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Critical Spin Fluctuation Mechanism for the Spin Hall Effect
Satoshi Okamoto1, Takeshi Egami1,2,3, Naoto Nagaosa4,5
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Physical Review Letters
|November 26, 2019
Summary
We propose new mechanisms for the spin Hall effect in metals, explaining how dynamic magnetic fluctuations influence conductivity. This effect is enhanced at higher temperatures near magnetic instability, observable in 4d or 5d metals.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- The spin Hall effect (SHE) is crucial for spintronic devices.
- Understanding SHE mechanisms in metallic systems is essential for technological advancement.
Purpose of the Study:
- To propose novel mechanisms for the spin Hall effect in metallic systems.
- To investigate the role of dynamically fluctuating local magnetic moments in SHE.
- To explore the temperature dependence of spin Hall conductivity.
Main Methods:
- Theoretical modeling of electron-electron interactions.
- Analysis of side-jump and skew-scattering mechanisms.
- Investigating the influence of dynamic spin fluctuations.
Main Results:
- Dynamical spin fluctuations lead to a nontrivial temperature dependence of spin Hall conductivity.
- Spin Hall conductivity is enhanced at nonzero temperatures near ferromagnetic instability.
- Proposed mechanisms are applicable to 4d or 5d metallic compounds.
Conclusions:
- Dynamic magnetic fluctuations provide a key mechanism for SHE in metals.
- The temperature dependence of SHE offers a route to experimental verification.
- Findings could guide the development of new spintronic materials.
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