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Collaborative Research: Spin Torque Oscillators Based on Electric and Thermal Spin Currents in Self Assembled Ferromagnetic Nanowire Arrays

合作研究：自组装铁磁纳米线阵列中基于电和热自旋电流的自旋扭矩振荡器

基本信息

批准号：
1309416
负责人：
Ilya Krivorotov
金额：
$ 30万
依托单位：
University of California-Irvine
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2013
资助国家：
美国
起止时间：
2013-08-15 至 2017-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1309416&HistoricalAwards=false
关键词：
Collaborative Research Spin Torque Oscillators

项目摘要

Intellectual merit of the proposed activity: The project aims to study spin transfer torques driven by electric and thermal spin currents by utilizing ordered arrays of self-assembled ferromagnetic nanowires, and to investigate the nonlinear magnetization dynamics in these closely packed spin torque oscillator arrays. The objectives of this collaborative research are: (i)to study electric and thermal spin torques generated by a ferromagnetic nanowire in response to electric potential and temperature gradients; (ii) to study nonlinear collective magnetization dynamics in the hexagonally packed two dimensional arrays of strongly coupled spin transfer torque oscillators; and(iii)to develop a high-power microwave voltage controlled oscillator based on an array of phase locked spin torque oscillators.The proposed array of spin torque oscillators consist of hexagonally ordered cobalt nanowires electrodeposited in anodized alumina template. These nanowires will serve as spin current injectors into a thin ferromagnetic film common to all injectors. Spin currents will be generated by either voltages or thermal gradients applied across the nanowires. Coupling among the individual spin torque oscillators will be facilitated by spin waves propagating in the common ferromagnetic layer. Ultrafast electrical detection of magneto-dynamics, broadband ferromagnetic resonance and magnetic force microscopy will be used to characterize the nonlinear magnetization dynamics in the array of spin torque oscillators. The proposed research will advance the understanding of the large-amplitude magnetization dynamics driven by electric and spin currents, which is important for the development of the next generation ultrafast and non-volatile magneto-electronic devices such as hard drive read heads and wireless communication systems. This research program will also benchmark the relative strength of thermally driven spin currents against the more common spin-polarized electric currents in the same system.Broader impact of the proposed activity: The microwave voltage controlled oscillator developed in this research will have a significant technological impact on information storage and telecommunication industries. PhD students, as well as undergraduates and high school students will take part in this program under the guidance of the investigators. The practical training in nanofabrication and unique measurement techniques offered by this program will prepare specialists for the USA magneto-electronics industry that are currently undergoing a rapid transition from micro- to nano-scale. The PIs will continue to attract underrepresented students from minority-serving institutions, such as California State Universities, as well as local K-12 students to participate in the research projects. In the education curriculum, all investigators have developed courses on nanoscience and nanotechnology with a series of demonstrations for graduate and undergraduate students.This project is jointly funded by the Electronics, Photonics, and Magnetic Devices Program (EPMD) in the Division of Electrical, Communications and Cyber Systems (ECCS) and by the Electronic and Photonic Materials Program (EPM) in the Division of Materials Research (DMR).

拟议活动的智力价值：该项目旨在利用自组装铁磁纳米线的有序阵列研究由电和热自旋电流驱动的自旋转移扭矩，并研究这些紧密堆积的自旋扭矩振荡器阵列中的非线性磁化动力学。这项合作研究的目的是：（i）研究铁磁纳米线响应于电势和温度梯度产生的电和热自旋力矩;（ii）研究六角堆积的强耦合自旋转移力矩振荡器二维阵列中的非线性集体磁化动力学;（iii）研究铁磁纳米线的非线性集体磁化动力学。及（iii）发展一个高-基于锁相自旋力矩振荡器阵列的功率微波压控振荡器。所提出的自旋力矩振荡器阵列由电沉积在阳极氧化铝模板这些纳米线将作为自旋电流注入到所有注入器共有的薄铁磁膜中。自旋电流将由施加在纳米线上的电压或热梯度产生。在公共铁磁层中传播的自旋波将促进各个自旋扭矩振荡器之间的耦合。磁动力学的超快电检测、宽带铁磁共振和磁力显微镜将用于表征自旋扭矩振荡器阵列中的非线性磁化动力学。拟议的研究将推进对由电流和自旋电流驱动的大幅度磁化动力学的理解，这对于下一代超快和非易失性磁电器件（如硬盘驱动器读取头和无线通信系统）的开发非常重要。该研究计划还将对热驱动自旋电流与同一系统中更常见的自旋极化电流的相对强度进行基准测试。拟议活动的更广泛影响：本研究开发的微波压控振荡器将对信息存储和电信行业产生重大技术影响。博士生，以及本科生和高中生将在研究人员的指导下参加这个项目。该计划提供的纳米制造和独特测量技术的实践培训将为美国磁电子行业的专家做好准备，该行业目前正在经历从微米到纳米尺度的快速过渡。PI将继续吸引来自少数民族服务机构（如加州州立大学）的代表性不足的学生以及当地K-12学生参与研究项目。在教育课程中，所有研究人员都开发了纳米科学和纳米技术的课程，并为研究生和本科生提供了一系列演示。该项目由电气，通信和网络系统（ECCS）部门的电子，光子学和磁性器件计划（EPMD）和材料研究部门（DMR）的电子和光子材料计划（EPMD）共同资助。