Proposal of Global Strain Clocking Scheme for Majority Logic Gate

Abstract

A stairs-type global strain clocking mechanism for nanomagnetic majority logic gate based on shape engineering of nanomagnets was designed in this paper. Reasonable size nanomagnets and proper strain clocking scheme ensure the computing architecture pipelined at room temperature. The optimal global strain clocking scheme was obtained by investigating the impact of magnetic layer thickness and width on clocking period and strain magnitude. Encouragingly, for the global strain clocking, information transmission speed of majority logic gate is increased 1-2 times as against the local strain clocking scheme due to decreasing the number of start-ups during information transmission. While the energy dissipated per clock cycle of the global strain clocking scheme consumes 3-4 times less energy than that of local strain clocking scheme. Moreover, global clocking is used to control a nanomagnetic logic device(NMLD), in which case single device consisted of many nanomagnets can be treated as single nanomagnet. However, magnetization switching is error-prone in the presence of thermal noise at room temperature. Therefore, the proper structure parameters of the device are obtained at room temperature, in which case the error probability of the majority logic gate is 0.5% in theoretical simulation. These results provide essential guidance for the design of energyefficient multiferroic nanomagnetic logic devices.INDEX TERMS Energy-efficient, global strain clocking, nanomagnetic logic device (NMLD), shape engineering, spintronics.

A nanomagnets majority logic gate based on heterogeneous multiferroic structure global strain clock

“…此后, 各 类时钟方案相继被应用于NML择多逻辑门, 其中 应变时钟多铁纳磁体择多逻辑门的研究主要有以 下进展: 2013年, Yilmaz和Mazumder [24] 提出了 一种由相同尺寸的多铁纳磁体构成的择多逻辑门, 但其模型未考虑热噪声的影响, 不能反映器件现实 工作情况. 2016年, D'Souza等 [25] 实验制备了应变 时钟驱动的多铁纳磁体互连线, 结果表明, 在室温 下, 逻辑信息可以在器件中流水线式传输, 该结果 同样为多铁纳磁体择多逻辑门提供了实验支撑, 因 为NML择多逻辑门本质上是铁磁互连线和反铁 磁互连线相交叉的传输结构. 2018年, 危波等 [23] 引入热噪声和面外磁化分量, 建立了多铁纳磁体…”