Reversible Control of Magnetism in La0.67Sr0.33MnO3 through Chemically-Induced Oxygen Migration

Published

February 24, 2016

Author(s)

Alexander J. Grutter, Dustin A. Gilbert, U. S. Alaan, E. Arenholz, Brian B. Maranville, Julie A. Borchers, Y. Suzuki, Kai Liu, Brian J. Kirby

Abstract

We demonstrate reversible control of magnetization and anisotropy in La_0.67Sr_0.33MnO₃ films through interfacial oxygen migration. Gd metal capping layers deposited onto La_0.67Sr_0.33MnO₃ leach Oxygen from the film through a solid-state redox reaction to form porous Gd₂O₃. X-ray absorption and polarized neutron reflectometry measurements show Mn valence alterations consistent wit high oxygen vacancy concentrations, resulting in suppressed magnetization and increased coercive fields. Effects of they oxygen migration are observed both at the interface and also throughout the majority of a 40 nm thick film, suggesting extensive diffusion of oxygen vacancies. After Gd-capped La_0.67Sr_.0.33MnO₃ is exposed to atmospheric oxygen for a prolonged period of time, oxygen diffuses through the Gd layer and the magnetization of the La_0.67Sr_0.33MnO₃ returns to the uncapped value. These findings showcase perovskite heterostructures as ideal candidates for developing functional interfaces through chemically-induced oxygen migration.

Citation

Applied Physics Letters

Volume

108

Issue

8

Pub Type

Journals

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Keywords

Oxide, Magnetism, Interface, Thin Film, Perovskite, Gadolinium

Citation

Grutter, A. , Gilbert, D. , , U. , Arenholz, E. , , B. , Borchers, J. , Suzuki, Y. , Liu, K. and Kirby, B. (2016), Reversible Control of Magnetism in La_0.67Sr_0.33MnO₃ through Chemically-Induced Oxygen Migration, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919832 (Accessed April 23, 2024)