Co/Ni多层膜的热处理研究

采用磁控溅射方法制备了Co/Ni多层膜并做了热处理,测量了系列样品的结构,磁性和磁电阻,受热处理条件等因素影响,多层膜的层间磁性耦合性质发生变化,电阻率下降,而其各向异性磁电阻的数值没有一致的变化趋势,讨论了磁性层织构和界面对多层膜的磁性和各向异性磁电阻效应的影响。     

Co/Cu纳米多层膜的制备及巨磁阻性能的研究

采用恒电位双电解槽法在硼酸镀液体系中,以单晶Si(111)为基底电沉积制备Co／Cu多层膜,确定了双槽法制备多层膜的工艺条件,为得到优良的多层膜巨磁阻材料,镀液体系中加入了自制的添加剂。并用扫描电镜(SEM)表征了多层膜的断面形貌,小角度X射线衍射(LXRD)谱图中出现了2个衍射峰,大角度X射线衍射(MXRD)谱图中强衍射峰的两侧出现了卫星峰,表明多层膜具有超晶格结构。用物性测量系统(PPMS)测试了Co／Cu多层膜的巨磁阻(GMR)性能,GMR值达到52．52％。     

Magnetic Structure Determinations at NBS/NIST

Magnetic neutron scattering plays a central role in determining and understanding the microscopic properties of a vast variety of magnetic systems, from the fundamental nature, symmetry, and dynamics of magnetically ordered materials to elucidating the magnetic characteristics essential in technological applications. From the early days of neutron scattering measurements at NBS/NIST, magnetic diffraction studies have been a central theme involving many universities, industrial and government labs from around the United States and worldwide. Such measurements have been used to determine the spatial arrangement and directions of the atomic magnetic moments, the atomic magnetization density of the individual atoms in the material, and the value of the ordered moments as a function of thermodynamic parameters such as temperature, pressure, and applied magnetic field. These types of measurements have been carried out on single crystals, powders, thin films, and artificially grown multilayers, and often the information collected can be obtained by no other experimental technique. This article presents, in an historical perspective, a few examples of work carried out at the NIST Center for Neutron Research (NCNR), and discusses the key role that the Center can expect to play in future magnetism research.     

W/SiC纳米多层膜的制备及表征

采用多靶磁控溅射制备了 Ｗ／ＳｉＣ纳米多层膜。并用 ＸＲＤ和 ＴＥＭ研究了 Ｗ／ＳｉＣ纳米多层膜的微结构。研究表明,Ｗ／ＳｉＣ纳米多层膜的调制结构界面平直、清晰、周期性好;ＳｉＣ调制层为非晶态,Ｗ调制层在大调制周期为纳米晶,并随调制周期减小逐渐转变为非晶态。