resumo
We report polycrystalline BaTiO3 with cooperative magnetization behavior associated with the scarce presence of about 113 atomic ppm of Fe ions, clearly displaying magnetoelectric coupling with significant changes in magnetization (up to Delta M/M approximate to 32%) at the ferroelectric transitions. We find that Fe ions are segregated mostly at the interfaces between grain boundaries and an Fe-rich phase, forming a self-composite with high magnetoelectric coupling above room temperature. We compare our results with ab initio calculations and other experimental results found in the literature, proposing mechanisms that could be behind the magnetoelectric coupling within the ferroelectric matrix. These findings open the way for further strategies to optimize interfacial magnetoelectric couplings.
palavras-chave
TUNNEL-JUNCTIONS; ROOM-TEMPERATURE; MULTIFERROICS; INTERFACE; CERAMICS; LSGM
categoria
Science & Technology - Other Topics; Materials Science
autores
Amorim, CO; Figueiras, F; Amaral, JS; Vaghefi, PM; Tavares, PB; Correia, MR; Baghizadeh, A; Alves, E; Rocha, J; Amaral, VS
nossos autores
Ali Baghi Zadeh
Bolseiro de pós-Doutoramento
Carlos Amorim
Investigador Auxiliar
Fábio Gabriel Nazário Figueiras
Bolseiro de pós-Doutoramento
João Cunha de Sequeira Amaral
Investigador Auxiliar
Pegah Mirzadeh Vaghefi
Bolseiro de pós-Doutoramento
Vitor Brás Sequeira Amaral
Professor CatedráticoGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G6 - Materiais Virtuais e Inteligência Artificial
Projectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
MULTIFOX: Nanometric Probing and Modification of Multiferroic Oxides (PTDC/FIS/105416/2008)
agradecimentos
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (ref. FCT UID/CTM/50011/2013), financed by national funds through FCT/MEC and, when applicable, cofinanced by FEDER under the PT2020 Partnership Agreement. We are thankful for financial support from FCT Projects PTDC/FIS/105416/2008