resumo
A study on magnetoelectric phenomena in the barium titanate-barium hexaferrite (BaTiO3-BaFe12O19) composite system, using high resolution techniques including switching spectroscopy piezoresponse force microscopy (SSPFM) and spatially resolved confocal Raman microscopy (CRM), is presented. It is found that both the local piezoelectric coefficient and polarization switching parameters change on the application of an external magnetic field. The latter effect is rationalized by the influence of magnetostrictive stress on the domain dynamics. Processing of the Raman spectral data using principal component analysis (PCA) and self-modelling curve resolution (SMCR) allowed us to achieve high resolution phase distribution maps along with separation of average and localized spectral components. A significant effect of the magnetic field on the Raman spectra of the BaTiO3 phase has been revealed. The observed changes are comparable with the classical pressure dependent studies on BaTiO3, confirming the strain mediated character of the magnetoelectric coupling in the studied composites.
palavras-chave
PIEZORESPONSE FORCE MICROSCOPY; HIGH-PRESSURE RAMAN; FERROELECTRIC MATERIALS; POLARIZATION; BATIO3; FIELD; NANOCOMPOSITE
categoria
Chemistry; Science & Technology - Other Topics; Materials Science; Physics
autores
Trivedi, H; Shvartsman, VV; Lupascu, DC; Medeiros, MSA; Pullar, RC; Kholkin, AL; Zelenovskiy, P; Sosnovskikh, A; Shur, VY
nossos autores
Andrei Kholkin
Investigador Jubilado
Marco Sílvio Assamo Medeiros
Estudante de doutoramento
Rob Pullar
ColaboradorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
agradecimentos
This work was supported by the European Commission within the FP7 Marie Curie Initial Training Network