Recent theory and experiments show that artificial magnetic skyrmions can be stabilized at room temperature without the need for the external magnetic field,casting strong potentials for the device applications.In thi...Recent theory and experiments show that artificial magnetic skyrmions can be stabilized at room temperature without the need for the external magnetic field,casting strong potentials for the device applications.In this work,we study the electric field manipulation of artificial magnetic skyrmions imprinted by Co disks on CoPt multilayers utilizing the micromagnetic simulations.We find that the reversible annihilation and creation of skyrmions can be realized with the electric field via the strain mediated magnetoelastic coupling.In addition,we also demonstrate controllable manipulation of individual skyrmion,which opens a new platform for constructing magnetic field-free and low-energy dissipation skyrmion based media.展开更多
Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in g...Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in geometrically confined systems are crucial for the development of skyrmion-based spintronic devices. In this study, we focus on investigating the non-reciprocal transport behavior of skyrmions and their interactions with boundaries of various shapes. The shape of the notch structure in the nanotrack significantly affects the dynamic behavior of magnetic skyrmions. Through micromagnetic simulation, the non-reciprocal transport properties of skyrmions in nanowires with different notch structures are investigated in this work.展开更多
利用溶剂热法制备纳米Fe 3 O 4,并将其分散在正硅酸乙酯(TEOS)水解液中,在表面沉积一层SiO_(2).用甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)对SiO_(2)-Fe 3 O 4表面改性,得到MPS-SiO_(2)-Fe 3 O 4.将甲基丙烯酸(MAA)与己烯雌酚(DES)以摩尔比...利用溶剂热法制备纳米Fe 3 O 4,并将其分散在正硅酸乙酯(TEOS)水解液中,在表面沉积一层SiO_(2).用甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)对SiO_(2)-Fe 3 O 4表面改性,得到MPS-SiO_(2)-Fe 3 O 4.将甲基丙烯酸(MAA)与己烯雌酚(DES)以摩尔比4∶1加入乙腈溶剂中,进行12 h自组装,再加入MPS-SiO_(2)-Fe 3 O 4、乙二醇二甲基丙烯酸酯(EGDMA)和偶氮二异丁腈(AIBN),进行超声分散30 min,65℃条件下机械搅拌,反应24 h,制得DES磁性分子印迹聚合物(MMIP).采用透射电镜、振动样品磁强计和吸附试验等方法进行表征分析.结果表明:MMIP的饱和磁化强度为268 kA/m,无磁滞现象,矫顽力为0,表现出超顺磁性,在磁铁作用下17 s就可与溶液分离;室温下,MMIP对DES的静态最大吸附量为7.1 mg/g,动态吸附时MMIP在60 min时可以达到静态最大吸附量的90%以上;MMIP对DES的印迹因子为3.70,因而对DES有较大的识别能力;MMIP可重复使用6次以上,具有良好的再生循环性能.展开更多
基金Project supported by the National Key R&D Program of China(Grant Nos.2021YFB3502400 and 2022YFA1403601)the National Natural Science Foundation of China(Grant Nos.12274204,12274203,51831005,52172270,11974165,92165103,51971110,12004329,and 12241402).
文摘Recent theory and experiments show that artificial magnetic skyrmions can be stabilized at room temperature without the need for the external magnetic field,casting strong potentials for the device applications.In this work,we study the electric field manipulation of artificial magnetic skyrmions imprinted by Co disks on CoPt multilayers utilizing the micromagnetic simulations.We find that the reversible annihilation and creation of skyrmions can be realized with the electric field via the strain mediated magnetoelastic coupling.In addition,we also demonstrate controllable manipulation of individual skyrmion,which opens a new platform for constructing magnetic field-free and low-energy dissipation skyrmion based media.
基金Project supported by the Key-Area Research and Development Program of Guangdong Province,China(Grant No.2021B0101300003)the Guangdong Basic and Applied Basic Research Foundation,China(Grant Nos.2022A1515110863 and 2023A1515010837)+5 种基金the National Key Research and Development Program of China(Grant No.2016YFA0300803)the National Natural Science Foundation of China(Grant Nos.12304136,61427812,11774160,12241403,51771127,52171188,and 52111530143)the Natural Science Foundation of Jiangsu Province,China(Grant Nos.BK20192006 and BK20200307)the Fundamental Research Funds for the Central Universities,China(Grant No.021014380113)International Exchanges 2020 Cost Share(NSFC),China(Grant No.IECNSFC201296)the Project for Maiden Voyage of Guangzhou Basic and Applied Basic Research Scheme,China(Grant No.2024A04J4186)。
文摘Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in geometrically confined systems are crucial for the development of skyrmion-based spintronic devices. In this study, we focus on investigating the non-reciprocal transport behavior of skyrmions and their interactions with boundaries of various shapes. The shape of the notch structure in the nanotrack significantly affects the dynamic behavior of magnetic skyrmions. Through micromagnetic simulation, the non-reciprocal transport properties of skyrmions in nanowires with different notch structures are investigated in this work.
文摘利用溶剂热法制备纳米Fe 3 O 4,并将其分散在正硅酸乙酯(TEOS)水解液中,在表面沉积一层SiO_(2).用甲基丙烯酰氧基丙基三甲氧基硅烷(MPS)对SiO_(2)-Fe 3 O 4表面改性,得到MPS-SiO_(2)-Fe 3 O 4.将甲基丙烯酸(MAA)与己烯雌酚(DES)以摩尔比4∶1加入乙腈溶剂中,进行12 h自组装,再加入MPS-SiO_(2)-Fe 3 O 4、乙二醇二甲基丙烯酸酯(EGDMA)和偶氮二异丁腈(AIBN),进行超声分散30 min,65℃条件下机械搅拌,反应24 h,制得DES磁性分子印迹聚合物(MMIP).采用透射电镜、振动样品磁强计和吸附试验等方法进行表征分析.结果表明:MMIP的饱和磁化强度为268 kA/m,无磁滞现象,矫顽力为0,表现出超顺磁性,在磁铁作用下17 s就可与溶液分离;室温下,MMIP对DES的静态最大吸附量为7.1 mg/g,动态吸附时MMIP在60 min时可以达到静态最大吸附量的90%以上;MMIP对DES的印迹因子为3.70,因而对DES有较大的识别能力;MMIP可重复使用6次以上,具有良好的再生循环性能.
