Understanding and developing spin-based emitters for improved far-infrared radiation sources

了解和开发基于自旋的发射器以改进远红外辐射源

• 批准号: EP/S033688/1
• 负责人: Paul Nutter
• 金额: $ 68.08万
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FS033688%2F1
• 关键词: Understanding; developing; spin; based; emitters

The unique way that light interacts with magnetic/non-magnetic metal ultra-thin films with thicknesses less than 1/5000th the width of a human hair has recently been shown to offer a route to producing novel sources of radiation with wavelengths that cover a wide range stretching from the mid- to far- infrared. This emission covers the THz region that lies between the microwave and the infra-red wavelengths of the electromagnetic spectrum; a wavelength range that remains difficult to cover, but has an enormous potential for a diverse range of applications. For example, THz radiation is particularly useful for security screening of people at airports due to its non-ionising properties, as well as for looking at the spectral fingerprints of materials including explosives, drugs and dust particles. The atomic properties of interfaces are well known to be critical to the functionality of many technologically important devices, examples include spin-torque transfer magnetic random-access memory (STT-MRAM), the sensors and media used in hard disk drives and new, artificial multiferroics. This project is focused on developing much needed understanding of how the emission process from ultra-thin magnetic structures depends on the material properties. By gaining understanding of how the underlying mechanisms are responsible for the emission process we will be able to demonstrate commercially-viable emitters. More specifically, the first emitters will be realised that operate without the need for an external magnetic field, overcoming the limitation this requirement currently imposes on the active emitting area and output energy. THz radiation also provides a currently untapped approach to investigating spin-based devices. The knowledge gained in understanding the relationship between material properties and THz emission will prove invaluable in the design of spintronic devices being developed for the next generation of data storage devices. The overall goal is the development of sources of THz radiation that will have impact in a number of future application areas, in particular when looking at the spectral fingerprints of materials for detecting dangerous gases and dust particles which present serious health and safety concerns in areas such as the mining industry. Hence, the development of well-understood spin-based emitters would have a direct impact on UK economic success by enabling the development of new applications of THz radiation and spin-based devices that will add to the technological advancement of society.

光与厚度小于人类头发宽度的1/5000的磁性/非磁性金属超薄膜相互作用的独特方式最近已被证明提供了产生具有覆盖从中红外延伸到远红外的宽范围的波长的新型辐射源的途径。这种发射覆盖了位于电磁波谱的微波和红外波长之间的THz区域;这一波长范围仍然难以覆盖，但具有巨大的应用潜力。例如，太赫兹辐射由于其非电离特性而特别适用于机场人员的安全检查，以及用于查看包括爆炸物，毒品和尘埃颗粒在内的材料的光谱指纹。 众所周知，界面的原子性质对许多技术上重要的设备的功能至关重要，例如自旋扭矩转移磁性随机存取存储器（STT-MRAM），硬盘驱动器中使用的传感器和介质以及新的人工多铁性。该项目的重点是发展急需的理解如何从超薄磁性结构的发射过程取决于材料的属性。通过了解潜在的机制是如何负责排放过程，我们将能够证明商业上可行的发射器。更具体地，第一发射器将被实现为在不需要外部磁场的情况下操作，克服了该要求当前强加在有效发射面积和输出能量上的限制。太赫兹辐射还提供了一种目前尚未开发的方法来研究基于自旋的设备。在理解材料性质和太赫兹发射之间的关系所获得的知识将被证明是无价的自旋电子器件的设计正在开发的下一代数据存储设备。总体目标是开发将在未来许多应用领域产生影响的THz辐射源，特别是在研究用于检测危险气体和尘埃颗粒的材料的光谱指纹时，这些气体和尘埃颗粒在采矿业等领域存在严重的健康和安全问题。因此，人们熟知的基于自旋的发射器的开发将对英国的经济成功产生直接影响，因为它能够开发太赫兹辐射和基于自旋的设备的新应用，从而促进社会的技术进步。

项目成果

Spintronic terahertz emitters exploiting uniaxial magnetic anisotropy for field-free emission and polarization control

利用单轴磁各向异性进行无场发射和偏振控制的自旋电子太赫兹发射器

• DOI: 10.1063/5.0087282
• 发表时间: 2022
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Hewett S

Spintronic terahertz emitters: Status and prospects from a materials perspective

• DOI: 10.1063/5.0057511
• 发表时间: 2021-09-01
• 期刊: APL MATERIALS
• 影响因子: 6.1
• 作者: Bull, Charlotte;Hewett, Simmone M.;Nutter, Paul W.
• 通讯作者: Nutter, Paul W.

Tunable multi-cycle terahertz pulse generation from a spintronic emitter

• DOI: 10.1063/5.0176314
• 发表时间: 2023-11-20
• 期刊: APPLIED PHYSICS LETTERS
• 影响因子: 4
• 作者: Ji，R.;Hibberd，M. T.;Graham，D. M.
• 通讯作者: Graham，D. M.