Interfacial two-dimensional electron gas (2DEG) formed at the perovskite-type oxide, such as SrTiO3, has attracted significant attention due to its properties of ferromagnetism, superconductivity, and its potential application in oxide-based low-power consumption electronics. Recent studies have investigated spin-to-charge conversion at the STO interface with different materials, which could affect the efficiency of this 2DEG interface. In this report, we presented an Ar^+ ion milling method to create a 2DEG at STO directly by inducing oxygen vacancies. To quantify the spin-to-charge conversion of this interface, we measured the angular-dependent spin-torque ferromagnetic resonance (ST-FMR) spectra, revealing an unconventional spin polarization at the interface of Argon ion-milled STO and NiFe. Furthermore, a micromagnetic simulation for angular-dependent spin-torque ferromagnetic resonance (ST-FMR) has been performed, confirming the large unconventional spin polarization at the interface.
@article{arxiv.2307.12390,
title = {Unconventional spin polarization at Argon ion milled SrTiO3 Interfaces},
author = {Amrendra Kumar and Utkarsh Shashank and Suman Kumar Maharana and John Rex Mohan and Surbhi Gupta and Hironori Asada and Yasuhiro Fukuma and Rohit Medwal},
journal= {arXiv preprint arXiv:2307.12390},
year = {2023}
}