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Updated: Jul 6, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
Tailoring Interlayer Chiral Exchange by Azimuthal Symmetry Engineering
Yu-Hao Huang1, Jui-Hsu Han1, Wei-Bang Liao1
1Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
Researchers developed a method to tune interlayer DMI for spintronic devices. This technique enables field-free magnetization switching in magnetic random-access memory (MRAM), paving the way for advanced memory technologies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Interlayer Dzyaloshinskii-Moriya interaction (DMI) is crucial for chiral spin textures in spintronic devices.
- Existing research has focused on observing interlayer DMI, with limited strategies for controlling its magnitude.
- Controlling interlayer DMI is essential for practical applications like magnetic random-access memory (MRAM).
Purpose of the Study:
- To introduce a novel protocol for engineering and controlling interlayer DMI magnitude.
- To demonstrate the application of this protocol in achieving field-free spin-orbit torque (SOT) magnetization switching.
- To provide guidelines for manipulating interlayer DMI for future spintronic device designs.
Main Methods:
- Developed an azimuthal symmetry engineering protocol.
- Utilized wedge deposition of separate layers to tune interlayer DMI.
- Investigated field-free SOT magnetization switching in orthogonally magnetized and synthetic antiferromagnetically coupled systems.
Main Results:
- Successfully demonstrated additive/subtractive tuning of interlayer DMI magnitude.
- Achieved field-free SOT magnetization switching in relevant material systems.
- Showcased suppression of spatial inhomogeneity through specific azimuthal engineering designs.
Conclusions:
- The developed protocol offers effective manipulation of interlayer DMI strength.
- Findings are beneficial for the future design of SOT-MRAM and other spintronic devices utilizing interlayer DMI.
- Azimuthal symmetry engineering provides a pathway for practical implementation of controlled DMI.
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