Magnetoelectric Studies of Close-Packed and Hierarchically Ordered CoFe 2 O 4 /Pb(Zr 0.52 Ti 0.48 )O 3 /La 0.6 Sr 0.4 Mn
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https://doi.org/10.1007/s11664-020-08520-0 Ó 2020 The Minerals, Metals & Materials Society
ASIAN CONSORTIUM ACCMS–INTERNATIONAL CONFERENCE ICMG 2020
Magnetoelectric Studies of Close-Packed and Hierarchically Ordered CoFe2O4/Pb(Zr0.52Ti0.48)O3/La0.6Sr0.4MnO3/LaNiO3 Multiferroic Thin Films SRIDEVI MEENACHISUNDARAM,1,4 NAOKI WAKIYA,1,2,3 CHELLAMUTHU MUTHAMIZHCHELVAN,4,6,7 PARTHASARATHI GANGOPADHYAY,5 NAONORI SAKAMOTO,2,3 and SURUTTAIYUDAIYAR PONNUSAMY4 1.—Graduate School of Science and Technology, Shizuoka University, Hamamatsu 4328561, Japan. 2.—Department of Electronics and Materials Science, Shizuoka University, Hamamatsu 432-8561, Japan. 3.—Research Institute of Electronics, Shizuoka University, Hamamatsu 432-8561, Japan. 4.—Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Chennai 603-203, India. 5.—Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603-102, India. 6.—e-mail: [email protected]. 7.—e-mail: [email protected]
Enhanced magnetoelectric effects in two-dimensional multiferroics promise greater interests for fundamental understanding and for device applications. To ameliorate properties and multifunctionality of magnetoelectric materials, highly ordered multiferroic thin films ought to be optimally designed with a high surface area and with a minimum contact area between the substrate and the films. Fabrication of hierarchically ordered, hemispherical closepacked free-standing multiferroic thin film structures of CoFe2O4 (CFO)/ Pb(Zr0.52Ti0.48)O3 (PZT)/La0.6Sr0.4MnO3 (LSMO)/LaNiO3 (LNO) on a Pt/Ti/ SiO2/Si substrate using a RF magnetron sputtering technique is reported here. The hemispherical space inside the shell structures, inherited from the spherical polymer, are shown by the cross-sectional scanning transmission electron microscopy. Importantly, the observed enhancement of remanent polarization is elucidated based on the facts, like the generation of a high level of compressive stress, a large thermal expansion coefficient of LSMO, and a minimal lattice mismatch with the PZT thin film. Key words: Hemispherical structure, multiferroic thin film, polarization, magnetron sputtering
INTRODUCTION Multiferroic composite thin films with potentially large magnetoelectric (ME) effects have attracted great research interest in the last few decades due to their multifunctional properties.1,2 Over the past decade of ME coupling studies, both cases of polarization induced by magnetostriction and the
(Received April 9, 2020; accepted September 23, 2020)
magnetization induced by piezostriction have been observed in Cr2O3.3 Most of the experimental pioneering work in ME coupling has focused on the bulk composite materials. To overcome the drawback of weak coupling due to the leakage current and to develop potential applications, a need for thin film heterostructures arises.4 ME heterostructure thin film comprises a magnetostrictive or piezostrictive layer along with a ferromagnetic or ferroelectric layer. These separated ME heterostructures show a greater
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