Hydration of gadolinium oxide ( Gd O x ) and its effect on voltage-induced Co oxidation in a Pt / Co / Gd O x / Au heterostructure
Name
PhysRevMaterials.3.064408.pdf
Description
Published version
Size
1.02 MB
Format
Adobe PDF
Checksum (MD5)
7eb07230c148dccbf9b3702559b59b5b
Author(s)
Tan, Aik Jun
Huang, Mantao
Sheffels, Sara
Büttner, Felix
Kim, Sunho
Hunt, Adrian H
Waluyo, Iradwikanari
Tuller, Harry L
Beach, Geoffrey SD
Date Issued
2019
Journal
Physical Review Materials
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 American Physical Society. Magneto-ionic control of magnetism has garnered great interest in recent years due to the large magnetic changes that can be induced using a relatively small voltage. One model structure for this is Pt/Co/GdOx/Au, where Co is the magnetic layer and GdOx is the ionic conductor, with the magnetic properties dependent on the oxidation state of Co. While this structure is commonly used, there is limited understanding of the effect of GdOx properties on voltage-induced magnetic changes. In this work, we show that hydration of Gd2O3 to form Gd(OH)3 is crucial for voltage-induced Co oxidation in a Pt/Co/GdOx/Au device. By examining the rate of Co oxidation in nonhydrated and hydrated devices, we conclude that H2O in the GdOx layer acts as an oxidant during the voltage-induced Co oxidation process. Co oxidation through this interfacial reaction process is confirmed by in situ x-ray absorption spectroscopy.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevMaterials.3.064408
