Comprehensive Demonstration of Spin Hall Hanle Effects in Epitaxial Pt Films
ORAL
Abstract
We demonstrate a nonlinear Hall effect due to the boundary spin accumulation in Pt films grown
on Al2O3 substrates. This Hall effect and the previously demonstrated Hanle magnetoresistance
provide a complete picture of the spin-precession control of the spin and charge transport at the
boundary of a spin-orbit coupled material, which we refer to as spin-Hall Hanle effects (SHHE).
We also show that the SHHE can be employed to measure the spin diffusion length, the spin-
Hall angle, and the spin relaxation time of heavy metal without the need of magnetic interface or
the input from other measurements. The comprehensive demonstration of SHHE in such a simple
system suggests they may be ubiquitous and needs to be considered for unravelling the spin and
charge transport in more complex thin film structures of spin-orbit coupled materials.
on Al2O3 substrates. This Hall effect and the previously demonstrated Hanle magnetoresistance
provide a complete picture of the spin-precession control of the spin and charge transport at the
boundary of a spin-orbit coupled material, which we refer to as spin-Hall Hanle effects (SHHE).
We also show that the SHHE can be employed to measure the spin diffusion length, the spin-
Hall angle, and the spin relaxation time of heavy metal without the need of magnetic interface or
the input from other measurements. The comprehensive demonstration of SHHE in such a simple
system suggests they may be ubiquitous and needs to be considered for unravelling the spin and
charge transport in more complex thin film structures of spin-orbit coupled materials.
*This research was primarily supported by the U.S. Department of Energy (DOE), Office ofScience, Basic Energy Sciences (BES), under Award No. DE-SC0019173. The work at NC Statewas supported by the U.S. Department of Energy (DOE), Office of Science, Basic EnergySciences (BES), under Award No. DE-SC0020992. The research was performed in part in theNebraska Nanoscale Facility: National Nanotechnology Coordinated Infrastructure and theNebraska Center for Materials and Nanoscience (and/or NERCF), which are supported by theNational Science Foundation under Award ECCS: 1542182, and the Nebraska ResearchInitiative.
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Presenters
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Andrew H Comstock
- North Carolina State University