Effects of oxygen-reducing atmosphere annealing on LaMnO${}_3$ epitaxial thin films

Abstract

We investigated the effects of annealing on LaMnO${}_3$ epitaxial thin films grown by pulsed laser deposition and propose an efficient method of characterizing their stoichiometry. Structural, magnetic, and optical properties coherently indicate non-stoichiometric ferromagnetic and semiconducting phases for as-grown LaMnO${}_3$ films. By annealing in an oxygen-reducing atmosphere, we recovered the antiferromagnetic and insulating phases of bulk-like stoichiometric LaMnO${}_3$. We show that non-destructive optical spectroscopy at room temperature is one of the most convenient tools for identifying the phases of LaMnO${}_3$ films. Our results serve as a prerequisite in studying LaMnO${}_3$ based heterostructures grown by pulsed laser deposition.

arXiv comment10 pages including 3 figures, accepted in J. Phys. D: Appl. Phys

References in corpus (5)

• The metal-insulator transition and its relation to magnetic structure in (LaMnO3)2n/(SrMnO3)n superlattices
• Effects of annealing and strain on La_{1-x}Ca_{x}MnO_{3} thin films: a new phase diagram in the ferromagnetic region
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices
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• Charge states and magnetic ordering in LaMnO3/SrTiO3 superlattices
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