共查询到17条相似文献,搜索用时 218 毫秒
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室温下采用VSM测定了离子束溅射(IBSD)技术制备的Co/Pt多层膜垂直方向的M-H回线。研究结果表明:Co/Pt多层膜中单位体积Co的饱和磁化强度MsCo小于块状Co的饱和磁化强度;Co/Pt多层膜的饱和磁化强度(Ms)与厚度有关:随Co层厚度tPt和多层膜总厚度tf的增加而增大,随Pt层厚度tpt的增加而减小;外推结果表明当tCo小于一个原子层厚(≈025nm)时,室温下Co/Pt多层膜的饱和磁化强度为零,呈顺磁性 相似文献
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采用高角X射线衍射(HXRD)和TEM研究用离子束溅射(IBSD)技术制备的Co/Pt多层膜的晶体结构和显微组织形貌,结果表明:Co/Pt多层膜的晶体结构与Co、Pt层厚度tCo、tPt密切相关。当tCo<tPt<210时,Co、Pt层为共格fcc结构,随tCo、tPt增加,逐渐向非共格关系转变,同时,Pt、Co层晶格发生了严重畸变。TEM发现Co/Pt多层膜的组织形貌明显受基底影响,与沉积在Si基底表面上的Co/Pt多层膜相比,沉积在NaCl上的Co/Pt多层膜的晶粒出现择优取向且呈条纹状分布,晶粒明显粗化 相似文献
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用磁控溅射技术制备了系列Fe/Ti纳米多层膜,周期调制在2.2-24.0nm,用透射电镜和小角,高角X射线衍射分别研究了样品的结构;用振动样品磁强计和Moessbauer谱研究了样品的磁性。发现铁层厚度在2nm附近时在铁磁性面立方γ-Fe,样品的易磁化方向平行于膜面;随调制周期增大,样品的饱和磁化强度增加,矫顽力下降且与结晶状态有关。 相似文献
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用磁控溅射方法制备了Ni80Co20/M(M=Co,Cr,Ag)多层膜样品系列,Co,Cr,Ag杂质层的标称厚度为0.1nm,研究了界面散射对多层膜的磁及输运性质的影响.零场电阻率ρ的测量结果表明,对含Cr样品,ρ随杂质层间距L的依赖关系能较好的用Fuchs-Sondheimer(F-S)理论描述.而对含Co和Ag样品,ρ随L的依赖关系在L小于15nm时开始偏离F-S理论.磁电阻测量表明,含Cr和Ag样品,各向异性磁电阻Δρ在L<15nm时随L的减小陡然下降.对含磁性Co元素的样品,其Δρ值在L>15nm时高于Ni80Co20单层薄膜的Δρ值;在L<15nm时Δρ值随L呈现振荡变化的趋势.磁性测量表明,三个系列样品的矫顽力Hc在L<15nm时都随L近似直线上升,在L>15nm后趋于饱和;经400℃真空退火后Hc都显著下降. 相似文献
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Co/Pt multilayers with perpendicular anisotropy were deposited using a dc magnetron sputtering system under high vacuum. Magnetization process was investigated by the measurement of magnetic components parallel and perpendicular to the applied field. A dependence of the coercivity of Co/Pt multilayers on the Co layer thickness was reported, in which the total thickness of Co layers kept constant. It is observed that the coercivity increases with the increment of Co layer thickness. For the samples with the same Co layer thickness while different total Co layer thickness, the coercivity first increases and then decreases with the increase of the total thickness of Co layers. This effect could be attributed to the competition between the reduction of HC related to incoherent reversal and the step-up of HC contributed by the magnetic polarization of Pt atoms at the interface of Co and Pt layers during magnetization reversal. The results show that the change of the coercivity is strongly related to the Co layer thickness, but not the total thickness of Co layers. The dependence of the coercivity on the angle between an applied field and the easy axis shows that the nucleation mode is dominant in magnetization reversal process of the samples. 相似文献
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B.X. Gu 《金属学报(英文版)》1999,12(2):181-184
1.IntroductionMultilayershaveattractedconsiderableattentionfromfundamentalandtechnologicalinterests.Manynewphenomenainmetal-metalmultilayers,suchasthereductionorenhancementofmagnetizationatinterfaces[1],themagneticanisotropyl'1,theoscillatoryinterlay... 相似文献
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Pseudo spin valves(SVs) exhibiting perpendicular magnetic anisotropy were prepared by magnetron sputtering. Magnetization measurements of the Co/Pt multilayers were performed to select the reference and free layers. The selection criteria are square magnetic hysteresis loops, weaker current shunting effect, and proper coercivity. The optimal reference layer and free layer are Pt(5.0 nm)/[Co(0.4 nm)/Pt(0.6 nm)]3/Co(0.4 nm)/Cu(3.0 nm)and Cu(3.0 nm)/[Co(0.4 nm)/Pt(1.5 nm)]4, respectively.The resulting pseudo SV exhibits two well-separated hysteresis loops when the field is applied perpendicular to the film plane. The minor hysteresis loop corresponding to the free layer shifts toward negative direction of the magnetic field axis, indicating ferromagnetic interlayer exchange coupling between the two magnetic layers. The coupling also enhances the coercivity(HC) of both layers. The perpendicular giant magnetoresistance(GMR) of 2.7 % is achieved with current in plane measurement. The GMR first increases when Pt seed layer is thickened, reaches a maximum of 3.0 % at 4 nm and then decreases with the further increase of thickness. But thicker Cu spacer layer always lowers the GMR of the SV. 相似文献
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Fe/Gd multilayers were prepared by alternate vapor deposition of pure Fe and Gd at a rate of 0.01-0.03 nm/s in an ultra-high-vacuum electron-gun evaporation system.The effects of the constituent metal layer thickness on the microstructures and magnetic properties of the films were investigated by low angle X-ray diffraction,transmission electron microscopy,and vibrating sample magnetometer.The experimental results show that a transition from the polycrystalline to amorphous state in the Fe layers occurs with the decrease of Fe layer thickness in the Fe/Gd multilayers.The saturation magnetization of the muitilayers reduces significantly with decreasing Fe layer thickness and increasing Gd layer thickness.A superparamagnetic behavior at room temperature is observed for the [Fe(0.6 nm)/Gd(4.0 nm)]15 multilayer due to the formation of discontinuous Fe layers. 相似文献
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