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Studies of Artificial Spin Ice at Brookhaven and Lawrence Berkeley National Laboratories

布鲁克海文和劳伦斯伯克利国家实验室的人造旋转冰研究

基本信息

批准号：
EP/J021482/1
负责人：
Christopher Marrows
金额：
$ 5.9万
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：
2012
资助国家：
英国
起止时间：
2012 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FJ021482%2F1
关键词：
Studies Artificial Spin Ice Brookhaven

项目摘要

Artificial spin ices are arrays of patterned nanomagnets. They make use of nanotechnology to reproduce many of the features found in the 'naturally-occurring' spin ices--pyrochlore crystals, in which rare earth moments are arranged meeting in groups of four at tetrahedral vertices so as to enforce geometric frustration--in a two-dimensional analog. In these artificial systems, all parameters can be specified by design and the exact configuration of the moments can be inspected using high resolution magnetic microscopy. As a result they offer exciting possibilities in studying statistical mechanical models in and out of thermal equilibrium, visualising phenomena such as fractionalised monopole excitations at room temperature in a way that is impossible in the pyrochlore systems, and exploring novel applications, such as using the 'magnetricity' of these monopoles to perform neuromorphic computing. Fabricating and studying these systems requires state-of-the-art facilities. Here we seek travel support to allow us to access three unique facilities at two US National Laboratories: the Center for Functional Nanomaterials (CFN) and the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory (BNL) and the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory (LBNL), at all of which we have won facility time to study artificial spin ices through competitive peer review. We will fabricate samples at the extreme nanoscale at the CFN, and study them in reciprocal (NSLS) and real (ALS) space at the two synchrotron facilities.

人造旋转冰是有图案的纳米磁体阵列。他们利用纳米技术以二维模拟的方式再现了“天然存在”的自旋冰（烧绿石晶体）中发现的许多特征，其中稀土矩在四面体顶点处以四个为一组排列，以增强几何挫败感。在这些人工系统中，所有参数都可以通过设计指定，并且可以使用高分辨率磁显微镜检查力矩的精确配置。因此，它们为研究热平衡内外的统计力学模型、以烧绿石系统中不可能的方式可视化诸如室温下的分段单极子激发等现象以及探索新颖的应用（例如利用这些单极子的“磁力”来执行神经形态计算）提供了令人兴奋的可能性。制造和研究这些系统需要最先进的设施。在这里，我们寻求差旅支持，以便能够使用两个美国国家实验室的三个独特设施：布鲁克海文国家实验室 (BNL) 的功能纳米材料中心 (CFN) 和国家同步加速器光源 (NSLS) 以及劳伦斯伯克利国家实验室 (LBNL) 的先进光源 (ALS)，在所有这些设施中，我们通过竞争对手赢得了研究人造自旋冰的设施时间审查。我们将在 CFN 制造极端纳米尺度的样品，并在两个同步加速器设施的倒易 (NSLS) 和实 (ALS) 空间中研究它们。