DataVXphysica status solidi (RRL) – Rapid Research LettersPaper
journal article·2023-06

Room‐Temperature Charge‐to‐Spin Conversion from Quasi‐2D Electron Gas at SrTiO3‐Based Interfaces

Utkarsh Shashank, Angshuman Deka, Chen Ye, Surbhi Gupta, Rohit Medwal, Rajdeep Singh Rawat, Hironori Asada, X. Renshaw Wang, Yasuhiro Fukuma

physica status solidi (RRL) – Rapid Research Letters· Volume 17· Issue 6
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Source abstract

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.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Information Technology Faculty of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka 820-8502 Japan

Birck Nanotechnology Center School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907 USA

School of Physical and Mathematical Sciences Nanyang Technological University 637616 Singapore

Natural Sciences and Science Education National Institute of Education Nanyang Technological University 637616 Singapore

Department of Physics Indian Institute of Technology Kanpur Kanpur 208016 India

Graduate School of Sciences and Technology for Innovation Yamaguchi University 2-16-1 Tokiwadai Ube 755-8611 Japan

School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore

Research Center for Neuromorphic AI hardware Kyushu Institute of Technology Kitakyushu 808-0196 Japan

Funding

Japan Society for the Promotion of Science · Iketani Science and Technology Foundation · National Research Foundation Singapore · Ministry of Education - Singapore

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