Ordered Multiferroic Cofe2o4-Pb(Zr0.52ti0.48)O-3 Coaxial Nanotube Arrays With Enhanced Magnetoelectric Coupling

In this paper, vertically free-standing multiferroic CoFe2O4-Pb(Zr0.52Ti0.48)O-3 (CFO-PZT) coaxial nanotube arrays with both good ordering and high density were prepared by a template-assisted sol-gel method. Xray diffraction (XRD) and Raman spectra confirmed that the as-prepared CFO-PZT nanotubes (NTs) included both spinel CFO and perovskite PZT phases. The multiferroic properties were demonstrated by magnetic hysteresis and piezo-response force microscopy (PFM). We also observed an effective dielectric constant of about 0.8% between increasing and decreasing magnetic field, indicating that the ordered CFO-PZT coaxial nanotube arrays may enable potential high-density magnetoelectric (ME) devices.