Peculiar Magnetoelectric Coupling in BaTiO3:Fe-113 ppm Nanoscopic Segregations
authors Amorim, CO; Figueiras, F; Amaral, JS; Vaghefi, PM; Tavares, PB; Correia, MR; Baghizadeh, A; Alves, E; Rocha, J; Amaral, VS
nationality International
journal ACS APPLIED MATERIALS & INTERFACES
author keywords multiferroic; magnetoelectric; BaTiO3:Fe; magnetism; interfaces; autocomposite; nanoscopic segregations
keywords TUNNEL-JUNCTIONS; ROOM-TEMPERATURE; MULTIFERROICS; INTERFACE; CERAMICS; LSGM
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.
publisher AMER CHEMICAL SOC
issn 1944-8244
year published 2015
volume 7
issue 44
beginning page 24741
ending page 24747
digital object identifier (doi) 10.1021/acsami.5b07462
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000364726400042

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