Terahertz Spin‐to‐Charge Conversion in Strontium Iridate‐Based Magnetic Heterostructures
Abstract
AbstractOxide interfaces have enormous potential for future electronics with many applications, such as large spin Hall conductance, phase transitions, topological states, and superconductivity. However, previous investigations have predominantly focused on gigahertz frequencies; whilst the possibilities to fabricate devices operational at terahertz frequencies are demonstrated. A model solution is proposed employing 5d rare‐earth, strontium iridate (SrIrO3) heterostructure with cobalt (Co) ultrathin layers. Femtosecond lasers are used to photoexcite the spins in Co, which super diffuse into the SrIrO3 layer to produce an ultrafast inverse spin Hall effect in sub‐picosecond timescales. The devices exploit the external magnetic field and laser fluence to control the spin polarization from the Co layer and demonstrate a tailored spin Hall effect. These results thus pave paths for next‐generation ultrafast oxide electronics offering possibilities for room temperature‐based devices.
Article Details
Authors (16)
Ali Abdelaziem
Ziqi Li
Ganesh Ji Omar
Department of Physics Faculty of Science National University of Singapore 2 Science Drive 3, Blk S12 Singapore 117551 Singapore
Lisen Huang
Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis 08‐03 Singapore 138634 Singapore
Piyush Agarwal
Institute of Materials Research and Engineering, Agency for Science, Technology and Research 2 , Fusionopolis Way 2, Singapore 138634,
Yao Wu
School of Materials Science & Engineering
Hong Yan
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry
Lim Chee Beng
Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis 08‐03 Singapore 138634 Singapore
Hui Kim Hui
Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way, Innovis 08‐03 Singapore 138634 Singapore
Abdullah I. El‐Kholy
National Institute of Laser Enhanced Sciences (NILES) Cairo University Giza 12613 Egypt
Bijun Tang
School of Materials Science and Engineering
Teddy Salim
Ariando Ariando
Department of Physics, National University of Singapore 2 , Singapore 117542,
Zheng Liu
Elbert E. M. Chia
Ke Lin