Abstract
In this study, we investigate the interfacial structures and chemistry of FeV2O4 (FVO)/ SrTiO3 (STO) and FeV2O4/La0.33Sr0.67MnO3/SrTiO3 (FVO/LSMO/STO) heterostructures, in which FVO is epitaxially grown on both a (001)-oriented SrTiO3 substrate and a LSMO-buffered substrate by pulsed laser deposition (PLD). By combining data from transmission electron microscopy (TEM) imaging together with high-resolution scanning transmission electron microscopy (STEM) imaging, the interfaces between FVO and STO, and FVO and LSMO are found to be coherent and semicoherent, respectively, in spite of more than 8% of strain at the interface. Energy-dispersive X-ray spectroscopy (EDS) analysis suggests that localised diffusion occurs at both the FVO/STO and the FVO/LSMO interfaces.
Highlights
Non-collinear multiferroics (NCMs) are a new class of functional oxides with significant potential in spintronic and nanoelectric application devices, due to their magnetoelectric coupling effects
We investigate the interfacial structures and chemistry of FeV2O4 (FVO)/ SrTiO3 (STO) and FeV2O4/La0.33Sr0.67MnO3/SrTiO3 (FVO/LSMO/STO) heterostructures, in which FVO is epitaxially grown on both a (001)-oriented SrTiO3 substrate and a LSMO-buffered substrate by pulsed laser deposition (PLD)
Their crystal structures and surface morphologies were examined by X-ray diffraction (XRD) and atomic force microscopy (AFM) prior to transmission electron microscopy (TEM) sample preparation
Summary
Non-collinear multiferroics (NCMs) are a new class of functional oxides with significant potential in spintronic and nanoelectric application devices, due to their magnetoelectric coupling effects. NCMs produce magnetoelectric coupling by possessing both ferroelectric and ferromagnetic ordering at low temperatures. An NCM, such as FeV2O4 (FVO), is a multiferroic which undergoes successive phase transitions and possesses both ferroelectric and ferrimagnetic moments at low temperatures [1, 2]. A NCM thin film grown on a ferromagnetic or piezoelectric substrate will lead to large electrical and magnetic properties of the constituent epitaxial thin films [4]. In such thin film heterostructures, the relative lattice parameters of both the substrate and buffer layers play an important role in determining the strain and the structure of the epitaxial thin films. Epitaxial FVO-based heterostructures were produced by depositing the FVO films onto the STO substrate with, and without, a buffer layer of La0.33Sr0.67MnO3
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