Intrinsic contributions to magnetoelectric coupling coefficients in single phase multiferroics

• Grant number: 12/07936-9
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: August 11, 2012
• End date: August 10, 2013
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: José Antonio Eiras
• Grantee: Barbara Maraston Fraygola
• Supervisor: Nava Setter
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Institution abroad: École Polytechnique Fédérale de Lausanne (EPFL), Switzerland
• Associated to the scholarship: 10/11187-6 - Determination of the magnetoelectric coupling coefficient in single phase multiferroic materials, BP.PD

Abstract

Actually, many researches about magnetoelectric materials and their evolution during the last 50 years were presented, approaching since the discovery of the first ferroelectromagnetics by Smolenskii and co-workers, in 50 decades, to the most current effects in multiferroic with improper ferroelectricity. The theory explains qualitatively the magnetoelectric effect, mainly from the thermodynamic point of view, as well as provides new phenomena. Subsequently, new classes of multiferroics have been developed, including materials where the ferroelectric polarization is induced by a magnetic order spiral, or by electronic order. Due to the small values of the order parameters measured in these new types of materials, experimental techniques have been improved. Despite this, from fundamental point of view, there remain several open issues in single-phase multiferroic of the simplest structural kind, like materials with perovskite structure. The main objective of this project is investigating the fundamental mechanisms involved in the magnetoelectric effect. In this regard, we will attempt to propose microscopic phenomenological model for this type of coupling, based on experimental results on the individual couplings (magnetostriction - piezoelectricity). Magnetoelectrics properties will be analyzed from the point of view of the piezoelectric and magnetostricves properties in an attempt to understand how each individual contributes to the coupling mechanism and which parameters influence the elastic behavior. Likewise, maximizing the individual properties, it is possible to maximize the resulting coefficient. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SAHINI, MTABAZI G.; GRANDE, TOR; FRAYGOLA, BARBARA; BIANCOLI, ALBERTO; DAMJANOVIC, DRAGAN; SETTER, NAVA. Solid Solutions of Lead Metaniobate-Stabilization of the Ferroelectric Polymorph and the Effect on the Lattice Parameters, Dielectric, Ferroelectric, and Piezoelectric Properties. Journal of the American Ceramic Society, v. 97, n. 1, p. 220-227, JAN 2014. (12/07936-9)