abstract
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.
keywords
TUNNEL-JUNCTIONS; ROOM-TEMPERATURE; MULTIFERROICS; INTERFACE; CERAMICS; LSGM
subject category
Science & Technology - Other Topics; Materials Science
authors
Amorim, CO; Figueiras, F; Amaral, JS; Vaghefi, PM; Tavares, PB; Correia, MR; Baghizadeh, A; Alves, E; Rocha, J; Amaral, VS
our authors
Ali Baghi Zadeh
Post-Doc Fellowship
Carlos Amorim
Post-Doc Fellowship
Fábio Gabriel Nazário Figueiras
Post-Doc Fellowship
João Cunha de Sequeira Amaral
Auxiliary Researcher
Pegah Mirzadeh Vaghefi
Post-Doc Fellowship
Vitor Brás Sequeira Amaral
Full professorProjects
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
MULTIFOX: Nanometric Probing and Modification of Multiferroic Oxides (PTDC/FIS/105416/2008)
Facing the challenges of characterizing novel thermal materials and processes (Heat@UA) (RECI/CTM-CER/0336/2012)
acknowledgements
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