Magnetic contacts on freestanding superconducting LaAlO3/SrTiO3 micromembranes
Abstract
The superconducting two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 (LAO-STO) interface is a promising platform for superconducting spintronics, however, integrating ferromagnetic contacts with the superconducting 2DEG remains challenging. Here, we realize superconducting LAO-STO micromembrane devices contacted by ferromagnetic nickel contacts through a side-contact geometry. Low-temperature transport measurements demonstrate that superconductivity is preserved in the presence of the ferromagnetic contacts. We show that the superconducting state is strongly influenced by the magnetic history of the nickel contacts, which generates a tunable effective magnetic field in the 2DEG. Through an effective field model, the magnetization of the contacts can be inferred from the maximum superconducting response. Our results establish ferromagnetically contacted LAO-STO as a platform for future investigations of spin injection into oxide superconductors and provide a route towards superconducting spintronic devices based on complex oxide interfaces.
Related
- Magnetic tunnel junctions of twisted La2/3Sr1/3MnO3 freestanding bilayers
- Exotic Pauli spinors and magnetic flux quantization in a superconducting ring
- Effect of uniform bond-charge order on longitudinal spin-susceptibility jump at a superconducting instability inside a magnetic phase
- Free Majorana fermions with superconducting quantum wires and a magnetic impurity
- Trapping magnetic flux quanta in superconducting 3D caps
BibTeX
@misc{jansen2026magnetic,
title = {{Magnetic contacts on freestanding superconducting LaAlO$_3$/SrTiO$_3$ micromembranes}},
author = {Thies Jansen and Pinelopi Konstantinopoulou and Niklas Martin and Fabio Miletto Granozio and Alessia Sambri and Rasmus Bjørk and Felix Trier and Thomas S. Jespersen},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29771},
eprint = {2608.29771},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29771},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Magnetic contacts on freestanding superconducting LaAlO_3/SrTiO_3 micromembranes
AU - Thies Jansen
AU - Pinelopi Konstantinopoulou
AU - Niklas Martin
AU - Fabio Miletto Granozio
AU - Alessia Sambri
AU - Rasmus Bjørk
AU - Felix Trier
AU - Thomas S. Jespersen
PY - 2026
DA - 2026/08/30
PB - arXiv
DO - 10.48550/arxiv.2608.29771
UR - https://arxiv.org/abs/2608.29771
AB - The superconducting two-dimensional electron gas (2DEG) at the LaAlO_3/SrTiO_3 (LAO-STO) interface is a promising platform for superconducting spintronics, however, integrating ferromagnetic contacts with the superconducting 2DEG remains challenging. Here, we realize superconducting LAO-STO micromembrane devices contacted by ferromagnetic nickel contacts through a side-contact geometry. Low-temperature transport measurements demonstrate that superconductivity is preserved in the presence of the ferromagnetic contacts. We show that the superconducting state is strongly influenced by the magnetic history of the nickel contacts, which generates a tunable effective magnetic field in the 2DEG. Through an effective field model, the magnetization of the contacts can be inferred from the maximum superconducting response. Our results establish ferromagnetically contacted LAO-STO as a platform for future investigations of spin injection into oxide superconductors and provide a route towards superconducting spintronic devices based on complex oxide interfaces.
ER -