Polarization-induced selective growth of single-crystal heterostructured multiferroic nanoplates with giant magnetoelectric coupling

• Published in: Journal of alloys and compounds Vol. 787; pp. 476 - 482
• Main Authors: Chao, Chunying, Ren, Zhaohui, Li, Hao, Gao, Yuanhao, Han, Gaorong
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 30.05.2019; Elsevier BV
• Subjects: Cobalt ferrites; Composite materials; Coupling; Crystal growth; Crystals; Epitaxial growth; Ferroelectric materials; Ferroelectricity; Heterostructured nanoplate; Lead titanates; Magnetization; Magnetoelectric coupling; Multiferroic composites; Multiferroic materials; Nanoparticles; Phase transitions; Selectively grow; Single crystals; Substrates; Temperature dependence; Selectively grow; Heterostructured nanoplate; Magnetoelectric coupling; Multiferroic composites
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.02.115

Single-crystal heterostructured multiferroic (PbTiO3) PTO-(CoFe2O4) CFO nanoplate composites were prepared by a simple two-step hydrothermal process. The CFO nanoparticles with the size of 20–80 nm selectively grow on the positively polarized surface of the single-crystal and single-domain PTO nanoplate. The TEM results demonstrate an epitaxial growth relation between the PTO nanoplates and CFO nanoparticles. The results of the temperature-dependence magnetization of the composites under zero field cooled (ZFC) condition show a novel broad diffuse region around the PTO ferroelectric phase transition (Tc) for the first time. The total change of magnetization (Δ M) near Tc is determined to be (2.71 ± 0.5) × 10−3 emu, a change of 46.2%, implying a giant magnetoelectric coupling in these single-crystal heterostructured multiferroic PTO-CFO nanoplate composites. Such effect has been attributed to the absence of the substrate clamping and single domain in ferroelectric PTO nanoplate. [Display omitted] •Heterostructured PbTiO3-CoFe2O4 nanoplates composites were prepared by a simple hydrothermal process.•CoFe2O4 nanoparticles selectively grow on the positively polarized surface of PbTiO3 nonaplate.•The heterostructured PbTiO3-CoFe2O4 nanoplates composites show a giant magnetoelectric coupling.