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Structural and magnetic depth profiles of magneto-ionic heterostructures beyond the interface limit
Dustin A Gilbert1, Alexander J Grutter2, Elke Arenholz3
1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, 20899, Maryland, USA. dustin.gilbert@nist.gov.
Nature Communications
|July 23, 2016
Summary
Voltage-driven oxygen migration in AlOx/GdOx/Co films controls magnetism beyond interfaces. This magneto-ionic effect offers new pathways for low-power information storage and sensors.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Electric field control of magnetism is key for low-power electronics.
- Magneto-ionic motion, particularly oxygen migration, influences interface properties.
Purpose of the Study:
- To demonstrate magnetoelectric coupling via voltage-driven oxygen migration in AlOx/GdOx/Co films.
- To investigate oxygen migration beyond the interface and its effect on bulk magnetism.
Main Methods:
- Polarized neutron reflectometry for mapping oxygen migration and Co magnetization.
- Magnetometry and X-ray spectroscopy for microstructural and chemical state analysis.
Main Results:
- Voltage-driven oxygen migration was observed to extend beyond the interface into thicker films.
- Semi-reversible control of Co magnetization was achieved.
- Microstructural changes and formation of a magnetically soft phase were detected.
- X-ray spectroscopy confirmed changes in Co oxidation state, indicating oxygen transmission through GdOx.
Conclusions:
- Magneto-ionic motion can effectively control magnetism both at interfaces and in the bulk of films.
- This provides crucial insights for developing advanced magnetic storage and sensor technologies.
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