ES/DGA/E26-304043
Financiación: info:eu-repo/grantAgreement/EUR/FP7/ERC-StG-239739-STEMOX
Financiación: info:eu-repo/grantAgreement/EUR/FP7/312483-ESTEEM2
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-51982-C2
Tipo y forma: Article (PostPrint)
Área (Departamento): Física de la Materia Condensada (Departamento de Física de la Materia Condensada)
Área (Departamento): Ciencia de los Materiales e Ingeniería Metalúrgica (Departamento de Ciencia y Tecnología de Materiales y Fluidos)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. 0
Exportado de SIDERAL (2016-09-29-14:09:30)
Este artículo se encuentra en las siguientes colecciones:
Articles > Artículos por área > Ciencia de los Materiales e Ingeniería Metalúrgica
Articles > Artículos por área > Física de la Materia Condensada
Record created 2016-09-22, last modified 2016-10-06
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