SHF: Small: Collaborative Research: Energy Efficient Strain Assisted Spin Transfer Torque Memory

SHF：小型：合作研究：节能应变辅助自旋转移扭矩存储器

基本信息

批准号：
1815033
负责人：
Jayasimha Atulasimha
金额：
$ 36万
依托单位：
Virginia Commonwealth University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-10-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1815033&HistoricalAwards=false
关键词：
SHF Small Collaborative Research Energy

项目摘要

Non-volatile random access memory (NV-RAM) is often built with a device called spin transfer torque random access memory (STT-RAM), the main constituent of which is a circular nano-magnet. A bit is "written" into the nano-magnet by passing a spin-polarized current whose polarity determines whether bit "1" or bit "0" is written. The energy barrier between these states prevents the magnetization from switching spontaneously due to thermal noise, making the device non-volatile. Unfortunately, the energy dissipated in the writing current is 100-1000 times more than the energy dissipated in today's CMOS devices, which is a large cost to pay for non-volatility. This project seeks to demonstrate that temporarily reducing the energy barrier between the "up" and "down" magnetization states with surface acoustic waves (SAW) can significantly lower the current needed to write a bit and reduce the energy dissipation by orders of magnitude. This would make the SAW-assisted STT-RAM ideal for embedded processors, internet of things, large data centers and cyber-physical systems requiring low energy memory. At least 3 PhD students would be trained on the techniques of complementary nano-fabrication, nano-characterization and computer modeling. The investigators will hold a nano-magnetism workshop for high school students and will host under-represented K-12 students in their labs for a summer month, as well as leverage the "Nano-Days" program to reach out to high school students. The key technical approach in this research project will involve the following complementary experimental and modeling research directions: (i) Modeling the combined effect of strain and spin transfer torque (STT) on the magnetization switching in the presence of thermal noise (ii) Experimental demonstration of strain induced reduction in STT write current in optimized devices (guided by the modeling effort) (iii) Proof-of-concept demonstration of acoustic wave induced reduction in STT write current. The knowledge generated by this research would lead to better understanding of the combined effect of strain and spin torque on switching nano-magnetic memory elements and the switching probability in the presence of thermal noise. If successful, it would demonstrate a low energy paradigm for writing information in non-volatile nano-magnetic memory devices.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.

非易失性随机存取存储器（NV-RAM）通常由一种称为自旋转移矩随机存取存储器（STT-RAM）的设备构建，其主要成分是圆形纳米磁体。通过传递自旋极化电流将位“写入”纳米磁体，自旋极化电流的极性决定写入位“1”还是位“0”。这些状态之间的能量势垒可防止磁化强度因热噪声而自发切换，从而使器件具有非易失性。不幸的是，写入电流中消耗的能量是当今CMOS器件中消耗的能量的100-1000倍，这是为非易失性付出的巨大成本。该项目旨在证明，利用表面声波 (SAW) 暂时降低“上”和“下”磁化状态之间的能垒可以显着降低写入一点所需的电流，并将能量耗散减少几个数量级。这将使 SAW 辅助的 STT-RAM 成为需要低能耗内存的嵌入式处理器、物联网、大型数据中心和网络物理系统的理想选择。至少 3 名博士生将接受补充纳米制造、纳米表征和计算机建模技术的培训。研究人员将为高中生举办纳米磁性研讨会，并将在夏季的一个月里在实验室接待代表性不足的 K-12 学生，并利用“纳米日”计划来接触高中生。该研究项目的关键技术方法将涉及以下互补的实验和建模研究方向：（i）模拟热噪声存在下应变和自旋转移矩（STT）对磁化翻转的综合影响（ii）实验演示优化器件中应变引起的 STT 写入电流减少（由建模工作指导） (iii) 声波引起的 STT 写入电流减少的概念验证演示。这项研究产生的知识将有助于更好地理解应变和自旋扭矩对纳米磁存储元件开关的综合影响以及热噪声存在下的开关概率。如果成功，它将展示一种在非易失性纳米磁性存储设备中写入信息的低能耗范例。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（13）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Quantum control of spin qubits using nanomagnets

DOI：
10.1038/s42005-022-01041-8
发表时间：
2022-03
期刊：
Communications Physics
影响因子：
5.5
作者：
Mohamad Niknam;M. F. Chowdhury;M. Rajib;W. A. Misba;R. Schwartz;Kang L. Wang;J. Atulasimha;L. Bouc
通讯作者：
Mohamad Niknam;M. F. Chowdhury;M. Rajib;W. A. Misba;R. Schwartz;Kang L. Wang;J. Atulasimha;L. Bouc

Hybrid Magnetodynamical Modes in a Single Magnetostrictive Nanomagnet on a Piezoelectric Substrate Arising from Magnetoelastic Modulation of Precessional Dynamics