[CoPt 1.5 nm/ZrO2 x nm]10 multilayer films were deposited on glass substrates by magnetron sputtering and then an-nealed in vacuum at 600°C for 30 min. Their structures and magnetic properties were investigated as a function of ZrO2 content. The results show that the grain size and coercivity first increase and then decrease with the increase in ZrO2 content. The maximum coercivity and grain size are obtained at 37 vol.% of ZrO2. The content of ZrO2 in the film plays an impor-tant role in the separation of CoPt grains and in the reduction of intergrain exchange interaction. On the basis of the studies of angular dependent coercivity, it is found that the magnetization reversal of CoPt films with (111) texture is different from either the domain wall motion or the S-W type of rotation mode.
SHEN Xiaohua XU Xiaohong JIANG Fengxian LV Baohua TIAN Baoqiang JIN Tao
The magnetic properties and structures of [CoPt/Ag]n multilayer films deposited by DC magnetron sputtering have been studied. During the deposited process, two kinds of deposited sequences, that is Ag layer (FDAG) first deposited or CoPt layer (FDCP) first deposited, have been chosen. The results show that the microstructures and coercivities were strongly influenced by the deposited sequence and the thickness of films. The coercivities of [Ag/CoPt]n with FDAG are obviously higher than those of [CoPt/Ag]n with FDCP. Especially, when the thickness of films is 8 nm, the difference of coercivities between the FDAG film and the FDCP film is the largest. It is possibly because Ag plays a role of underlayer in FDAG multilayers, which can induce both the transformation from fcc to fct and the oriented growth along c-axis. In addition, δ M curves reveal that the [CoPt/Ag]8 multilayer film has a lower intergrain interaction than the CoPt/Ag bilayer film.
In this study the complex Mg（Sal2trien） was synthesized for the first time, the binding mode of which with CT DNA was studied by the methods of UV spectra, fluorescence spectra, viscosity and CV （cyclic voltammetry）. It was found that after the com- plex acted with CT DNA, the Abs of UV spectra rose obviously; the fluorescence intensity of EB-DNA was almost not changed; viscosity decreased. Determina- tion of cyclic voltammetry showed that DNA made the MgL’s formal potential negatively shift. Scatchard plot showed that the addition of the binding mode of the complex to EB was uncompetitive inhibition com- pared with EB to DNA. So the binding mode of the complex with CT DNA was stable-electricity binding. Then the interaction of the complex with pBR322 was studied by the method of gel electrophoresis. The result showed that the complex could cleave pBR322 DNA effectively.
XI Xiaoli YANG Manman ZHOU Chengyong ZHAO Jing YANG Pin
