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Tunable interfacial Dzyaloshinskii-Moriya interaction in symmetrical Au/[Fe/Au] multilayers
1School of Physics, State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, China. skang@sdu.edu.cn.
Nanoscale
|January 26, 2021
Summary
Researchers enhanced the interfacial Dzyaloshinskii-Moriya interaction (i-DMI) in symmetrical gold/iron multilayers. Tuning i-DMI chirality via tensile stress offers a simple method for skyrmion-based device applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- The interfacial Dzyaloshinskii-Moriya interaction (i-DMI) is crucial for stabilizing magnetic skyrmions.
- Controlling i-DMI in multilayer systems is essential for advanced spintronic devices.
- Symmetrical structures offer potential for simplified device fabrication.
Purpose of the Study:
- To investigate the enhancement and tunability of i-DMI in symmetrical Au/[Fe/Au]n structures.
- To explore the role of tensile stress in modifying i-DMI chirality.
- To provide a straightforward method for i-DMI control in multilayer systems.
Main Methods:
- Fabrication of as-made symmetrical Au/[Fe/Au]n multilayer structures.
- Tailoring the chirality of the i-DMI at the Au/Fe interface.
- Utilizing layer-resolved Dzyaloshinskii-Moriya interaction calculations.
- Analyzing the impact of tensile stress induced by lattice mismatch.
Main Results:
- An overall enhancement of i-DMI was achieved in symmetrical Au/[Fe/Au]n structures.
- The i-DMI chirality was successfully tuned by adjusting the stacking number 'n'.
- Tensile stress at the bottom Fe layer induced a chirality reversal from left-handed to right-handed.
- Spin-orbit coupling energy sign change in Au near the interface under tensile stress was identified as the mechanism.
Conclusions:
- A simple and effective method for tuning i-DMI in multilayer systems was demonstrated.
- The findings facilitate the application of i-DMI in skyrmion-based devices.
- Tensile stress provides a viable route to control magnetic chirality at interfaces.
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