The compounds composed of transition metal cations and pnictide anions provide a rich platform for studying novel physical phenomena.Here we report on the observation of a phase transition at~70 K and 145 K in layered...The compounds composed of transition metal cations and pnictide anions provide a rich platform for studying novel physical phenomena.Here we report on the observation of a phase transition at~70 K and 145 K in layered compound EuCu_(4)As_(2)and SrCu_(4)As_(2),respectively.from both the transport and heat capacity.The thermal expansion measurements show that the variation of the lattice parameters(△L_(b)/L_(ab))around T_(P) is much less than that for a typical crystalline phase transition.Our experimental results reveal that the transition in EuCu_(4)As_(2)and SrCu_(4)As_(2)should be driven by subtle structural-distortion.展开更多
We report dynamics of skyrmion bubbles driven by spin-transfer torque in achiral ferromagnetic nanostripes using micromagnetic simulations.In a three-dimensional uniaxial ferromagnet with a quality factor that is smal...We report dynamics of skyrmion bubbles driven by spin-transfer torque in achiral ferromagnetic nanostripes using micromagnetic simulations.In a three-dimensional uniaxial ferromagnet with a quality factor that is smaller than 1,the skyrmion bubble is forced to stay at the central nanostripe by a repulsive force from the geometry border.The coherent motion of skyrmion bubbles in the nanostripe can be realized by increasing the quality factor to~3.8.Our results should propel the design for future spintronic devices such as artificial neural computing and racetrack memory based on dipolestabilized skyrmion bubbles.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2021YFA1600201)the National Natural Science Foundation of China(Grant Nos.U19A2093,U2032214,U2032163,U1732274,11904002,and 11874359)+5 种基金the Collaborative Innovation Program of Hefei Science Center,Chinese Academy of Sciences(CAS)(Grant No.2019HSC-CIP 001)the Youth Innovation Promotion Association of CAS(Grant No.2021117)the Natural Science Foundation of Anhui Province,China(Grant No.1908085QA15)the Director Fund from the Hefei Institutes of Physical Science(HFIPS)(Grant No.YZJJQY202304)the Director Fund from the the Chinese Academy of Sciences and Hefei Institutes of Physical Science(CASHIPS),China(Grant No.E26MMG71131)the High Magnetic Field Laboratory of Anhui Province,China。
文摘The compounds composed of transition metal cations and pnictide anions provide a rich platform for studying novel physical phenomena.Here we report on the observation of a phase transition at~70 K and 145 K in layered compound EuCu_(4)As_(2)and SrCu_(4)As_(2),respectively.from both the transport and heat capacity.The thermal expansion measurements show that the variation of the lattice parameters(△L_(b)/L_(ab))around T_(P) is much less than that for a typical crystalline phase transition.Our experimental results reveal that the transition in EuCu_(4)As_(2)and SrCu_(4)As_(2)should be driven by subtle structural-distortion.
基金the National Natural Science Foundation of China(Grant Nos.12174396 and 12104123)。
文摘We report dynamics of skyrmion bubbles driven by spin-transfer torque in achiral ferromagnetic nanostripes using micromagnetic simulations.In a three-dimensional uniaxial ferromagnet with a quality factor that is smaller than 1,the skyrmion bubble is forced to stay at the central nanostripe by a repulsive force from the geometry border.The coherent motion of skyrmion bubbles in the nanostripe can be realized by increasing the quality factor to~3.8.Our results should propel the design for future spintronic devices such as artificial neural computing and racetrack memory based on dipolestabilized skyrmion bubbles.
基金supported by the National Key R&D Program of China(2022YFA1403603)the National Natural Science Foundation of China(12174396,12104123,1197402,12204006,and 12241406)+5 种基金the National Natural Science Funds for Distinguished Young Scholar(52325105)Anhui Provincial Natural Science Foundation(2308085Y32 and 2108085QA21)Natural Science Project of Colleges and Universities in Anhui Province(2022AH030011)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB33030100)CAS Project for Young Scientists in Basic Research(YSBR-084)Systematic Fundamental Research Program Leveraging Major Scientific and Technological Infrastructure,Chinese Academy of Sciences(JZHKYPT-2021-08)。
