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journal article·2019-03-01Open access

Apparent auxetic to non-auxetic crossover driven by Co2+ redistribution in CoFe2O4 thin films

Elias Ferreiro-Vila, Lucia Iglesias, Irene Lucas del Pozo, Noa Varela-Dominguez, Cong Tinh Bui, Beatriz Rivas-Murias, Jose M. Vila-Fungueiriño, Pilar Jimenez-Cavero, Cesar Magen, Luis Morellon, Victor Pardo, Francisco Rivadulla

APL Materials· Volume 7· Issue 3
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Source abstract

Abstract

Oxide spinels of general formula AB2O4 (A = Mg2+, Fe2+; B = Al3+, Cr3+, etc.) constitute one of the most abundant crystalline structures in mineralogy. In this structure, cations distribute among octahedral and tetrahedral sites, according to their size and the crystal-field stabilization energy. The cationic arrangement determines the mechanical, magnetic, and transport properties of the spinel and can be influenced by external parameters like temperature, pressure, or epitaxial stress in the case of thin films. Here, we report a progressive change in the sign of the Poisson ratio, ν, in thin films of CoFe2O4, defining a smooth crossover from auxetic (ν < 0) to non-auxetic (ν > 0) behavior in response to epitaxial stress and temperature. Microstructural and magnetization studies, as well as ab initio calculations, demonstrate that such unusual elastic response is actually due to a progressive redistribution of Co2+ among the octahedral and tetrahedral sites of the spinel structure. The results presented in this work clarify a long standing controversy about the magnetic and elastic properties of Co-ferrites and are of general applicability for understanding the stress-relaxation mechanism in complex crystalline structures.
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Research context

OpenAlex topics: Shape Memory Alloy Transformations · Magnetic and transport properties of perovskites and related materials · Magnetic Properties of Alloys

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Universidade de Santiago de Compostela 1 , 15782 Santiago de Compostela, Spain

Instituto de Nanociencia de Aragón (INA), Departamento Física de la Materia Condensada, Universidad de Zaragoza 2 , 50018 Zaragoza, Spain

Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC 3 , Zaragoza, Spain and , 50009 Zaragoza, Spain

Departamento de Física de la Materia Condensada, Universidad de Zaragoza 3 , Zaragoza, Spain and , 50009 Zaragoza, Spain

Institut d’Électronique et des Systèmes (IES), UMR 5214, CNRS—Université de Montpellier 4 , 860 Rue Saint Priest, 34095 Montpellier, France

Departamento de Física Aplicada, Facultade de Física, Universidade de Santiago de Compostela 5 , 15782 Santiago de Compostela, Spain

Instituto de Investigacións Tecnolóxicas, Universidade de Santiago de Compostela 6 , 15782 Santiago de Compostela, Spain

Funding

Consellería de Cultura, Educación e Ordenación Universitaria, Xunta de Galicia · H2020 Marie Skłodowska-Curie Actions · Ministerio de Economía y Competitividad

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