悬浮超导LaAlO$_3$/SrTiO$_3$微米膜上的磁接触
Magnetic contacts on freestanding superconducting LaAlO$_3$/SrTiO$_3$ micromembranes
- Technical University of Denmark（丹麦技术大学）
- CNR-SPIN（意大利国家研究委员会自旋物理学研究所）
- University of Copenhagen（哥本哈根大学）
- Niels Bohr Institute（尼尔斯·玻尔研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究制备了铁磁镍接触的超导LAO-STO微米膜器件，证实铁磁接触下超导性保留，镍接触磁历史可调控2DEG的有效磁场，为超导自旋电子器件提供了新平台。
AI中文摘要：
LaAlO$_3$/SrTiO$_3$（LAO-STO）界面处的超导二维电子气（2DEG）是超导自旋电子学的有前景平台，但将铁磁接触与该超导2DEG集成仍具挑战性。本研究通过侧边接触几何结构，实现了由铁磁镍接触连接的超导LAO-STO微米膜器件。低温输运测量表明，铁磁接触存在时超导性得以保留。研究显示，镍接触的磁历史会强烈影响超导态，其会在2DEG中产生可调谐的有效磁场。通过有效场模型，可从最大超导响应推断接触的磁化强度。本研究结果确立了铁磁接触LAO-STO作为未来研究自旋注入氧化物超导体的平台，并为基于复杂氧化物界面的超导自旋电子器件提供了途径。
英文摘要：
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.
