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Spin-to-Charge Conversion in Bi Films and Bi/Ag Bilayers
Di Yue1,2,3, Weiwei Lin1, Jiajia Li2,3
1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Physical Review Letters
|August 8, 2018
Summary
Researchers investigated pure spin current phenomena in bismuth (Bi) and bismuth/silver (Bi/Ag) structures. They found minimal spin-to-charge conversion, contrary to previous claims, with only a Nernst signal detected in the Bi layer.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Pure spin current phenomena are crucial for spintronics applications.
- The inverse Rashba-Edelstein effect (iREE) is a key mechanism for spin-to-charge conversion.
- Previous studies claimed iREE in bismuth-based heterostructures.
Purpose of the Study:
- To investigate thermally injected pure spin current phenomena in Bi/Y3Fe5O12 and Bi/Ag/Y3Fe5O12 structures.
- To evaluate the spin-to-charge conversion efficiency in these systems.
- To clarify the discrepancy with previously reported iREE.
Main Methods:
- Fabrication of Bi/Y3Fe5O12 and Bi/Ag/Y3Fe5O12 heterostructures.
- Thermal injection of pure spin currents.
- Measurement of spin-to-charge conversion signals.
- Analysis of the Nernst signal.
Main Results:
- Pure spin current was successfully injected into Bi and Bi/Ag layers.
- A distinct Nernst signal was observed from the Bi layer.
- Little to no detectable spin-to-charge conversion signal was found, contradicting iREE claims.
- The results highlight the importance of careful characterization of spin-charge conversion.
Conclusions:
- The study challenges the reported inverse Rashba-Edelstein effect in Bi/Y3Fe5O12 and Bi/Ag/Y3Fe5O12 systems.
- The observed Nernst signal in Bi is distinct from spin-to-charge conversion.
- Further research is needed to understand spin dynamics and conversion mechanisms in these materials.
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