A novel slow-down set waveform is proposed to improve the set performance and a 1 kb phase change random access memory chip fabricated with a 13nm CMOS technology is implemented to investigate the set performance by d...A novel slow-down set waveform is proposed to improve the set performance and a 1 kb phase change random access memory chip fabricated with a 13nm CMOS technology is implemented to investigate the set performance by different set programming strategies based on this new set pulse. The amplitude difference （I1 - I2） of the set pulse is proved to be a crucial parameter for set programming. We observe and analyze the cell characteristics with different I1 - I2 by means of thermal simulations and high-resolution transmission electron microscopy, which reveal that an incomplete set programming will occur when the proposed slow-down pulse is set with an improperly high I1 - I2. This will lead to an amorphous residue in the active region. We also discuss the programming method to avoid the set performance degradations.展开更多
In photomagnetic materials,changes in the molecular structure or electron distribution caused by light illumination may result in changes in magnetism,enabling regulation of the magnetic behavior of materials.Herein w...In photomagnetic materials,changes in the molecular structure or electron distribution caused by light illumination may result in changes in magnetism,enabling regulation of the magnetic behavior of materials.Herein we report a 1,8-dihydroxyanthraquinone-based hexanuclear dysprosium cluster[Dy_(6)O_(2)(L^(1))_(6)(OCH_(3))_(2)(CH_(3)OH)_(2)(DMSO)_(4)]·DMSO·CH_(3)OH(1)obtained from the solvothermal reaction of Dy(OAc)_(3)·5H_(2)O with 1,8-dihydroxyanthraquinone(H_(2)L^(1)).The six Dy_((III))ions in 1 are linked by twoμ_(4)-O,twoμ_(3)-O and tenμ_(2)-O atoms to construct a rare bicapped tetrahedral Dy_(6) skeleton.Magnetic tests showed that the cluster is a single molecule magnet(SMM)under zero field.Upon light irradiation,the terminally coordinated CH_(3)OH molecules in 1 were partly substituted by lattice DMSO molecules with the SMM performance being significantly tuned by this subtle structural variation.Single molecule magnets with such photomagnetic behavior are rarely reported.展开更多
基金Supported by the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDA09020402the National Key Basic Research Program of China under Grant Nos 2013CBA01900,2010CB934300,2011CBA00607,and 2011CB932804+2 种基金the National Integrate Circuit Research Program of China under Grant No 2009ZX02023-003the National Natural Science Foundation of China under Grant Nos 61176122,61106001,61261160500,and 61376006the Science and Technology Council of Shanghai under Grant Nos 12nm0503701,13DZ2295700,12QA1403900,and 13ZR1447200
文摘A novel slow-down set waveform is proposed to improve the set performance and a 1 kb phase change random access memory chip fabricated with a 13nm CMOS technology is implemented to investigate the set performance by different set programming strategies based on this new set pulse. The amplitude difference （I1 - I2） of the set pulse is proved to be a crucial parameter for set programming. We observe and analyze the cell characteristics with different I1 - I2 by means of thermal simulations and high-resolution transmission electron microscopy, which reveal that an incomplete set programming will occur when the proposed slow-down pulse is set with an improperly high I1 - I2. This will lead to an amorphous residue in the active region. We also discuss the programming method to avoid the set performance degradations.
基金supported by the National Natural Science Foundation of China(No.12064002,22261007 and 22361005)the Guangxi Technology Base and Talent Subject(grant no.GUIKE AD23026067).
文摘In photomagnetic materials,changes in the molecular structure or electron distribution caused by light illumination may result in changes in magnetism,enabling regulation of the magnetic behavior of materials.Herein we report a 1,8-dihydroxyanthraquinone-based hexanuclear dysprosium cluster[Dy_(6)O_(2)(L^(1))_(6)(OCH_(3))_(2)(CH_(3)OH)_(2)(DMSO)_(4)]·DMSO·CH_(3)OH(1)obtained from the solvothermal reaction of Dy(OAc)_(3)·5H_(2)O with 1,8-dihydroxyanthraquinone(H_(2)L^(1)).The six Dy_((III))ions in 1 are linked by twoμ_(4)-O,twoμ_(3)-O and tenμ_(2)-O atoms to construct a rare bicapped tetrahedral Dy_(6) skeleton.Magnetic tests showed that the cluster is a single molecule magnet(SMM)under zero field.Upon light irradiation,the terminally coordinated CH_(3)OH molecules in 1 were partly substituted by lattice DMSO molecules with the SMM performance being significantly tuned by this subtle structural variation.Single molecule magnets with such photomagnetic behavior are rarely reported.
