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Spin-Polarized Current in Noncollinear Antiferromagnets
Jakub Železný1,2, Yang Zhang1,3, Claudia Felser1
1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
Physical Review Letters
|December 9, 2017
Summary
Noncollinear antiferromagnets exhibit spin-polarized currents, similar to ferromagnets. This study reveals a novel transverse spin current mechanism with potential applications in spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Noncollinear antiferromagnets (e.g., Mn3Sn, Mn3Ir) exhibit a large anomalous Hall effect, analogous to ferromagnets.
- Previous research highlighted similarities between these antiferromagnets and ferromagnets regarding their electronic properties.
Purpose of the Study:
- To investigate spin polarization in the charge current of noncollinear antiferromagnets.
- To identify and characterize a novel transverse spin current.
- To explore potential applications of these spin currents in spintronic devices.
Main Methods:
- Ab initio microscopic calculations.
- Symmetry analysis of spin currents.
Main Results:
- Demonstrated that charge currents in noncollinear antiferromagnets are spin-polarized.
- Identified a transverse spin current arising from the same mechanism, distinct from the conventional spin Hall effect.
- Established the unique symmetry and origin of this transverse spin current.
Conclusions:
- Noncollinear antiferromagnets possess spin-polarized charge currents and novel transverse spin currents.
- These findings offer new avenues for spintronic applications, including antiferromagnetic metallic and tunneling junctions.
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