Effect of the CoFe2O4 thin film thickness on multiferroic property of (00l)-oriented Pb(Zr0.5Ti0.5)O3∕CoFe2O4∕Pb(Zr0.5Ti0.5)O3 trilayer structure

Abstract

In this study, we have fabricated (00l)-oriented Pb(Zr0.5Ti0.5)O3∕CoFe2O4∕Pb(Zr0.5Ti0.5)O3 (PZT/CFO/PZT) trilayer thin films on LaNiO3 coated substrates by dual-cathode rf sputtering system. The thicknesses of top and bottom PZT thin films were fixed at 100nm but those of the CFO interlayer were 40, 80, and 120nm, respectively. The x-ray diffraction showed well-defined PZT and CFO peaks with (00l) orientation, and large grains with columnar structure were observed by field-emission scanning electron microscopy. Hard-magnetic M-H loop with a saturation magnetization of ∼235emu∕cm3 and ferroelectric hysteresis curve with saturation polarization of ∼40.1μC∕cm2 were measured at room temperature for the PZT/CFO (120 nm)/PZT trilayer thin films. Due to the low-resistance CFO interlayer in series with the PZT layers, the ferroelectric property does not significantly vary with the CFO interlayer thickness. In contrast, the possibility of the existence of nonmagnetic interfacial layer at the CFO/PZT interface causes the reduction of the magnetization. Both of the good magnetic and ferroelectric responses suggest that the (00l)-oriented PZT/CFO/PZT trilayer thin film is a promising magnetoeletric material for study.

Orientation dependence of magnetoelectric coefficient in BaTiO3/CoFe2O4

“…1). Likewise, Lin et al 18 and Deng et al 19 Furthermore, we derive a general condition which piezoelectric/magnetostrictive composite materials belonging to the point group of 4mm/m3m must fulfill to exhibit the maximum α E 33 in certain directions.…”

Synthesis and characterization of multiferroic Pb(Zr,Ti)O₃/CoFe₂O₄/Pb(Zr,Ti)O₃ layered composite thin films by chemical solution deposition

“…In this case, the tendency of the P-E loop change by the introduction of the CFO layer is hardly affected by a volume of the CFO layer. The non-ferroelectric CFO intermediate layer introduces a significant effect which increases the coercive field owing to stress and several defects formation, thereby affecting the domain switching of the ferroelectric PZT layer, especially near the interface region as reported by R. Lin et al 18) In addition, although the decrease of electrical polarization is observed as described above, the ferroelectric properties shown in Fig. 5 are superior to those of previously reported PZT/CFO multilayer thin films deposited by dual-cathode RF sputtering.…”

“…5 are superior to those of previously reported PZT/CFO multilayer thin films deposited by dual-cathode RF sputtering. 18), 19) The field-induced strain behaviors of single-layered perovskite PZT and PZT/CFO/PZT layered thin films were examined using a single-beam laser Doppler interferometer. Figure 6 shows the electric-field-induced displacement curves of PZT and PZT/ CFO/PZT (CFO: 3 coatings) at room temperature and 100 Hz driving frequency.…”

Effect of Strain on Ferroelectric and Magnetic Behavior in Pb(Zr0.52Ti0.48)O3-Based Magnetoelectric Heterostructures

“…[1][2][3] In comparison to bulk composite, the epitaxial PZT/ferrite multilayers based on the FE/FM exchange coupled heterostructure may exhibit complex crystal structures and strong sensitivity of their physical properties to subtle structural changes, which may offer an opportunities to explore and manipulate the coupling properties of FE/FM composites. Recently, research efforts have been made on the study of epitaxial PZT/CoFe 2 O 4 (CFO) nanostructures and multilayers grown on various substrates.…”

“…Recently, research efforts have been made on the study of epitaxial PZT/CoFe 2 O 4 (CFO) nanostructures and multilayers grown on various substrates. [3][4][5][6][7] Size effect and residual stress are found to play an important role in governing electronic, magnetic and other coupling properties of PZT/CFO heterostructures. 3 7 8 Most recently, * Author to whom correspondence should be addressed.…”