Harnessing Quantum Materials to design Antiferromagnetic Topological Textures

利用量子材料设计反铁磁拓扑纹理

• 批准号: EP/X024938/1
• 负责人: P Radaelli
• 金额: $ 26万
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FX024938%2F1
• 关键词: Harnessing; Quantum; Materials; design; Antiferromagnetic

The computing ecosystem uses 10% of the global electricity and contributes to 2% emissions (at par with aviation). Left unchecked, this demand is expected to rise rapidly to 21% by 2030. Hence, for energy sustainability, it is critical to develop computing platforms with dense, fast yet energy-efficient information storage and processing. An emerging candidate that can address these needs is spintronic memory and logic, which harnesses whirling magnetic topological textures (TTs) as dynamic information bits. In the last decade significant progress was made in developing ferromagnetic (FM) TTs. However, their practical utility has been inhibited by susceptibility to stray magnetic fields, strong internal dipolar fields, slow speeds and sideway motion. To alleviate these issues, there has been a surge of interest in discovering antiferromagnetic (AFM) analogues, which are predicted to be robust, scalable, ultra-fast and energy-efficient. We have recently made the pioneering demonstration of a family of AFM TTs at room temperature. To harness them practically, it is now crucial to develop targeted electrical control pathways. To this effect, HQ-AFM will build a novel quantum materials platform that affords exquisite all-electrical control of homochiral AFM TTs via emergent interfacial phenomena. First, I will design multiferroic heterostructures, containing an epitaxial AFM layer sandwiched between ferroelectric (FE) and heavy-metal (HM) layers, hosting symmetry-breaking interactions to stabilize homochiral TTs. Then, I will exploit FE switching to realize electric-field tuning of their chirality, size and stability. Lastly, I will harness current-based spin-orbit torques injected from the HM layer to trigger their nucleation and ultra-fast motion. HQ-AFM will thus enable non-volatile, reversible and scalable control of AFM TTs, pushing the knowledge frontiers of AFM topological spintronics and forging the path to energy-efficient "beyond-Moore" computing paradigm.

计算生态系统消耗了全球10%的电力，贡献了2%的排放量（与航空业相当）。如果不加以控制，到2030年，这一需求预计将迅速上升至21%。因此，为了能源的可持续性，开发具有密集、快速、节能的信息存储和处理的计算平台至关重要。一个可以满足这些需求的新兴候选是自旋电子存储器和逻辑，它利用旋转磁拓扑结构（TTs）作为动态信息位。在过去的十年中，在开发铁磁（FM） TTs方面取得了重大进展。然而，由于易受杂散磁场的影响、内部偶极磁场强、速度慢和横向运动，它们的实际应用受到了抑制。为了缓解这些问题，人们对发现反铁磁（AFM）类似物的兴趣激增，这些类似物预计将具有鲁棒性、可扩展性、超快性和高能效。我们最近在室温下进行了一系列AFM TTs的开创性演示。为了实际利用它们，现在至关重要的是开发有针对性的电控制途径。为此，HQ-AFM将建立一个新颖的量子材料平台，通过涌现的界面现象为同手性AFM TTs提供精细的全电控制。首先，我将设计多铁异质结构，包含夹在铁电（FE）和重金属（HM）层之间的外延AFM层，承载对称破断相互作用以稳定同手性TTs。然后，我将利用FE开关来实现它们的手性、尺寸和稳定性的电场调谐。最后，我将利用从HM层注入的基于电流的自旋轨道扭矩来触发它们的成核和超快速运动。因此，HQ-AFM将实现AFM TTs的非易失性、可逆和可扩展控制，推动AFM拓扑自旋电子学的知识前沿，并为节能的“超越摩尔”计算范式铺平道路。

项目成果

Spatially reconfigurable antiferromagnetic states in topologically rich free-standing nanomembranes

• DOI: 10.1038/s41563-024-01806-2
• 发表时间: 2024-02
• 期刊: Nature Materials
• 影响因子: 41.2
• 作者: H. Jani;Jack Harrison;S. Hooda;S. Prakash;Proloy Nandi;Junxiong Hu;Zhiyang Zeng;Jheng-Cyuan Lin;Charles Godfrey;G. J. Omar;Tim A Butcher;Jörg Raabe;S. Finizio;A. Thean;A. Ariando;Paolo G Radaelli

Revealing emergent magnetic charge in an antiferromagnet with diamond quantum magnetometry.

• DOI: 10.1038/s41563-023-01737-4
• 发表时间: 2024-02
• 期刊: Nature materials
• 影响因子: 41.2

Holographic imaging of antiferromagnetic domains with in-situ magnetic field.

原位磁场反铁磁域的全息成像。

• DOI: 10.1364/oe.508005
• 发表时间: 2024
• 期刊: Optics express
• 影响因子: 3.8
• 作者: Harrison J