STM-Fabricated Magnets and their Influence on Semiconductor Electronics

这个跨学科的双校区项目采用了光学科学和凝聚态物理领域的尖端技术。超高真空扫描隧道显微镜将用于在III-V型半导体衬底和器件上直接合成单个和阵列磁性结构。结构的固有磁性行为将使用微观霍尔棒磁力计、Aharonov-Bohm环、弹道输运和高灵敏度机械扭矩测量来检查。磁性粒子对半导体中自旋相关电子态的影响将通过飞秒分辨法拉第和发光光谱仪进行研究。特别是，后者的研究包括空间分辨光学显微镜。这个实验和理论项目采用原子尺度光刻，低维电子传输和低温超快速磁光谱学来研究量子磁结构。这项工作的一个独特方面是原位制造直径只有几十个原子的“纳米磁铁”，其光学和磁性将被研究。这项工作包括半导体物理、光学和磁学。学生在光学科学和工程领域获得的培训将为他们提供广泛的职业机会。纳米级磁性半导体表现出新的磁光现象，目前还不完全了解，但被认为有很大的潜力作为可能的器件结构。＊＊＊

9510518 von Molnar This interdisciplinary, two-campus project employs cutting-edge techniques from the fields of optical science and condensed matter physics. An ultra-high-vacuum scanning tunneling microscope will be used to synthesize both individual and arrays of magnetic structures directly on III-V semiconductor substrates and devices. The intrinsic magnetic behavior of the structures will be examined using microscopic Hall bar magnetometers, Aharonov-Bohm rings, ballistic transport, and high-sensitivity mechanical torque measurements. The influence of magnet particles on the spin-dependent electronic state in semiconductors will be investigated through femto-second-resolved Faraday and luminescence spectroscopes. In particular, the latter studies include spatially-resolved optical microscopy. %%% This experimental and theoretical project employs atomic-scale lithography, low-dimensional electronic transpopt, and ultra-fast magnetooptical spectroscopies at low temperature to investigate quantum magnetic structures. A unique aspect of the work is the in situ fabrication of "nanomagnets" only a few dozen atoms in diameter, whose optical and magnetic properties will be investigated. The work encompasses semiconductor physics, optics, and magnetism. The training gained by students in the areas of optical science and engineering will prepare them for a wide spectrum of career opportunities. The nanosize magnetic semiconductors exhibit novel magnetooptical phenomena that are currently incompletely understood, but which are felt to have great potential as possible device structures. ***