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Title: Room-temperature charge-to-spin conversion from quasi-2D electron gas at SrTiO₃-based interfaces
Authors: Shashank, Utkarsh
Deka, Angshuman
Ye, Chen
Gupta, Surbhi
Medwal, Rohit
Rawat, Rajdeep Singh
Asada, Hironori
Wang, Renshaw Xiao
Fukuma, Yasuhiro
Keywords: Science::Physics
Issue Date: 2022
Source: Shashank, U., Deka, A., Ye, C., Gupta, S., Medwal, R., Rawat, R. S., Asada, H., Wang, R. X. & Fukuma, Y. (2022). Room-temperature charge-to-spin conversion from quasi-2D electron gas at SrTiO₃-based interfaces. Physica Status Solidi - Rapid Research Letters.
Project: MOE-T2EP50220-0005
MOE2019-T2-1-058 (ARC 1/19 RSR)
Journal: Physica Status Solidi - Rapid Research Letters
Abstract: Interfacial two-dimensional electron gases (2DEG), especially the SrTiO3-based ones at the unexpected interface of insulators, have emerged to be promising candidates for efficient charge–spin interconversion. Herein, to gain insight into the mechanism of the charge–spin interconversion, quasi-2DEG between insulating SrTiO3 and two types of aluminum-based amorphous insulators, namely SrTiO3/AlN and SrTiO3/Al2O3, are focused on and their charge-to-spin conversion efficiency is estimated. The two types of amorphous insulators are selected to probe the overlooked contribution of oxygen vacancy. A mechanism to explain the results of spin–torque ferromagnetic resonance measurements is proposed and an analysis protocol to reliably estimate in quasi-2DEG is developed. The resultant, thickness of the 2DEG, is estimated to be 0.244 and 0.101 nm−1 for SrTiO3/AlN and SrTiO3/Al2O3, respectively, which are strikingly comparable to their crystalline counterparts. Furthermore, a large direct current modulation of resonance linewidth in SrTiO3/AlN samples is developed, confirming and attesting an oxygen vacancy-enabled charge–spin conversion. The findings emphasize the defects' contribution-, especially in oxide-based low-dimensional systems, and provide a way to create and enhance charge–spin interconversion via defect engineering.
ISSN: 1862-6254
DOI: 10.1002/pssr.202200377
Schools: School of Physical and Mathematical Sciences 
School of Electrical and Electronic Engineering 
National Institute of Education 
Rights: © 2022 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. This is the peer reviewed version of the following article: Shashank, U., Deka, A., Ye, C., et al. Room-temperature charge-to-spin conversion from quasi-2D electron gas at SrTiO₃-based interfaces. physica status solidi (RRL) – Rapid Research Letters, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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