Metal/SrTiO<sub>3</sub> two-dimensional electron gases for spin-to-charge conversion
ORAL
Abstract
An emerging direction in oxide research aims at probing interfaces with two-dimensional electron gases (2DEGs) possessing a finite Rashba spin-orbit coupling. This allows the interconversion of spin and charge through the direct and inverse Edelstein and spin Hall effects which play a key role for future spintronics devices. A very simple path to achieve SrTiO3-based 2DEGs is by deposition of reactive metals on SrTiO3. Here we compare the formation and properties of 2DEGs generated in SrTiO3 by the growth of Al, Ta, and Y ultrathin films by magnetron sputtering. X-ray photoelectron spectroscopy study revealed the quantification of reduced Ti states associated with 2DEG formation. The carrier densities are extracted from magnetotransport measurements. Finally, spin-charge conversion has been measured and compared between different metal/SrTiO3 systems by spin-pumping experiments where the samples were capped with an extra NiFe layer. The trends observed for different metal/SrTiO3 systems provide a systematic study as a function of the carrier density and the transparency of the metal oxide tunnel barrier.
*We thank FEINMAN Intel Science and Technolgy Center for providing the funding for the work. We further acknowledge I. Young, C. Lin, T. Gosavi, and D. Nikonov for discussion.
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Presenters
Srijani Mallik
CNRS/THALES
Unité Mixte de Physique CNRS/Thales, Universite Paris-Saclay
Authors
Srijani Mallik
CNRS/THALES
Unité Mixte de Physique CNRS/Thales, Universite Paris-Saclay
Luis Moreno
CNRS/THALES
Unité Mixte de Physique CNRS/Thales, Universite Paris-Saclay
