物理化学学报 >> 2007, Vol. 23 >> Issue (08): 1163-1167.doi: 10.1016/S1872-1508(07)60061-8

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Co-Ni合金薄膜的电化学外延及同步辐射XMCD研究

王立武; 李宗木; 张文华; 徐法强; 王劼; 闫文盛   

  1. 中国科学技术大学国家同步辐射实验室, 合肥 230029
  • 收稿日期:2007-03-16 修回日期:2007-04-11 发布日期:2007-08-03
  • 通讯作者: 徐法强 E-mail:fqxu@ustc.edu.cn

Electrochemical Epitaxy and XMCD Study of Co-Ni Alloy Film

WANG Li-Wu; LI Zong-Mu; ZHANG Wen-Hua; XU Fa-Qiang; Wang Jie; YAN Wen-Sheng   

  1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, P. R. China
  • Received:2007-03-16 Revised:2007-04-11 Published:2007-08-03
  • Contact: XU Fa-Qiang E-mail:fqxu@ustc.edu.cn

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摘要： 采用电化学循环伏安法在单晶GaAs(001)衬底上外延沉积了Co-Ni二元合金薄膜. 扫描电子显微镜观察结果显示, 薄膜厚度约180 nm, 其表面由约40 nm大小的颗粒组成. 用X射线荧光法确定了薄膜的组分为Co66Ni34, XRD确定了其为面心立方结构. 用同步辐射圆偏振软X射线分别测量了样品中Co和Ni的吸收谱(XAS), 从而得到X射线磁性圆二色(XMCD)谱, 通过加和定则分别计算出了合金中Co和Ni的轨道磁矩和自旋磁矩, 与纯的Co和Ni样品相比, 它们都有不同程度的增加.

关键词: 循环伏安法, Co-Ni合金, 同步辐射XMCD, 轨道磁矩, 自旋磁矩

Abstract: Using the electrochemical cyclic voltammetry, Co-Ni alloy filmwas deposited on single crystal GaAs(001) substrate. With the scanning electron microscopy (SEM) and X-ray fluorescence (XRF), the thickness of the film was about 180 nm and the surface of the alloy was composed of 40 nm-sized Co66Ni34 nanograins. The faced center cubic structure of the alloy was confirmed using X-ray diffraction (XRD). The X-ray magnetic circular dichroism (XMCD) spectra of Co and Niwere obtained from the X-ray absorption spectra (XAS) results using synchrotron radiation circularly polarized soft X-ray. According to the sum rules, the orbital and the spin magnetic moments of Co and Ni were separately obtained. Compared with the pure Co and Ni samples, the orbital and the spin magnetic moments of Co and Ni in the epitaxial Co-Ni alloy showed an increase to some extent.

Key words: Cyclic voltammetry, Co-Ni alloy, Synchrotron radiation XMCD, Orbital magnetic moment, Spin magnetic moment

MSC2000: 

  • O646