High quality epitaxial single phase（Ga_（0.96）Mn_（0.04））_2O_3 and Ga_2O_3 thin films have been prepared on sapphire substrates by using laser molecular b（eam）epitaxy（L-MBE）. X-ray diffraction results indicate...High quality epitaxial single phase（Ga_（0.96）Mn_（0.04））_2O_3 and Ga_2O_3 thin films have been prepared on sapphire substrates by using laser molecular b（eam）epitaxy（L-MBE）. X-ray diffraction results indicate that the thin films have the monoclinic structure with a 201 preferable orientation. Room temperature（RT） ferromagnetism appears and the magnetic properties of β-（Ga_（0.96）Mn_（0.04））_2O_3 thin film are enhanced compared with our previous works. Experiments as well as the first principle method are used to explain the role of Mn dopant on the structure and magnetic properties of the thin films. The ferromagnetic properties are explained based on the concentration of transition element and the defects in the thin films.展开更多
We report a numerical study on the role of longrange dipolar interaction played on the creation and stabilization of skyrmion-(non)crystal structure in chiral ferromagnetic thin films without any anisotropies,based on...We report a numerical study on the role of longrange dipolar interaction played on the creation and stabilization of skyrmion-(non)crystal structure in chiral ferromagnetic thin films without any anisotropies,based on a Monte-Carlo simulation method.With the increase of external magnetic field,the microscopic spin configuration is transformed from a spin-spiral stripe or labyrinth structure,depending on the strength of dipolar interaction,into a skyrmion-(non)crystal structure,and then into a skyrmiongas structure,and finally into a ferromagnetic state.Interestingly,with the increase of dipolar interaction,the skyrmion-crystal structure evolves from a triangular arrangement into a square arrangement with the change of skyrmion shape from circle to square.For larger dipolar interactions,the skyrmion-crystal structure loses the regular arrangements and the skyrmions,remaining topological,exhibit different shapes and sizes and squeeze with each other,whose distributions are analogous to a non-crystal structure.Therefore,different skyrmion-(non)crystal structures are stabilized in different ranges of dipolar interactions,which further promotes the applications of skyrmions as non-volatile information carriers.展开更多
基金Project supported by the National Natural Science Foundation of China(Nos.11404029,51572033,51172208)the Fund of State Key Laboratory of Information Photonics and Optical Communications(BUPT)
文摘High quality epitaxial single phase（Ga_（0.96）Mn_（0.04））_2O_3 and Ga_2O_3 thin films have been prepared on sapphire substrates by using laser molecular b（eam）epitaxy（L-MBE）. X-ray diffraction results indicate that the thin films have the monoclinic structure with a 201 preferable orientation. Room temperature（RT） ferromagnetism appears and the magnetic properties of β-（Ga_（0.96）Mn_（0.04））_2O_3 thin film are enhanced compared with our previous works. Experiments as well as the first principle method are used to explain the role of Mn dopant on the structure and magnetic properties of the thin films. The ferromagnetic properties are explained based on the concentration of transition element and the defects in the thin films.
基金financially supported by the National Natural Science Foundation of China(No.11774045)the Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science(No.20180510008)。
文摘We report a numerical study on the role of longrange dipolar interaction played on the creation and stabilization of skyrmion-(non)crystal structure in chiral ferromagnetic thin films without any anisotropies,based on a Monte-Carlo simulation method.With the increase of external magnetic field,the microscopic spin configuration is transformed from a spin-spiral stripe or labyrinth structure,depending on the strength of dipolar interaction,into a skyrmion-(non)crystal structure,and then into a skyrmiongas structure,and finally into a ferromagnetic state.Interestingly,with the increase of dipolar interaction,the skyrmion-crystal structure evolves from a triangular arrangement into a square arrangement with the change of skyrmion shape from circle to square.For larger dipolar interactions,the skyrmion-crystal structure loses the regular arrangements and the skyrmions,remaining topological,exhibit different shapes and sizes and squeeze with each other,whose distributions are analogous to a non-crystal structure.Therefore,different skyrmion-(non)crystal structures are stabilized in different ranges of dipolar interactions,which further promotes the applications of skyrmions as non-volatile information carriers.
