Magnetoelectric coupling at room temperature in LaTiO3/ SrTiO3 heterojunctions

Author(s)

Simoes, A. Z. ; Ortega, P. P. ; Ramirez, M. A. ; Moreno, H. ; Aldao, C. M. ; Ponce, M. A. ; Moura, F.

• Document type: Journal article
• Source: Materials Research Bulletin; v. 162, p. 8-pg., 2023-01-30.

Abstract

This work focuses on LaTiO3 (LTO) thin films synthesized by the polymeric precursor method and deposited onto SrTiO3 (STO) substrates via spin coating. The results show interesting coexisting ferromagnetic (Mr approximate to 2.85 emu/g) - ferroelectric (Pr approximate to 18.5 mu C/cm2) responses at room temperature. Magnetoelectric coupling can be observed under DC bias magnetic field (14 V/cm.Oe), and its dielectric constant is affected by the coupling between magnetic and electric dipoles at room temperature as well as oxygen octahedra distortion along direction a. Little film-substrate mismatch significantly influences the system dielectric properties. Our results suggest the possibility to induce ferromagnetic/ferroelectric phases in the LTO/STO heterojunctions using an electric/magnetic field, respectively, due to the magnetoelectric coupling. This study also helps comprehend oxygen vacancy dynamics when applying a tensile strain or an external electric field, which is fundamental for actuators, switches, magnetic field sensors, and new types of electronic memory devices. (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 19/07413-5 - New approaches toward the application of complex oxide thin films in correlated electron random access memories
• Grantee: Alexandre Zirpoli Simões
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 18/18236-4 - Development of advanced CaCu3Ti4O12 ceramics in the form of powders, bulks, and nanostructured films: an integrated studied of its multifunctional properties
• Grantee: Henrique Piccoli Moreno
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)