Magnetism and multiferroic properties at MnTiO3 surfaces: A DFT study

Autor(es)

Ribeiro, Renan A. P. ^[1] ; Andres, Juan ^[2] ; Longo, Elson ^[3] ; Lazaro, Sergio R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Ponta Grossa, Dept Chem, Av Gen Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, PR - Brazil

^[2] Univ Jaume 1, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain

^[3] Univ Fed Sao Carlos, CDMF UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 452, p. 463-472, SEP 15 2018.
• Citações Web of Science: 9

Resumo

The present study illustrates how density functional theory calculations can rationalize the surface structure and magnetism for the low-index (1 1 0), (1 0 1), (1 0 0), (0 0 1), (1 1 1), and (0 1 2) surfaces of MnTiO3. A simple procedure, without surface reconstructions or chemical adsorptions in which the stability, magnetism and the morphological transformations is presented in detail to clarify the control of their multiferroic nature. The surface stability was found to be controlled by the octahedral {[}MnO6] and {[}TiO6] clusters formed by the Mn2+ and Ti4+ cations - i.e., their local coordination at the surfaces, respectively-with nonpolar (1 1 0) being the most stable. Enhanced superficial magnetism was found for (0 1 2), (0 0 1), and (1 1 1) surfaces in agreement with the more undercoordinated {[}TiOn]' and {[}MnOn](.) complex clusters at the surface plane. Our calculation suggests the existence of magnetic {[}TiOn]' species for unstable (0 0 1) and (1 1 1) surfaces, explained by the unusual crystalfield associated with the surface environment. The crystal morphology has been predicted to determine the most likely terminations to be present as well as the intrinsic magnetization density associated with morphologies. Moreover, the (0 0 1) surface plane plays a key role in the enhancement of the magnetic properties for shape-oriented MnTiO3 nanoparticles, suggesting a superior magnetoelectric coupling due to the presence of uncompensated spins and polar distortions perpendicular to the surface plane. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs