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Giant Room Temperature Interface Spin Hall and Inverse Spin Hall Effects
Lei Wang1,2, R J H Wesselink2, Yi Liu1,2
1The Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, 100875 Beijing, China.
Physical Review Letters
|May 28, 2016
Summary
Researchers studied the spin Hall effect in Pt|Py bilayers. They found a significant interface spin Hall angle that increases with temperature and dominates the inverse effect, crucial for future applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- The spin Hall effect (SHE) describes generating a transverse spin current from a charge current via spin-orbit coupling.
- The spin Hall angle (SHA) quantifies SHE efficiency, impacting spintronic device performance.
Purpose of the Study:
- Investigate the temperature dependence of SHA in Pt|Py bilayers.
- Quantify bulk and interface contributions to SHE and inverse SHE currents.
- Explore the implications of interface effects for spintronic applications.
Main Methods:
- Utilized a first-principles scattering approach for theoretical analysis.
- Studied Pt|Py (Py=Ni80Fe20) bilayers.
- Decomposed spin currents into bulk and interface components at room temperature.
Main Results:
- Observed a monotonically increasing SHA with temperature for bulk Pt.
- Found SHA to be proportional to resistivity in bulk Pt.
- Discovered a large interface SHA that dominates the total inverse SHE current.
Conclusions:
- The interface SHA plays a critical role in the inverse SHE, significantly exceeding bulk contributions.
- Temperature-dependent interface effects are key to understanding SHE in bilayers.
- The findings have major implications for designing efficient spintronic devices.
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