针对25 nm商用Flash存储器,利用中国科学院新疆理化技术研究所的60Coγ射线源和兰州重离子加速器先后进行了总剂量效应和单粒子效应实验。实验中器件先辐照30 krad(Si)的γ射线,然后再辐照不同线性能量转移(Linear Energy Transfer,LET...针对25 nm商用Flash存储器,利用中国科学院新疆理化技术研究所的60Coγ射线源和兰州重离子加速器先后进行了总剂量效应和单粒子效应实验。实验中器件先辐照30 krad(Si)的γ射线,然后再辐照不同线性能量转移(Linear Energy Transfer,LET)的重离子,得到了不同条件下Flash存储器浮栅单元错误的退火特性。实验结果表明与只进行重离子辐照相比,总剂量和重离子协同作用下器件浮栅单元错误消失的比例会发生变化,且在不同LET离子的辐照下表现出相异的趋势。分析认为辐照总剂量会引起浮栅单元电荷丢失和电荷俘获,影响浮栅单元的错误退火特性。展开更多
Cu-Ni core-shell nanowires, with an inner Cu core diameter of about 60 nm and varying Ni shell thicknesses （10, 30, 50, 60, and 80 nm）, were successfully fabricated in porous polycarbonate （PC） ion- track template...Cu-Ni core-shell nanowires, with an inner Cu core diameter of about 60 nm and varying Ni shell thicknesses （10, 30, 50, 60, and 80 nm）, were successfully fabricated in porous polycarbonate （PC） ion- track templates by a two-step etching and electrodeposition method. In our experiment, the thickness of Ni shell can be effectively tuned through the etching time of templates. The core-shell structure was confirmed by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The X-ray diffraction （XRD） pattern elucidates the co-existence of characteristic peaks for both Cu and Ni, indicating no other phases were formed during preparation. Magnetic hysteresis loops measured via vibrating sample magnetometry （VSM） revealed that Cu-Ni core-shell nanowires with thinner Ni shell exhibited obviously diamagnetic character and together with a weak ferromagnetic activity, whereas ferromagnetic behavior was primarily measured for the wires with thicker Ni shell. With increasing Ni shell thickness, the squareness and coercivity value became smaller due to the shape anisotropy and the formation of multi-domain structure.展开更多
Field-programmable-gate-array(FPGA)has been wildly used in many space missions due to its high performance and reconfiguration capability[1].With the feature size continuing scaling down.
Natural space presents a complicated radiation environment containing various energetic particle types at different flux level and the flux of the particles is not constant modulating by solar activities[1]. On the ot...Natural space presents a complicated radiation environment containing various energetic particle types at different flux level and the flux of the particles is not constant modulating by solar activities[1]. On the other hand, the heavy ion flux applied in ground based single event test was commonly set at a fixed value. Refs. [2] and [3] both pointed out that the single event test result of harden device may exhibit flux dependency. It is necessary to fully study the ion flux dependency on single event effect.展开更多
Monolayer graphene exfoliated on SiO2/Si substrate and bulk HOPG were irradiated by swift heavy ions (SHIs,479 MeV 86Kr and 112Sn) and highly charged ions (HCIs, 4 MeV 86Kr19+). The different irradiation effects cause...Monolayer graphene exfoliated on SiO2/Si substrate and bulk HOPG were irradiated by swift heavy ions (SHIs,479 MeV 86Kr and 112Sn) and highly charged ions (HCIs, 4 MeV 86Kr19+). The different irradiation effects caused by these two kinds of different ions were investigated by Raman spectrometer. The similarities and differences between HCIs and SHIs impacted graphene and HOPG are presented.展开更多
Nanopores and nanochannels produced by etching heavy ion tracks are widely used in contemporary science and technology[1]. Conical and doubly-conical nanopores (channels) have attracted special interest in the past de...Nanopores and nanochannels produced by etching heavy ion tracks are widely used in contemporary science and technology[1]. Conical and doubly-conical nanopores (channels) have attracted special interest in the past decade due to their potential in modern and rapidly growing fields, including molecular sensors, logic gates, nanoactuators, and other nanofluidic devices[2;3].展开更多
PRESTAGE is a Monte Carlo simulation code which calculates proton single event effect cross sections from heavy ion test data. It can accurately predict not only single event upsets induced by proton indirect ionizati...PRESTAGE is a Monte Carlo simulation code which calculates proton single event effect cross sections from heavy ion test data. It can accurately predict not only single event upsets induced by proton indirect ionization,but also single event latch-ups and proton direct ionization effects[1]. However, in practical applications some of the input parameters are difficult to obtain. For instance, the thickness of the sensitive volume is closely related to the topology, doping concentration, and other device parameters. Device suppliers are generally reluctant to disclose such information due to the consideration of intellectual property protection. Therefore, examining the sensitivity to the input parameters is important to the usage of the PRESTAGE method.展开更多
Space radiation environments in which satellites and spacecraft are flying contain a large amount of high-energy protons. These protons could induce single event effects in semi-conductor devices and severely destroy ...Space radiation environments in which satellites and spacecraft are flying contain a large amount of high-energy protons. These protons could induce single event effects in semi-conductor devices and severely destroy the operational reliability of the device. Therefore, estimating proton single event effect cross-sections and calculating error rates in space for the spaceflight devices are vital to the safety guarantee of the satellite in orbit[1]. Nowadays, the most commonly used theoretical methods of predicting proton single event effect cross-sections give inaccurate predictions in many circumstances[2].展开更多
文摘针对25 nm商用Flash存储器,利用中国科学院新疆理化技术研究所的60Coγ射线源和兰州重离子加速器先后进行了总剂量效应和单粒子效应实验。实验中器件先辐照30 krad(Si)的γ射线,然后再辐照不同线性能量转移(Linear Energy Transfer,LET)的重离子,得到了不同条件下Flash存储器浮栅单元错误的退火特性。实验结果表明与只进行重离子辐照相比,总剂量和重离子协同作用下器件浮栅单元错误消失的比例会发生变化,且在不同LET离子的辐照下表现出相异的趋势。分析认为辐照总剂量会引起浮栅单元电荷丢失和电荷俘获,影响浮栅单元的错误退火特性。
基金Funded by the National Natural Science Foundation of China(Nos.11175221,11179003,11005134,11375241,and 11275237)the West Light Foundation of Chinese Academy of Sciences(CAS)
文摘Cu-Ni core-shell nanowires, with an inner Cu core diameter of about 60 nm and varying Ni shell thicknesses （10, 30, 50, 60, and 80 nm）, were successfully fabricated in porous polycarbonate （PC） ion- track templates by a two-step etching and electrodeposition method. In our experiment, the thickness of Ni shell can be effectively tuned through the etching time of templates. The core-shell structure was confirmed by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The X-ray diffraction （XRD） pattern elucidates the co-existence of characteristic peaks for both Cu and Ni, indicating no other phases were formed during preparation. Magnetic hysteresis loops measured via vibrating sample magnetometry （VSM） revealed that Cu-Ni core-shell nanowires with thinner Ni shell exhibited obviously diamagnetic character and together with a weak ferromagnetic activity, whereas ferromagnetic behavior was primarily measured for the wires with thicker Ni shell. With increasing Ni shell thickness, the squareness and coercivity value became smaller due to the shape anisotropy and the formation of multi-domain structure.
基金National Natural Science Foundation of China(11690041,11805244,11675233)。
文摘Field-programmable-gate-array(FPGA)has been wildly used in many space missions due to its high performance and reconfiguration capability[1].With the feature size continuing scaling down.
文摘Natural space presents a complicated radiation environment containing various energetic particle types at different flux level and the flux of the particles is not constant modulating by solar activities[1]. On the other hand, the heavy ion flux applied in ground based single event test was commonly set at a fixed value. Refs. [2] and [3] both pointed out that the single event test result of harden device may exhibit flux dependency. It is necessary to fully study the ion flux dependency on single event effect.
文摘Monolayer graphene exfoliated on SiO2/Si substrate and bulk HOPG were irradiated by swift heavy ions (SHIs,479 MeV 86Kr and 112Sn) and highly charged ions (HCIs, 4 MeV 86Kr19+). The different irradiation effects caused by these two kinds of different ions were investigated by Raman spectrometer. The similarities and differences between HCIs and SHIs impacted graphene and HOPG are presented.
文摘Nanopores and nanochannels produced by etching heavy ion tracks are widely used in contemporary science and technology[1]. Conical and doubly-conical nanopores (channels) have attracted special interest in the past decade due to their potential in modern and rapidly growing fields, including molecular sensors, logic gates, nanoactuators, and other nanofluidic devices[2;3].
文摘PRESTAGE is a Monte Carlo simulation code which calculates proton single event effect cross sections from heavy ion test data. It can accurately predict not only single event upsets induced by proton indirect ionization,but also single event latch-ups and proton direct ionization effects[1]. However, in practical applications some of the input parameters are difficult to obtain. For instance, the thickness of the sensitive volume is closely related to the topology, doping concentration, and other device parameters. Device suppliers are generally reluctant to disclose such information due to the consideration of intellectual property protection. Therefore, examining the sensitivity to the input parameters is important to the usage of the PRESTAGE method.
文摘Space radiation environments in which satellites and spacecraft are flying contain a large amount of high-energy protons. These protons could induce single event effects in semi-conductor devices and severely destroy the operational reliability of the device. Therefore, estimating proton single event effect cross-sections and calculating error rates in space for the spaceflight devices are vital to the safety guarantee of the satellite in orbit[1]. Nowadays, the most commonly used theoretical methods of predicting proton single event effect cross-sections give inaccurate predictions in many circumstances[2].
