Yonglong Zhu, Qun Xu
Two-dimensional magnets hold great promise for spintronic applications, and LaAlO₃/SrTiO₃ heterostructures provide an important platform for exploring emergent interfacial magnetic phenomena. A supercritical CO₂-assisted strategy was developed to fabricate 2D LaAlO₃/SrTiO₃ heterostructures, enabling the simultaneous exfoliation of nanosheets, heterostructure assembly, and amorphization of LaAlO₃. The structure, composition, and morphology were characterized by various techniques including Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS), and Raman spectroscopy, while magnetic properties were measured using a vibrating sample magnetometer at room temperature. Results indicate that CO₂ pressure plays a critical role in controlling lattice expansion, amorphization of LaAlO₃, and formation of interfacial defects, yielding a saturation magnetization that is strongly pressure-dependent, reaching 0.13 emu/g at 300 K under 14 MPa. Enhanced ferromagnetism is primarily attributed to B-site cation defects and Ti₄+ antisite defects, with oxygen vacancies becoming dominant at higher pressures. This supercritical CO₂ route represents a green, efficient, and scalable method for constructing 2D magnetic oxide heterostructures with tunable room-temperature ferromagnetism, thus promoting the development of oxide-based spintronic devices.
@article{11f681ec-9d06-4430-b030-f8ed745de68a,
title={Supercritical CO2 synthesis of LaAlO3 Sr},
author={Yonglong Zhu and Qun Xu},
year={2026},
language={en}
}TY - JOUR TI - Supercritical CO2 synthesis of LaAlO3 Sr AU - Yonglong Zhu AU - Qun Xu PY - 2026 LA - en ER -
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