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Inverse spin Hall effect in a ferromagnetic metal
1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Physical Review Letters
|August 27, 2013
Summary
Researchers observed the inverse spin Hall effect (ISHE) in ferromagnetic permalloy (Py) on yttrium iron garnet (YIG). This finding opens new possibilities for pure spin current detectors and spintronic applications.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- The inverse spin Hall effect (ISHE) is typically observed in nonmagnetic metals with strong spin-orbit coupling.
- Previous studies have limited ISHE observation to nonmagnetic materials like platinum and gold.
Purpose of the Study:
- To demonstrate the inverse spin Hall effect (ISHE) in a ferromagnetic metal.
- To explore the potential of ferromagnetic materials for spin current detection.
Main Methods:
- Investigated ISHE in a permalloy (Py) on yttrium iron garnet (YIG) heterostructure.
- Controlled spin current injection by modifying the Py-YIG interface.
- Determined the spin Hall angle in Py films of varying thicknesses.
Main Results:
- Successfully observed ISHE in a ferromagnetic metal (permalloy).
- Demonstrated ISHE as the reciprocal phenomenon of the anomalous Hall effect.
- Quantified a significant spin Hall angle in permalloy.
Conclusions:
- Ferromagnetic metals can exhibit the inverse spin Hall effect.
- Permalloy shows promise as a sensitive pure spin current detector.
- The findings suggest broader applications for ferromagnetic metals in spintronics.
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