Room temperature nonlinear magnetoelectric effect in lead-free and Nb-doped AlFeO3 compositions

Autor(es)

Cotica, Luiz F. ^{[1, 2]} ; Santos, Guilherme M. ^[1] ; Freitas, Valdirlei F. ^[3] ; Coelho, Adelino A. ^[4] ; Pal, Madhuparna ^[2] ; Santos, Ivair A. ^[1] ; Garcia, Ducinei ^[5] ; Eiras, Jose A. ^[5] ; Guo, Ruyan ^[2] ; Bhalla, Amar S. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Maringa, Dept Phys, BR-87020900 Maringa, Parana - Brazil

^[2] Univ Texas San Antonio, Dept Elect & Comp Engn, San Antonio, TX 78249 - USA

^[3] Univ Estadual Centro Oeste, Dept Phys, BR-85040080 Guarapuava, PR - Brazil

^[4] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

^[5] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 117, n. 6 FEB 14 2015.
• Citações Web of Science: 2

Resumo

It is still a challenging problem to obtain technologically useful materials displaying strong magnetoelectric coupling at room temperature. In the search for new effects and materials to achieve this kind of coupling, a nonlinear magnetoelectric effect was proposed in the magnetically disordered relaxor ferroelectric materials. In this context, the aluminum iron oxide ( AlFeO3), a room temperature ferroelectric relaxor and magnetic spin glass compound, emerges as an attractive lead-free magnetoelectric material along with nonlinear magnetoelectric effects. In this work, static, dynamic, and temperature dependent ferroic and magnetoelectric properties in lead-free AlFeO3 and 2 at.% Nb-doped AlFeO3 multiferroic magnetoelectric compositions are studied. Pyroelectric and magnetic measurements show changes in ferroelectric and magnetic states close to each other ( similar to 200 K). The magnetoelectric coefficient behavior as a function of Hbias suggests a room temperature nonlinear magnetoelectric coupling in both single-phase and Nb-doped AlFeO3-based ceramic compositions. (C) 2015 AIP Publishing LLC. (AU)

• Processo FAPESP: 08/04025-0 - Materiais multifuncionais multiferróicos nanoestruturados: síntese, propriedades, fenomenologia e aplicações
• Beneficiário: José Antonio Eiras
• Modalidade de apoio: Auxílio à Pesquisa - Temático