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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin Hall effects in metallic antiferromagnets.
Wei Zhang1, Matthias B Jungfleisch1, Wanjun Jiang1
1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Physical Review Letters
|November 22, 2014
Summary
We studied four metallic antiferromagnets for spin current detection. Platinum-manganese (PtMn) showed the highest spin Hall effect, indicating potential for advanced spintronics applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Metallic antiferromagnets are promising for spintronics due to their vanishingly small stray fields.
- Spin current detection is crucial for developing next-generation electronic devices.
Purpose of the Study:
- To evaluate four CuAu-I-type metallic antiferromagnets (FeMn, PdMn, IrMn, PtMn) as spin current detectors.
- To understand the relationship between material properties and spin Hall effect magnitude.
Main Methods:
- Spin pumping and inverse spin Hall effect measurements were employed.
- Thickness-dependent measurements were conducted to determine spin diffusion lengths.
- First-principles calculations were used for comparison.
Main Results:
- Nontrivial spin Hall effects were observed in FeMn, PdMn, and IrMn.
- Platinum-manganese (PtMn) exhibited a significantly higher spin Hall effect.
- Spin diffusion lengths were found to be short, around 1 nm.
- A clear correlation was established between spin-orbit coupling and the spin Hall effect magnitude.
Conclusions:
- The spin Hall effect in these antiferromagnetic alloys is strongly influenced by the spin-orbit coupling of nonmagnetic elements.
- PtMn demonstrates superior performance as a spin current detector among the studied materials.
- Engineering antiferromagnetic properties and interfaces is key for advancing antiferromagnet-based spintronics.
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