Abstract
Advanced oxides are the current focus of intense research activity, driven by their numerous attractive properties for next generation microelectronics. However, reliable strategies must be developed for the electrical contacting of such films without compromising their functionality. We explore the effect of depositing both noble and oxidising metals onto the ferromagnetic La0.7Sr0.3MnO3 (LSMO) in terms of its structural and magnetic properties. Whilst noble metal overlayers have negligible impact, the metals typically used as adhesion layers, such as Ti, can drive a structural phase transition in the LSMO, producing a Brownmillerite phase and impairing the magnetisation.
Highlights
Functional oxides are promising candidates for generation microelectronics owing to their wide range of ferroelectric, ferromagnetic and potential emergent interfacial properties such as interfacial superconductivity [1]
All metaloxide systems rely on smooth interfaces, good electrical contact and a lack of interfacial chemical reactions, a complete understanding of the metallisation of functional oxides is essential for metal-oxide hybrid devices to be fully realised
The superconducting quantum interference device (SQUID) measurements indicate a slight reduction in magnetic moment for a Cu contact and the LSMO crystal structure appears more diffuse, with a dark narrow band of intensity appearing at the Cu/LSMO interface in high angle annular dark field (HAADF) imaging
Summary
Functional oxides are promising candidates for generation microelectronics owing to their wide range of ferroelectric, ferromagnetic and potential emergent interfacial properties such as interfacial superconductivity (within heterostructures) [1]. We present a systematic study of the magnetic and structural effects of depositing metal contacts onto La0.7Sr0.3MnO3 (LSMO) thin films using transmission electron microscopy (TEM) and superconducting quantum interference device (SQUID) magnetometry.
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