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Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
Published on: November 17, 2013
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Controllable positive exchange bias via redox-driven oxygen migration
Dustin A Gilbert1,2, Justin Olamit1, Randy K Dumas1,3
1Physics Department, University of California, Davis, One Shields Avenue, Davis, California 95616, USA.
Nature Communications
|March 22, 2016
Summary
Researchers observed oxygen migration in gadolinium/nickel cobalt oxide films, creating an interfacial layer that controls magnetic properties. This ionic transport offers a new way to tune material characteristics in heterostructures.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- Ionic transport in metal/oxide heterostructures is key for tuning material properties by modifying interfaces.
- Directly observing ionic motion and its link to physical properties at buried interfaces remains challenging.
Purpose of the Study:
- To investigate ionic transport and its impact on interfacial characteristics and magnetic properties in GdxFe1-x/NiCoO bilayer films.
- To demonstrate a method for controlling exchange bias through engineered interfacial layers.
Main Methods:
- Fabrication of GdxFe1-x/NiCoO bilayer films.
- Utilizing the strong oxygen affinity of gadolinium to drive oxygen migration.
- Characterization of ionic motion and resulting interfacial layer formation.
- Measurement of exchange bias properties.
Main Results:
- Observed and confirmed oxygen migration from NiCoO to gadolinium.
- Demonstrated controlled positive exchange bias linked to an interfacial layer of elemental nickel and cobalt.
- Identified the interfacial layer's moments as larger than expected from uncompensated NiCoO.
Conclusions:
- Redox-driven oxygen migration during film growth effectively creates a tunable interfacial layer.
- This ionic transport mechanism provides a pathway to tailor interfacial characteristics and interlayer exchange coupling in heterostructures.
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