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首页> 外文学位 >A scanning near-field optical microscope with magneto-optic Kerr effect contrast for the imaging of magnetic domains with 200 angstrom resolution.
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A scanning near-field optical microscope with magneto-optic Kerr effect contrast for the imaging of magnetic domains with 200 angstrom resolution.

机译：具有磁光Kerr效应对比的扫描近场光学显微镜，用于以200埃分辨率成像的磁畴。

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摘要

We describe the development of a scanning near-field optical microscope for magnetic domain imaging in thin-film materials. The near-field probe is a 20-40 nm Ag particle which is optically excited near the surface plasmon resonance frequency. The plasmon resonance in individual Ag particles is characterized by optical spectroscopy for light scattered from single Ag particles. The existence of a near-field form of the magneto-optic Kerr effect is confirmed. In the final form of the microscope, the Ag particle is mounted on a hemispherical glass substrate and brought to within near-field proximity of a flat sample surface. The separation of the probe and sample is regulated by a Newton ring interferometer in closed loop feedback control of a piezoelectric translator. Separation stability can be kept to less than one nanometer. Near-field magneto-optic interactions are measured with a shot-noise limited modulating ellipsometer. We measured the dependence of the near-field Kerr signal on the separation of the probe and sample for longitudinal magnetization, and suggest a potential resolution of 20-40 nm. Two-dimensional images are presented of thermo-magnetically recorded domains in a Co/Pt multilayer material, with less than 100 nm resolution. Domains with a 0.5 micron diameter and one micron spacing are clearly resolved. We discuss future improvements of the instrument and propose an ultimate resolution of 140 A.
机译：我们描述了一种用于薄膜材料中磁畴成像的扫描近场光学显微镜的开发。近场探针是20-40 nm的银粒子，在表面等离子体共振频率附近被光激发。单个Ag颗粒中的等离激元共振通过光谱学来表征从单个Ag颗粒散射的光。确认了磁光克尔效应的近场形式的存在。在显微镜的最终形式中，将Ag颗粒安装在半球形玻璃基板上，并置于平坦样品表面的近场范围内。在压电转换器的闭环反馈控制中，通过牛顿环干涉仪调节探针和样品的分离。分离稳定性可以保持小于一纳米。近场磁光相互作用是通过散粒噪声有限的调制椭圆仪测量的。我们测量了近场Kerr信号对探针和样品分离的纵向磁化强度的依赖性，并提出了20-40 nm的潜在分辨率。呈现了Co / Pt多层材料中小于100 nm分辨率的热磁记录磁畴的二维图像。直径为0.5微米且间距为1微米的区域可以清楚地解析。我们讨论仪器的未来改进，并提出最终分辨率140A。

著录项

  • 作者

    Silva, Thomas Joseph.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Electronics and Electrical.;Physics Optics.;Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 284 p.
  • 总页数 284
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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