Soft x-ray studies of nanomagnetic and spintronic materials at Brookhaven National Laboratory

布鲁克海文国家实验室纳米磁性和自旋电子材料的软 X 射线研究

• 批准号: EP/H016309/1
• 负责人: Christopher Marrows
• 金额: $ 4.64万
• 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: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH016309%2F1
• 关键词: Soft; ray; studies; nanomagnetic; spintronic

The Leeds Condensed Matter Physics Group have been regular users of synchrotron radiation at the NSLS now for over six years, where the unique element-specific sensitivity to magnetism of polarized soft x-rays has made great contributions to our research in studying disorder, anisotropy and hysteresis in a variety of nanomagnetic systems. Here we request travel funding to allow us to pursue here two main avenues of research in our new two year user programme at that facility. The first is soft x-ray magnetic scattering from arrays of nanomagnets, fabricated at the Brookhaven Center for Functional Nanomaterials, which exhibit frustrated geometries: whilst the underlying physical structure is periodic, the magnetic structure will display only short range order due to the frustration. Off-specular magnetic scattering will allow us to characterize this disorder as a function of sample array geometry, magnetic field, and temperature, yielding complementary information to real space imaging techniques. The second area is in the study of magnetic nanoclusters, formed by gas-phase aggregation and deposited as part of a magnetic multilayer stack such as a tunnel junction. We have the capability to produce very narrow and well-controlled size distributions, so size dependences. Here we will study spin-orbit moment ratios and chemical composition, such as oxidation from surrounding tunnel barrier material, using XMCD spectroscopy. Unlike similar european facilities, synchrotron beamtime at the NSLS does not come with money to support travel to the facility. The experiments form part of our ongoing and highly successful joint programme on magnetic scattering between Leeds and ISIS. The grant request is for travel and subsistence funds only to allow a team of three people to travel to Brookhaven for five weeklong periods in order to operate the experiment 24 hours a day, as well as carry out sample fabrication at the CFN and present our results at conferences.

利兹凝聚态物理组已经在NSLS的同步辐射的常规用户现在超过六年，在那里独特的元素特定的敏感性极化软X射线的磁性作出了巨大的贡献，我们的研究在各种纳米磁性系统的无序，各向异性和滞后的研究。在这里，我们要求旅行资金，使我们能够在这里进行两个主要途径的研究，在我们新的两年用户计划在该设施。第一个是来自布鲁克海文功能纳米材料中心制造的纳米磁体阵列的软X射线磁散射，其表现出受抑的几何形状：虽然底层的物理结构是周期性的，但由于受抑，磁结构将仅显示短程有序。离镜面磁散射将使我们能够表征这种无序作为一个函数的样品阵列的几何形状，磁场和温度，产生互补的信息，真实的空间成像技术。第二个领域是磁性纳米团簇的研究，通过气相聚集形成并沉积为磁性多层堆叠的一部分，例如隧道结。我们有能力生产非常窄和控制良好的尺寸分布，所以尺寸依赖性。在这里，我们将研究自旋轨道矩比和化学成分，如周围的隧道势垒材料的氧化，使用XMCD光谱。与类似的欧洲设施不同，NSLS的同步加速器束流时间并没有资金支持前往该设施。这些实验是利兹和ISIS之间正在进行的非常成功的磁散射联合计划的一部分。赠款申请是旅费和生活费，只允许一个三人小组前往布鲁克海文为期五周的时间，以便每天24小时进行实验，以及在CFN进行样品制造并在会议上展示我们的结果。