Dielectric behavior and magnetical response for porous BFO thin films with various thicknesses over Pt/Ti/SiO2/Si substrate |
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| Affiliation: | 1. Department of Physics, Mepco Schlenk Engineering College, Sivakasi 626 005, Tamil Nadu, India;2. Department of Chemistry, Mepco Schlenk Engineering College, Sivakasi, 626 005, Tamil Nadu, India;1. Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China;2. Instrumental Analysis and Research Center, Institute of Materials, Shanghai University, 99 Shangda Road, Shanghai 200444, China;1. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, PR China;2. Chongqing Key Laboratory of Nano-Micro Composite Materials and Devices, Chongqing 401331, PR China |
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| Abstract: | A novel sol–gel method has been developed to deposit multiferroic nanocrystalline bismuth ferrite (BFO) thin films over Pt/Ti/SiO2/Si substrate by spin-coating technique with various thicknesses. It is found that the deposition parameters significantly influence the quality and the thickness of BiFeO3 films. The films are all uniform and adherent to Pt/Ti/SiO2/Si substrate. The spin-coated films are characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Atomic force microscope (AFM), photoluminescence spectroscopy (PL) and Fourier transform infrared spectroscopy (FTIR). Rhombohedral structure of BFO is confirmed from the XRD and FT-IR studies. The SEM image shows a porous structure formation of BFO over Pt/Ti/SiO2/Si substrate. The surface outgrowth for the films at various thicknesses is measured from root mean square (RMS) and surface roughness through AFM. The step height and the RMS are found to be high for the film at 500 nm in comparison with thickness of 200 nm. The influence of the dielectric properties of the porous BFO at different thicknesses is studied using LCRQ meter. Finally, the magnetic behavior of film is compared with M–H hysteresis loop and Magnetoresistance (MR) studies. |
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| Keywords: | Rhombohedral structure Porous Root mean square (RMS) Vibrating sample magnetometer (VSM) Magnetoresistance (MR) |
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