Voltage-based switching of memory elements based-on spin dephasing, diffusion and switching in ferrimagnetic metals

基于亚铁磁金属自旋相移、扩散和切换的存储元件电压切换

• 批准号: 2116991
• 负责人: Barry Zink
• 金额: $ 35.99万
• 依托单位: University of Denver
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2116991&HistoricalAwards=false
• 关键词: Voltage; based; switching; memory; elements

Our economy and society rely heavily on information technology, which consumes an ever-growing amount of energy to process and store the world’s information. This makes energy-efficient, non-volatile memory systems a critical goal for future computers. Magnets, where information is encoded in bits typically formed from ferromagnetic materials with “north” and “south” poles with very much reduced size, currently store a huge amount of information. However, these memory systems rely on magnetic fields to manipulate the poles, giving a technology with non-volatile storage but limited size and energy efficiency. This project aims to achieve a low-current, based on materials with properties of antiferromagnets and ferromagnets, called a ferrimagnet by using all electrical means of manipulating nanoscale non-volatile magnetic memory. A ferrimagnet has vanishing magnetization at a certain temperature which can be shifted with carefully engineered applied electric field. This project will provide fundamental scientific knowledge and demonstration of this principle, for the fabrication of energy efficient, non-volatile, nanoscale magnetic memory and switching devices. The project will involve graduate and undergraduate students training and outreach activities involving collaboration with the student physics club, online spintronics seminar series and brown bag seminars. This project focuses on ferrimagnetic metal alloys and bilayers, with the overall goal of demonstrating voltage-based switching of memory elements using a detection scheme based on the anomalous Hall effect, and of spin transport sensors such as non-local spin valves. One specific focus is on a design of a new experiment to measure both the spin dephasing length and the spin diffusion length in ferrimagnetic metals. These measurements for a single material, will provide critical information for a range of spintronic systems and devices. The project will also explore voltage manipulation via electrolytic gating using an ionic gel. The project explores temperature-driven switching of the ferrimagnet as a first step toward eventual voltage-gated switching, which could also prove useful for applications in sensing. Research activities will involve characterization and development of ferrimagnetic metals, including SQUID magnetometry and thermoelectric and thermal conductivity measurements using unique micro- and nanomachined measurement tools. The project has four main thrusts: (1) Developing, optimizing, and characterizing materials for ferrimagnetic spintronics, (2) Measuring the spin dephasing and diffusion lengths in ferrimagnetic metals, (3) Using a ferrimagnet to Realize Voltage-Driven Deterministic Magnetic Switching, and 4) Tuning spin direction in a ferrimagnetic non local spin valve.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

我们的经济和社会在很大程度上依赖信息技术，该信息技术消耗了不断增长的能量来处理和存储世界的信息。这使节能，非易失性存储系统成为未来计算机的关键目标。磁铁，在其中编码的位置通常是由具有“北”和“南方”杆的铁磁材料形成的，尺寸大大降低，目前存储了大量信息。但是，这些记忆系统依靠磁场来操纵两极，从而提供了具有非挥发性存储但尺寸和能源效率有限的技术。该项目的目的是基于具有抗铁磁铁和铁磁体的特性的材料，通过使用所有电气手段来操纵纳米级非挥发性磁性记忆。 Ferrimagnet在一定温度下消失了磁化，可以通过精心设计的施加电场进行移动。该项目将为该原理提供基本的科学知识和演示，以制造能节能，非挥发性，纳米级磁性记忆和开关设备。该项目将涉及研究生和本科生培训和外展活动，涉及与学生物理俱乐部，在线Spintronics开创性系列和棕色袋中的合作。该项目的重点是铁磁性金属合金和双层，其总体目标是使用基于异常霍尔效应的检测方案以及基于异常的传输传感器（例如非局部自旋阀）来证明基于电压的存储元件开关。一个特定的重点是设计新实验的设计，以测量旋转长度的长度和铁磁金属中的自旋扩散长度。这些对单个材料的测量将为各种自旋系统和设备提供关键信息。该项目还将使用离子凝胶通过电解门探测电压操纵。该项目探索了由温度驱动的Ferrimagnet的切换，这是朝着事件电压门控开关迈出的第一步，这也可能证明对感应中的应用程序有用。研究活动将涉及铁磁金属的表征和开发，包括使用独特的微机和纳米机械测量工具，包括鱿鱼磁力测定法以及热电和热导率测量。该项目具有四个主要的推力：（1）开发，优化和表征用于铁磁性旋转的材料，（2）测量铁磁金属中的自旋倾向和扩散长度，（3）使用费里马格使用铁磁体来实现电压驱动的驱动式磁性磁性转换，以及4）调节的旋转式，4）法定使命，并使用基金会的知识分子优点和更广泛的影响标准通过评估被认为是宝贵的支持。