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Reliable control of magnetic vortex chirality in asymmetrically optimized magnetic nanodisk
Zhang Huanhuan,Yu Hai,Zhang Xue-Feng,Yang Xiao-Xue,Shim Je-Ho,Ma Xiao-Ping,Piao Hong-Guang 한국물리학회 2022 Current Applied Physics Vol.43 No.-
Magnetic vortex has attracted attention in the field of information storage because their topological spin structures with chiral bistable states. If the vortex core polarity and vortex circulation sense can be controlled simultaneously in a nanodisk, which will be more beneficial to realize the multi-bit ultrahigh density storage. In this paper, a reliable control scheme for magnetic vortex chirality is proposed by optimizing the structure of Pac- Man-like nanodisk. The results show that the polarity and circulation of the vortex can be controlled simultaneously by changing the direction of the global magnetic field, and even the chiral states of the vortex can be determined by detecting the stray field distribution on the surface of the nanodisk. The optimized Pac-Man-like nanodisk provide an experimental method for the control and detection of magnetic vortex chirality, which will be beneficial to the realization of multi-bit magnetic storage or magnetic logic technology in the future.
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Cuihua Xin,Ruikun Hou,Fei Wu,Yibo Zhao,Huanhuan Xiao,Wantong Si,Md Emran Ali,Lu Cai,Jiangbo Guo 한국식물학회 2015 Journal of Plant Biology Vol.58 No.6
China is the leading producer of potatoes (Solanum tuberosum) in the world. However, low-temperature stress can severely restrict the yield and quality of potato crops in that country. We used methylation-sensitive amplified polymorphisms (MSAPs) to analyze how such stress might alter the status of cytosine methylation in potato cultivar ‘Atlantic’. Over 2400 loci were identified and assessed for DNA methylation in chilling-treated and control plants. The level of cytosine methylation increased from 37.71% to 56.51% after 48 h of treatment but then decreased to 42.14% after 60 h of chilling. Stress-induced changes in the banding patterns of DNA methylation primarily resulted from full methylation of CG (internal cytosine of 5’-CCGG-3’) on double DNA strands. We sequenced 78 polymorphic DNA fragments and blasted them against NCBI. Expression patterns of 4 genes were then assessed via semi-quantitative RT-PCR. The expression patterns of genes related to chilling stress appeared to be regulated by the methylation or demethylation status in potato.
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