Superconducting Spintronics

超导自旋电子学

• 批准号: EP/N017242/1
• 负责人: Jason Robinson
• 金额: $ 345.95万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FN017242%2F1
• 关键词: Superconducting; Spintronics

This programme will study the synergy between superconductivity and magnetism which can be engineered in certain devices and use this to demonstrate superconducting spintronics as future computing technology.In ferromagnetic metals, an internal exchange field generates an imbalance in the number of electrons with up and down spins which means that currents that emerge from ferromagnets into non-magnetic metals carry a net spin in addition to charge. Such spin polarized currents are utilized for logic and sensor applications (for example in hard disk drives), and finding ways to generate and control them is a major goal of spin electronics (spintronics). However, the heat loss from the charge currents used to generate spin currents can be considerable and this is one reason why applications of spintronics, such as integrated memory chips, are presently limited.In superconductors charge can flow without dissipation but, since the Cooper pairs consist of electrons with antiparallel spins, charge currents cannot carry spin. Further, since Cooper pairs are easily disrupted by magnetism, the coupling of superconductivity and ferromagnetism might appear useless for applications in spintronics. However, during the past few years a series of discoveries have shown that, not only can magnetism and superconductivity be made to cooperate, but in carefully engineered superconductor/magnet systems new functionality can be created in which spin, charge and superconducting phase coherence can work together. By combining these different degrees of freedom a whole new spectrum of recent predictions is waiting to be explored experimentally.Through this ambitious programme we have the chance to transform this array of predictions and discoveries about the interaction between superconductivity and magnetism into a demonstration technology which could eventually be developed as a replacement for large-scale semiconductor-based logic. Our ideas for the proposed field of superconducting spintronics go far beyond the simple ideas of eliminating resistive losses inherent in conventional spin electronic (spintronic) circuits, but instead aim to exploit unique attributes of the superconducting state to control spin currents and spin accumulation. The programme brings together teams from three different specialties - superconducting devices, high speed spintronics and theory of strong correlations in mesoscopic physics - which will work together to identify and investigate the key underpinning science. This basic science which will emerge from the programme will allow us to understand which of the many predicted effects are viable for long-term development. The flexibility of a Programme Grant will allow us to work in parallel on all the potential elements and then progressively focus on those that show most promise for demonstrator devices: firstly a memory device which can store data indefinitely but can be switched with ultra-low energy and, secondly, some form of logic device. The latter may be a transistor-like structure or one of the all-spin logic devices proposed for conventional spintronics. The ambition for these superconducting spintronic devices is that they will combine the scalability inherent in conventional spintronics and the high speed and low power offered by superconductors. The risks are such that we may not be able to realise all of these ideas but, by working in parallel on a wide range of different phenomena which couple superconductivity and spin transport, we have a unique opportunity to define a new technology field.

This programme will study the synergy between superconductivity and magnetism which can be engineered in certain devices and use this to demonstrate superconducting spintronics as future computing technology.In ferromagnetic metals, an internal exchange field generates an imbalance in the number of electrons with up and down spins which means that currents that emerge from ferromagnets into non-magnetic metals carry a net spin in addition to charge.这种自旋极化电流用于逻辑和传感器应用（例如，在硬盘驱动器中），找到生成和控制它们的方法是自旋电子（Spintronics）的主要目标。但是，用于产生自旋电流的电荷电流的热量损失可能是相当大的，这就是为什么Spintronics的应用（例如集成的存储芯片）目前受到限制。在超导体电荷中，电荷可以在没有耗散的情况下流动，但是，由于Cooper Pairs由电动旋转的电子配对组成，因此电荷电荷无法携带旋转。此外，由于库珀对很容易被磁性破坏，因此超导性和铁磁性的耦合对于Spintronics的应用似乎毫无用处。但是，在过去的几年中，一系列发现表明，不仅可以使磁性和超导性配合使用，而且在精心设计的超导体/磁铁系统中，可以创建新功能，在这种功能中，自旋，电荷和超导相相一致性可以共同起作用。通过结合这些不同的自由度，最新预测的全新频谱正在等待实验探索。通过这个雄心勃勃的程序，我们有机会将有关超导性和磁性之间相互作用的一系列预测和发现转变为一种示范技术，最终可以作为大型半阶级基于半阶级的logic替代。我们对拟议的超导旋转三位型领域的想法远远超出了消除常规旋转电子（Spintronic）电路中固有的电阻损失的简单想法，而是旨在利用超导状态的独特属性来控制旋转电流和旋转积累。该计划汇集了来自三种不同专业的团队 - 超导设备，高速旋转型和介质物理中强相关性的理论 - 它们将共同识别和研究关键的基础科学。该计划将从该计划中出现的基础科学将使我们能够了解哪些预测影响对于长期发展是可行的。程序赠款的灵活性将使我们能够在所有潜在元素上并行工作，然后逐步专注于展示演示器设备最有前途的那些元素：首先是一个可以无限期存储数据但可以用超低能量切换的内存设备，其次，其次是某种形式的逻辑设备。后者可以是类似晶体管的结构，也可以是用于常规旋转型的全旋转逻辑设备之一。这些超导旋转器设备的野心是，它们将结合常规旋转型固有的可扩展性以及超导体提供的高速和低功率。风险使我们可能无法意识到所有这些想法，但是，通过在各种不同的现象中并行工作，这些现象将超导性和旋转运输融为一体，我们有一个独特的机会来定义新的技术领域。

项目成果

A Review of Electronic Transport in Superconducting Sr2RuO4 Junctions

• DOI: 10.3390/coatings11091110
• 发表时间: 2021-09
• 期刊: Coatings
• 影响因子: 3.4
• 作者: M. Anwar;J. Robinson

Magnetic Skyrmion Lattice by Fourier Transform Method

傅立叶变换法磁斯格明子晶格

• DOI: 10.48550/arxiv.1901.02459
• 发表时间: 2019
• 作者: Balkind E

Anomalous anisotropic behaviour of spin-triplet proximity effect in Au/SrRuO3/Sr2RuO4 junctions.

Au/SrRuO3/Sr2RuO4 结中自旋三重态邻近效应的异常各向异性行为。

• DOI: 10.17863/cam.44832
• 发表时间: 2019
• 作者: Anwar M

Radio-Frequency Capacitive Gate-Based Sensing

• DOI: 10.1103/physrevapplied.10.014018
• 发表时间: 2018-07-19
• 期刊: PHYSICAL REVIEW APPLIED
• 影响因子: 4.6
• 作者: Ahmed, Imtiaz;Haigh, James A.;Gonzalez-Zalba, M. Fernando
• 通讯作者: Gonzalez-Zalba, M. Fernando

Magnetic skyrmion lattice by the Fourier transform method

• DOI: 10.1103/physrevb.99.134446
• 发表时间: 2019-04-30
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Balkind, Eugene;Isidori, Aldo;Eschrig, Matthias
• 通讯作者: Eschrig, Matthias