A phenomenological model for the magnetodielectric effect in magnetoelectric composites

Author(s)

Carvalho, R. A. R. ; Bonini, R. P. ; Barbosa, V. M. F. ; Botero, E. R. ; Alkathy, Mahmoud S. ; Eiras, J. A. ; Zabotto, F. L.

• Document type: Journal article
• Source: Journal of Magnetism and Magnetic Materials; v. 580, p. 5-pg., 2023-06-07.

Abstract

This paper proposes a phenomenological description for the nonlinear dielectric permittivity dependence on magnetic field, also called Magnetodielectric (MD) Effect, in strain mediated magnetoelectric composites. The description is derived by incorporating the dielectric dependence on electric polarization, thermodynamic constitutive equations, and magneto-mechanical effects. Moreover, the proposed expression successfully re-produces the experimental behavior reported in existing literature and can provide an explanation for the observed anisotropic effect. Simulations performed using the derived expression demonstrate an inherent cor-relation between the coupling of piezoelectric and magnetostrictive coefficients and the observed MD coefficient curves as measured in experiments. The validity of the model was verified by application to KNN/CFO and KNN/ NFO multiferroic particulate composite samples. (AU)

• FAPESP's process: 19/03110-8 - Synthesis and photovoltaic characterization of thin films based on ferroelectric and multiferroic perovskite for solar cells application
• Grantee: Mahmoud Saleh Mohammed Alkathy
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 20/06570-7 - Determination of the magnetoelectric coupling by analysis of the ferroelectric polarization curve in magnetoelectric and heterostructured systems
• Grantee: Rodrigo Ambrosio Rodrigues de Carvalho
• Support Opportunities: Scholarships in Brazil - Scientific Initiation