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Controlling spin current polarization through non-collinear antiferromagnetism
T Nan1, C X Quintela1, J Irwin2
1Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA.
Nature Communications
|September 17, 2020
Summary
Researchers controlled spin polarization using a non-collinear antiferromagnet, enabling efficient spintronics. This breakthrough in antiferromagnetic spintronics allows for unconventional spin-orbit torques, crucial for advanced electronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Spin-Hall effect enables charge-spin current interconversion, vital for spintronics.
- Achieving collinear spin polarization with magnetization is key for energy-efficient switching.
- Symmetry typically enforces orthogonal spin polarization, limiting applications.
Purpose of the Study:
- To demonstrate control over spin polarization direction.
- To explore the use of non-collinear antiferromagnets for novel spintronic functionalities.
- To enable high-efficiency antiferromagnetic spintronics.
Main Methods:
- Utilized a non-collinear antiferromagnet, Mn3GaN, with a triangular spin structure.
- Fabricated epitaxial Mn3GaN/permalloy heterostructures.
- Investigated spin-orbit torques at room temperature.
Main Results:
- Achieved control of spin polarization direction by reducing magnetic symmetry.
- Observed unconventional out-of-plane and Dresselhaus-like spin polarizations.
- Demonstrated spin-orbit torques forbidden in systems with two-fold rotational symmetry.
Conclusions:
- Spin-structure design offers a method for controlling spin-orbit torque.
- Non-collinear antiferromagnets like Mn3GaN are promising for advanced spintronics.
- This work paves the way for high-efficiency antiferromagnetic spintronic devices.
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