Spintronics at Leeds

利兹自旋电子学

• 批准号: EP/M000923/1
• 负责人: Bryan Hickey
• 金额: $ 188.1万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2014
• 资助国家: 英国
• 起止时间: 2014 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM000923%2F1
• 关键词: Spintronics; Leeds

With more than 300 papers published on the topic, the Condensed Matter group in Leeds is well known for its work on spintronics - a subject defined by the exploitation of the magnetic moment of electrons instead of charge. Recently the group has appointed two new members of staff bringing us expertise in organic spintronics (Cespedes) and nanomagnetism (Moore). Thus we are one of the first groups to develop high frequency equipment for molecular spintronics in order to research eco-friendly microwave devices. We are also exploring ways of switching magnetisation using the strain developed by an electric field - important for future storage applications. Although we have links among all members of the group, this Platform provides an excellent opportunity to take a strategic look at our activity.Our broad research strategy will concern the general theme of spintronic metamaterials. Metamaterials are artificial in that the functional properties are not a feature of the natural occurring materials that form the building blocks, but emerge through design and engineering of material combinations. The artificial aspect is often introduced through nanostructuring. An early example arises in optics where sub-wavelength features give rise to new properties such as photonic band-gap crystals. Magnetic metamaterials were at the dawn of spintronics - a multilayer composed of alternating magnetic and non-magnetic metals displays giant magnetoresistance. These properties have been exploited to great advantage in computing and communication. We aim to move from common magnetoresistive devices and spin transport physics into microwave nanodevices that manipulate the interactions between electrons with phonons, magnons and other quasiparticles in hybrid structures. Building on our recognised strengths of thin film growth, characterisation and magnetotransport we are proposing a programme of engineering materials in combinations that yield fruitful emergent properties - spintronic metamaterials. Our group has a broad background that includes the ability to structure materials at the nanoscale so that cooperative behaviour arises, e.g. combining superconductors with skyrmion spin textures, or injecting pure spin currents from magnets into organics. We will apply this capability to questions in areas identified as strategic such as quantum effects for new technology, beyond CMOS electronics, energy efficient electronics and new tools for healthcare.We shall pursue this in a way that is very different from a traditional responsive-mode research project. We have identified areas that are scientifically and nationally important and where we can make impact in both academic and technological settings. We will not specify exactly which experiments will be performed, only the type of experiment that is possible. We will use the flexibility of platform funding to develop the independence of researchers beyond that achievable in a normal grant. As an example, there is a controversy at present about the role of heat and magnetic proximity effects in spin currents and their possibilities in non-dissipative, low power consumption electronics. With platform funding we can send a researcher to visit the relevant labs and attend the workshops who would then be in a good position to recommend the best course of action. The researcher would lead those experiments with full support for necessary resources - including and encouraging, if appropriate, the contribution of PhD students and other PDRAs. This general approach can be applied across our whole platform programme to any emerging problems in the field. This is career-enhancing because researchers, at this stage of their research, can usually only gain this level of autonomy if they are independent Research Fellows. This background will fast track them for Research Fellowships or good positions in industry or top level institutions looking for individuals with initiative and vision.

利兹的凝聚态物质小组发表了300多篇关于这个主题的论文，以其在自旋电子学方面的工作而闻名-这是一个通过利用电子的磁矩而不是电荷来定义的主题。最近，该小组任命了两名新的工作人员，为我们带来了有机自旋电子学（塞斯佩德斯）和纳米磁学（摩尔）的专业知识。因此，我们是最早开发用于分子自旋电子学的高频设备的团队之一，以研究环境友好的微波器件。我们还在探索使用电场产生的应变来切换磁化的方法-这对未来的存储应用很重要。虽然我们与小组的所有成员都有联系，但这个平台提供了一个很好的机会来战略性地审视我们的活动。我们广泛的研究战略将涉及自旋电子超材料的一般主题。超材料是人造的，因为功能特性不是形成构建块的天然材料的特征，而是通过材料组合的设计和工程而出现的。人工方面通常通过纳米结构化引入。一个早期的例子出现在光学中，其中亚波长特征产生了新的特性，例如光子带隙晶体。磁性超材料是在自旋电子学的黎明-一个多层组成的交替磁性和非磁性金属显示巨磁阻。这些特性在计算和通信中得到了极大的利用。我们的目标是从普通的磁阻器件和自旋输运物理到微波纳米器件，操纵电子与声子，磁振子和其他准粒子在混合结构之间的相互作用。基于我们在薄膜生长、表征和磁输运方面公认的优势，我们提出了一项工程材料组合计划，该计划将产生富有成效的新兴特性-自旋电子超材料。我们的团队有着广泛的背景，包括在纳米尺度上构建材料的能力，从而产生合作行为，例如将超导体与skyrmion自旋纹理相结合，或将来自磁体的纯自旋电流注入有机物。我们将把这种能力应用于被确定为战略性领域的问题，例如新技术的量子效应，超越CMOS电子学，节能电子学和医疗保健的新工具。我们将以与传统响应模式研究项目截然不同的方式追求这一点。我们已经确定了科学和国家重要的领域，我们可以在学术和技术环境中产生影响。我们不会具体说明将进行哪些实验，只会说明可能的实验类型。我们将利用平台资助的灵活性，发展研究人员的独立性，超越正常资助所能实现的独立性。作为一个例子，目前有一个关于热和磁邻近效应在自旋电流中的作用及其在非耗散，低功耗电子产品中的可能性的争议。有了平台资金，我们可以派研究人员访问相关实验室并参加研讨会，然后他们将能够很好地推荐最佳行动方案。研究人员将领导这些实验，并充分支持必要的资源-包括并鼓励博士生和其他PDRA的贡献。这种通用方法可以应用于我们的整个平台计划，以解决该领域的任何新问题。这是职业生涯的增强，因为研究人员，在他们的研究的这个阶段，通常只能获得这种程度的自主权，如果他们是独立的研究员。这种背景将快速跟踪他们的研究奖学金或在行业或顶级机构寻找具有主动性和远见的个人的良好职位。

项目成果

Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers

• DOI: 10.1063/1.4977490
• 发表时间: 2016-12
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Z. Fang;A. Mitra;A. Westerman;Mannan Ali;C. Ciccarelli;O. Cespedes;B. Hickey;A. Ferguson

Emergent magnetism at transition-metal-nanocarbon interfaces

• DOI: 10.1073/pnas.1620216114
• 发表时间: 2017-05-30
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Al Ma'Mari, Fatma;Rogers, Matthew;Cespedes, Oscar
• 通讯作者: Cespedes, Oscar

Manifestation of the electromagnetic proximity effect in superconductor-ferromagnet thin film structures

• DOI: 10.1063/1.5114689
• 发表时间: 2019-08-12
• 期刊: APPLIED PHYSICS LETTERS
• 影响因子: 4
• 作者: Flokstra, M. G.;Stewart, R.;Lee, S. L.
• 通讯作者: Lee, S. L.

Spin relaxation through Kondo scattering in Cu/Py lateral spin valves

通过 Cu/Py 横向自旋阀中近藤散射的自旋弛豫

• DOI: 10.1103/physrevb.92.220420
• 发表时间: 2015
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Batley J

Unexpected magnetic properties of gas-stabilized platinum nanostructures in the tunneling regime.

• DOI: 10.1021/nl504254d
• 发表时间: 2015-01
• 期刊: Nano letters
• 影响因子: 10.8
• 作者: O. Cespedes;M. Wheeler;T. Moorsom;M. Viret