作者机构：
[罗永松; 章平; 黄致新; 张玉龙; 刘敏; 王辉; 吴斌] College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China;[张玉龙; 章平] Department of Physics, Yunyang Teachers College, Danjiangkou 442700, China
通讯机构：
College of Physical Science and Technology, Central China Normal University, China
摘要：
Amorphous (Sm)TbCo/Cr films with perpendicular anisotropy were prepared by r.f magnetron sputtering. The magnetic properties and the effects of Tb substituted with Sm on the magnetic properties of TbCo/Cr films were investigated. After part Tb substituted with Sm, the RE-TM alloy film possess large perpendicular anisotropy. The substitution effects on saturation magnetization can be explained with the ferri-magnetical structure of RE-TM alloy film. By choosing optimal sputtering parameters and suitable Sm substituting fraction, the anisotropy constant as high as 4.15 ×10<sup>6</sup> erg·cm<sup>-3</sup>, the saturation magnetization above 380 emu·cm<sup>-3</sup> and the coercivity above 4.5 kOe can be obtained at room temperature for (Sm<inf>x</inf>Tb<inf>1-x</inf>)<inf>31</inf>Co<inf>69</inf> films.
作者机构：
[Ding, XX; Huang, ZX; Gan, ZW; Tang, C; Huang, XT; Cheng, C; Qi, SR] Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Gan, ZW] C;Cent China Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
Oxide;Silicon;Thin Film;SiO2;Boron
摘要：
A novel method was demonstrated to fabricate boron nitride nanotube films on silicon substrate in a location-controlled fashion. The pre-deposited SiO2 layer on the substrate controls the growth space of BN nanotubes synthesized by an ammonothermal reaction of boron and its oxide.
关键词：
metal materials;terbium-cobalt;amorphous;film;anisotropy;rare earths
摘要：
The amorphous TbCo/Cr films with perpendicular magneto-anisotropy were prepared by nonbiased r.f magnetron sputtering and the effects of Cr underlayer on the magnetic properties of TbCo films were investigated. It is found that both the TbCo layer thickness and the Cr underlayer can influence the magnitude of anisotropy for TbCo films. A perpendicular anisotropy as high as 4.57×106 erg·cm-3 was obtained in 120 nm thick Tb31C69 films with a 180 nm thick Cr underlayer. But it is only 3.24×106 erg*cm-3 for the Tb31Co69 film without Cr underlayer of the same thickness. The cross-sectional SEM observations indicate that the TbCo films with Cr underlayer consist of columns structure. It is considered that this heterogeneous structure gives rise to the anisotropy enhancement of TbCo films in case with Cr underlayer.
摘要：
Comparative study on the diameter distribution of MgO nanowires has been carried out. MgO nanowires could be synthesized by the direct reaction between metallic magnesium and silica, and the obtained nanowires have diameters ranging from 50 to 200 nm and lengths of several hundreds nanometers, exhibiting a straight wire. The diameter can be downscaled to smaller than 50 nm, and the nanowire exhibits a curved and twisted one-dimensional structure with lengths up to several micrometers, when a fine support catalyst was used as the reactant. The diameter-controlled growth mechanism was also explained in this work.
摘要：
The effects of Sm substitution on magnetic and magneto-optical properties of TbCo/Cr films have been investigated. It was found that partial Tb substituted by Sm will directly affect the magnitude of saturation magnetization Ms and the Kerr rotation angle. These results are explained by the ferri-magnetical structure of the rare earth-transition metal alloy. When the magnetic layer composition was (Sm_(0.343)Tb_(0.657))_(31)Co6_9, values of magnetization as high as 385 emu/cm~3 and coercivity above 4.7 kOe at room temperature were obtained.
摘要：
Nanobamboo and nanotube structures of BN have been controllably synthesized by reaction of barium metaborate with ammonia. The gallium addition plays an important role in the formation of nanotubes. The experimental results indicate that, without the gallium additive, the reaction results in the growth of nanobamboo structure. Gallium addition, probably as a catalyst within the framework of vapor–liquid–solid growth, promotes the growth of nanotubes. High-solution transmission electron microscopy research indicates that rhombohedral stacking order is the dominant atomic arrangement for BN nanobamboos; whereas hexagonal stacking is the dominant arrangement for BN nanotubes.
