Materials World Network: A Study of Spin Dynamics in Fe/CoO/MgO(001) and Fe/NiO/MgO(001) Using Time-Resolved and Element-Specific XMCD and XMLD

材料世界网络：使用时间分辨和元素特定的 XMCD 和 XMLD 研究 Fe/CoO/MgO(001) 和 Fe/NiO/MgO(001) 中的自旋动力学

• 批准号: 1210167
• 负责人: Zi Qiu
• 金额: $ 39万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1210167&HistoricalAwards=false
• 关键词: Materials; World; Network; Study; Spin

Technical Abstract: This Materials World Network collaboration will develop a research program to perform time-resolved and element-specific measurement on spin dynamics in magnetic nanostructures at the Advanced Light Source (ALS) of Lawrence Berkeley National Laboratory. Ferromagnetic/Antiferromagnetic (FM/AFM) Py/CoO and Py/NiO bilayers will be grown on MgO(001) substrate by Molecular Beam Epitaxy (MBE) and 2 or 4GHz microwaves will be delivered to the sample through coplanar waveguide sample design to generate ferromagnetic resonance (FMR) of the Py layer. By synchronizing the microwave source with the ALS accelerator frequency, the research team will perform time-resolved and element-specific X-ray Magnetic Circular Dichroism (XMCD) on the Py spin dynamics and X-ray Magnetic Linear Dichroism (XMLD) on the CoO or NiO spin dynamics. The research will involve a close collaboration by exchanging students between UC-Berkeley at US and Exeter Univ. at UK, as well as critical technical information between ALS in US and Diamond Source in UK. Non-Technical Abstract: As magnetic devices perform faster and faster, spin dynamics becomes more and more important in nanostructures. In particular, nanosecond or GHz range sets a critical time scale beyond which spin procession starts domination domain wall motion in spin switching. This Materials World Network collaborative research program will develop a basic understanding of the spin dynamics right in the GHz range in FM/AFM nanostructures. In order to achieve this goal, collaborative effort is needed among US, UK, and Synchrotron expertise. Results of the research will lead to an understanding of the spin dynamics in the important ns time range to provide guidance for future spintronics devices. Graduate students will receive training at the cutting edge of modern experimental techniques through exchange program, which is crucial for their future careers in academic, industrial, and government jobs.This project is supported by the Condensed Matter Physics Program and the Office of Special Programs in the Division of Materials Research.

技术摘要：该材料世界网络合作将开发一个研究计划，在劳伦斯伯克利国家实验室的先进光源（ALS）对磁性纳米结构中的自旋动力学进行时间分辨和特定元素的测量。利用分子束外延（MBE）技术在MgO（001）衬底上生长铁磁/反铁磁（FM/AFM）Py/CoO和Py/NiO双层膜，并通过共面波导样品设计将2或4GHz微波传输到样品中，使Py层产生铁磁共振（FMR）。通过将微波源与ALS加速器频率同步，研究小组将对Py自旋动力学进行时间分辨和元素特定的X射线磁性圆二色性（XMCD），并对CoO或NiO自旋动力学进行X射线磁性线性二色性（XMLD）。该研究将涉及美国加州大学伯克利分校和英国埃克塞特大学之间交换学生的密切合作，以及美国ALS和英国Diamond Source之间的关键技术信息。非技术摘要：随着磁性器件的性能越来越快，自旋动力学在纳米结构中变得越来越重要。特别地，纳秒或GHz范围设置了一个临界时间尺度，超过该时间尺度，自旋过程开始自旋切换中的支配畴壁运动。 该材料世界网络合作研究计划将在FM/AFM纳米结构的GHz范围内对自旋动力学进行基本了解。为了实现这一目标，需要美国、英国和Synchrotron专业人员之间的合作。研究结果将有助于理解重要的ns时间范围内的自旋动力学，为未来的自旋电子学器件提供指导。研究生将通过交流项目接受现代实验技术前沿的培训，这对他们未来的学术，工业和政府工作至关重要。该项目由凝聚态物理计划和材料研究部特别计划办公室支持。