Hydration of gadolinium oxide (Gd Ox ) and its effect on voltage-induced Co oxidation in a Pt /Co /Gd Ox/Au heterostructure
Abstract
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 /Gd Ox/Au , where Co is the magnetic layer and Gd Ox 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 Gd Ox properties on voltage-induced magnetic changes. In this work, we show that hydration of G d2O3 to form Gd (OH) 3 is crucial for voltage-induced Co oxidation in a Pt /Co /Gd Ox/Au device. By examining the rate of Co oxidation in nonhydrated and hydrated devices, we conclude that H2O in the Gd Ox 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.
- Publication:
-
Physical Review Materials
- Pub Date:
- June 2019
- DOI:
- 10.1103/PhysRevMaterials.3.064408
- Bibcode:
- 2019PhRvM...3f4408T