Spin injection at MgB2-superconductor/ferromagnet interface

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-09-03 DOI:10.1063/5.0220815

C. Pfaff, S. Petit-Watelot, S. Andrieu, L. Pasquier, J. Ghanbaja, S. Mangin, K. Dumesnil, T. Hauet

引用次数: 0

Abstract

There is a growing interest in mixing spintronics and superconductivity to develop original energy-efficient nonvolatile memory and logic devices. Research works conducted so far have mostly focused on superconductor with critical temperature Tc lower than 10 K. Here, we report on the growth and characterization of MgB2/Ni80Fe20 and MgB2/Co bilayers, where Tc of the MgB2 layer is of the order of 30 K. Ferromagnetic resonance was undertaken to analyze the spin pumping into MgB2. The larger magnetization at saturation in Co, as compared to Ni80Fe20, induces a smaller spin pumping contribution to the damping when MgB2 is normal. A spin pumping reduction was observed for both bilayers when MgB2 becomes superconductor and is attributed to the opening of the superconducting gap. The present results show that MgB2 thin films could be suitable to implement superconducting spintronic at 30 K, which is not only relevant for future technological development but also relaxes experimental constraints related to low-temperature investigations.

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MgB2 超导体/铁磁体界面的自旋注入

人们对将自旋电子学与超导技术相结合以开发独创的高能效非易失性存储器和逻辑器件的兴趣与日俱增。这里，我们报告了 MgB2/Ni80Fe20 和 MgB2/Co 双层膜的生长和特性分析，其中 MgB2 层的 Tc 为 30 K。与 Ni80Fe20 相比，Co 的饱和磁化较大，因此当 MgB2 正常时，自旋泵对阻尼的贡献较小。当 MgB2 成为超导体时，在两种双层膜中都观察到了自旋泵的减少，这归因于超导间隙的打开。本研究结果表明，MgB2 薄膜可能适合在 30 K 温度下实现超导自旋电子学，这不仅与未来的技术发展相关，而且放宽了与低温研究相关的实验限制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.