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Title: Hydration of gadolinium oxide ( Gd O x ) and its effect on voltage-induced Co oxidation in a Pt / Co / Gd O x / 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/GdO x/Au , where Co is the magnetic layer and GdO x 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 GdO x properties on voltage-induced magnetic changes. In this work, we show that hydration of Gd 2O 3 to form Gd(OH) 3 is crucial for voltage-induced Co oxidation in a Pt/Co/GdO x/Au device. By examining the rate of Co oxidation in nonhydrated and hydrated devices, we conclude that H 2O in the GdO x 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.

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [3];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1543413
Alternate Identifier(s):
OSTI ID: 1526659
Report Number(s):
[BNL-211908-2019-JAAM]
[Journal ID: ISSN 2475-9953; PRMHAR]
Grant/Contract Number:  
[SC0012704]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
[ Journal Volume: 3; Journal Issue: 6]; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Tan, Aik Jun, Huang, Mantao, Sheffels, Sara, Büttner, Felix, Kim, Sunho, Hunt, Adrian H., Waluyo, Iradwikanari, Tuller, Harry L., and Beach, Geoffrey S. D. Hydration of gadolinium oxide ( GdOx ) and its effect on voltage-induced Co oxidation in a Pt/Co/GdOx/Au heterostructure. United States: N. p., 2019. Web. doi:10.1103/PhysRevMaterials.3.064408.
Tan, Aik Jun, Huang, Mantao, Sheffels, Sara, Büttner, Felix, Kim, Sunho, Hunt, Adrian H., Waluyo, Iradwikanari, Tuller, Harry L., & Beach, Geoffrey S. D. Hydration of gadolinium oxide ( GdOx ) and its effect on voltage-induced Co oxidation in a Pt/Co/GdOx/Au heterostructure. United States. doi:10.1103/PhysRevMaterials.3.064408.
Tan, Aik Jun, Huang, Mantao, Sheffels, Sara, Büttner, Felix, Kim, Sunho, Hunt, Adrian H., Waluyo, Iradwikanari, Tuller, Harry L., and Beach, Geoffrey S. D. Mon . "Hydration of gadolinium oxide ( GdOx ) and its effect on voltage-induced Co oxidation in a Pt/Co/GdOx/Au heterostructure". United States. doi:10.1103/PhysRevMaterials.3.064408.
@article{osti_1543413,
title = {Hydration of gadolinium oxide ( GdOx ) and its effect on voltage-induced Co oxidation in a Pt/Co/GdOx/Au heterostructure},
author = {Tan, Aik Jun and Huang, Mantao and Sheffels, Sara and Büttner, Felix and Kim, Sunho and Hunt, Adrian H. and Waluyo, Iradwikanari and Tuller, Harry L. and Beach, Geoffrey S. D.},
abstractNote = {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.},
doi = {10.1103/PhysRevMaterials.3.064408},
journal = {Physical Review Materials},
number = [6],
volume = [3],
place = {United States},
year = {2019},
month = {6}
}

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