Controllable positive exchange bias via redox-driven oxygen migration
Abstract
We report that ionic transport in metal/oxide heterostructures offers a highly effective means to tailor material properties via modification of the interfacial characteristics. However, direct observation of ionic motion under buried interfaces and demonstration of its correlation with physical properties has been challenging. Using the strong oxygen affinity of gadolinium, we design a model system of GdxFe1-x/NiCoO bilayer films, where the oxygen migration is observed and manifested in a controlled positive exchange bias over a relatively small cooling field range. The exchange bias characteristics are shown to be the result of an interfacial layer of elemental nickel and cobalt, a few nanometres in thickness, whose moments are larger than expected from uncompensated NiCoO moments. This interface layer is attributed to a redox-driven oxygen migration from NiCoO to the gadolinium, during growth or soon after. Ultimately, these results demonstrate an effective path to tailoring the interfacial characteristics and interlayer exchange coupling in metal/oxide heterostructures.
- Authors:
-
[1];
[2]
- Univ. of California, Davis, CA (United States). Dept. of Physics; NIST Center for Neutron Research, Gaithersburg, MD (United States)
- Univ. of California, Davis, CA (United States)
- Univ. of California, Davis, CA (United States); Univ. of Gothenburg (Sweden)
- NIST Center for Neutron Research, Gaithersburg, MD (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1252983
- Grant/Contract Number:
- AC02-05CH11231; DMR-1008791; ECCS-1232275; DMR-1543582
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 7; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Gilbert, Dustin A., Olamit, Justin, Dumas, Randy K., Kirby, B. J., Grutter, Alexander J., Maranville, Brian B., Arenholz, Elke, Borchers, Julie A., and Liu, Kai. Controllable positive exchange bias via redox-driven oxygen migration. United States: N. p., 2016.
Web. doi:10.1038/ncomms11050.
Gilbert, Dustin A., Olamit, Justin, Dumas, Randy K., Kirby, B. J., Grutter, Alexander J., Maranville, Brian B., Arenholz, Elke, Borchers, Julie A., & Liu, Kai. Controllable positive exchange bias via redox-driven oxygen migration. United States. https://doi.org/10.1038/ncomms11050
Gilbert, Dustin A., Olamit, Justin, Dumas, Randy K., Kirby, B. J., Grutter, Alexander J., Maranville, Brian B., Arenholz, Elke, Borchers, Julie A., and Liu, Kai. Mon .
"Controllable positive exchange bias via redox-driven oxygen migration". United States. https://doi.org/10.1038/ncomms11050. https://www.osti.gov/servlets/purl/1252983.
@article{osti_1252983,
title = {Controllable positive exchange bias via redox-driven oxygen migration},
author = {Gilbert, Dustin A. and Olamit, Justin and Dumas, Randy K. and Kirby, B. J. and Grutter, Alexander J. and Maranville, Brian B. and Arenholz, Elke and Borchers, Julie A. and Liu, Kai},
abstractNote = {We report that ionic transport in metal/oxide heterostructures offers a highly effective means to tailor material properties via modification of the interfacial characteristics. However, direct observation of ionic motion under buried interfaces and demonstration of its correlation with physical properties has been challenging. Using the strong oxygen affinity of gadolinium, we design a model system of GdxFe1-x/NiCoO bilayer films, where the oxygen migration is observed and manifested in a controlled positive exchange bias over a relatively small cooling field range. The exchange bias characteristics are shown to be the result of an interfacial layer of elemental nickel and cobalt, a few nanometres in thickness, whose moments are larger than expected from uncompensated NiCoO moments. This interface layer is attributed to a redox-driven oxygen migration from NiCoO to the gadolinium, during growth or soon after. Ultimately, these results demonstrate an effective path to tailoring the interfacial characteristics and interlayer exchange coupling in metal/oxide heterostructures.},
doi = {10.1038/ncomms11050},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Mon Mar 21 00:00:00 EDT 2016},
month = {Mon Mar 21 00:00:00 EDT 2016}
}
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