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Unconventional Spin Currents in Noncollinear Antiferromagnet Mn3Ge
Cuimei Cao1, Shiwei Chen2,3, Nian Xie4
1School of Integrated Circuits and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
Nano Letters
|June 2, 2025
Summary
Researchers generated unconventional spin-orbit torques in Mn3Ge, enabling energy-efficient spintronic device control. This paves the way for advanced neuromorphic computing and memory applications.
Area of Science:
- Spintronics
- Materials Science
- Condensed Matter Physics
Background:
- Unconventional spin-orbit torque (SOT) is crucial for energy-efficient magnetization control in spintronic devices.
- Noncollinear antiferromagnets (NCAFs) are promising for generating unconventional SOTs.
- Mn3Ge is a material of interest for spintronic applications.
Purpose of the Study:
- To investigate the generation of spin torques in noncollinear antiferromagnetic Mn3Ge.
- To demonstrate all-electric SOT switching in a Mn3Ge-based device.
- To explore the potential of Mn3Ge devices for neuromorphic computing.
Main Methods:
- Spin-torque ferromagnetic resonance (ST-FMR) technique was used to detect unconventional spin polarizations.
- All-electric SOT switching was performed on a Mn3Ge device with perpendicular magnetic anisotropy (PMA).
- Memristive behavior was analyzed for emulation of artificial synapses.
Main Results:
- Unconventional spin polarizations (x- and z-polarized spin currents) were observed in Mn3Ge.
- Successful all-electric SOT switching was achieved with a critical current density of 4.2 × 10^6 A/cm^2.
- The Mn3Ge device demonstrated memristive behavior, emulating artificial synapses with 92.5% accuracy in CNN tasks.
Conclusions:
- Mn3Ge is a viable material for generating unconventional SOTs.
- All-electric SOT switching and memristive behavior in Mn3Ge devices are demonstrated.
- These findings support the development of energy-efficient spintronic memory and neuromorphic computing.
Keywords:
all-electric SOT switchingnoncollinear antiferromagnetspin−orbit torquesynaptic plasticityunconventional spin torqueMore Related Videos
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