4.6 Article

Focused surface acoustic wave induced nano-oscillator based reservoir computing

期刊

APPLIED PHYSICS LETTERS
卷 121, 期 10, 页码 -

出版社

AIP Publishing
DOI: 10.1063/5.0110769

关键词

-

资金

  1. National Science Foundation [CCF-1815033]
  2. Commonwealth Cyber Initiative (CCI)

向作者/读者索取更多资源

We demonstrate that a nanomagnet array excited by surface acoustic waves can serve as a reservoir with high memory effect and computing capability. The nanomagnet array has lower energy dissipation and is able to accurately predict time series with scalability and flexibility.
We demonstrate using micromagnetic simulations that a nanomagnet array excited by surface acoustic waves (SAWs) can work as a reservoir. An input nanomagnet is excited with focused SAW and coupled to several nanomagnets, seven of which serve as output nanomagnets. To evaluate memory effect and computing capability, we study the short-term memory (STM) and parity check (PC) capacities, respectively. The SAW (4 GHz carrier frequency) amplitude is modulated to provide a sequence of sine and square waves of 100 MHz frequency. The responses of the selected output nanomagnets are processed by reading the envelope of their magnetization states, which is used to train the output weights using the regression method. For classification, a random sequence of 100 square and sine wave samples is used, of which 80% are used for training, and the rest are used for testing. We achieve 100% training and 100% testing accuracy. The average STM and PC are calculated to be & SIM;4.69 and & SIM;5.39 bits, respectively, which is indicative of the proposed acoustically driven nanomagnet oscillator array being well suited for physical reservoir computing applications. The energy dissipation is & SIM;2.5 times lower than a CMOS-based echo-state network. Furthermore, the reservoir is able to accurately predict Mackey-Glass time series up to several time steps ahead. Finally, the ability to use high frequency SAW makes the nanomagnet reservoir scalable to small dimensions, and the ability to modulate the envelope at a lower frequency (100 MHz) adds flexibility to encode different signals beyond the sine/square waves classification and Mackey-Glass predication tasks demonstrated here. Published under an exclusive license by AIP Publishing.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据