Spin torque oscillator based on magnetic tunnel junction with MgO cap layer for radio-frequency-oriented neuromorphic computing  

作　　者：涂华垚 雒雁翔 曾柯心 吴宇轩 张黎可 张宝顺 曾中明 Huayao Tu;Yanxiang Luo;Kexin Zeng;Yuxuan Wu;Like Zhang;Baoshun Zhang;Zhongming Zeng(School of Nano Technology and Nano Bionics,University of Science and Technology of China,Hefei 230026,China;Nanofabrication Facility,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China;School of Electronics and Information Engineering,Wuxi University,Wuxi 214105,China;NanchangNano-Devices and Technologies Division,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Nanchang 330200,China;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China)

机构地区：[1]School of Nano Technology and Nano Bionics,University of Science and Technology of China,Hefei 230026,China [2]Nanofabrication Facility,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China [3]School of Electronics and Information Engineering,Wuxi University,Wuxi 214105,China [4]Nanchang(SINANONC)Nano-Devices and Technologies Division,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Nanchang 330200,China [5]Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China

出　　处：《Chinese Physics B》2023年第10期656-659,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11974379 and 12204357);K.C.Wong Education Foundation(Grant No.GJTD2019-14);Jiangxi Province“Double Thousand Plan”(Grant No.S2019CQKJ2638);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.22KB140017);Wuxi University Research Start-up Fund for Introduced Talents(Grant No.2022r006)。

摘　　要：Recently,it has been proposed that spin torque oscillators(STOs)and spin torque diodes could be used as artificial neurons and synapses to directly process microwave signals,which could lower latency and power consumption greatly.However,one critical challenge is to make the microwave emission frequency of the STO stay constant with a varying input current.In this work,we study the microwave emission characteristics of STOs based on magnetic tunnel junction with MgO cap layer.By applying a small magnetic field,we realize the invariability of the microwave emission frequency of the STO,making it qualified to act as artificial neuron.Furthermore,we have simulated an artificial neural network using STO neuron to recognize the handwritten digits in the Mixed National Institute of Standards and Technology database,and obtained a high accuracy of 92.28%.Our work paves the way for the development of radio-frequency-oriented neuromorphic computing systems.

关 键 词：spin torque oscillators artificial neuron neuromorphic computing magnetic tunnel junctions 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] TN752[自动化与计算机技术—控制科学与工程] O469[电子电信—电路与系统]