Room temperature multiferroism in polycrystalline thin films of gallium ferrite

Abstract

We have synthesized (010) textured polycrystalline thin films of gallium ferrite (GaFeO3 or GFO) on nSi(100) and Pt/Si(111) substrates using sol-gel assisted spin coating technique. Structural characterization using x-ray diffraction and Raman spectroscopy confirms formation of single phase with crystallite size similar to 37-47 nm. Magnetic characterization demonstrates saturated magnetic hysteresis loop at room temperature and indicates that due to reduced crystallite size, ferri to pararnagnetic transition temperature, Tc similar to similar to 300 K is higher compared to bulk GFO, reported earlier. Room temperature piezo-response force microscopic analysis reveals local similar to 180 degrees phase switching of ferroelectric domains at very high coercive field, similar to 700 kV/cm, consistent with recent experimental and first -principles studies. Our study opens up the possibility of integrating polycrystalline GFO in novel room temperature multiferroic devices (C) 2017 Elsevier B.V. All rights reserved.