Construction of a Low-Temperature Scanning SQUID Susceptometer

9802719 莫勒 该奖项为低温扫描系统的构建提供了部分支持，该系统旨在使用微型磁阻计研究单个电子和磁性纳米结构的磁化。 超导量子干涉仪基于超导量子干涉器件（SQUID）。具有微米级空间分辨率的微型SQUID可以检测到小至1000个电子自旋的磁矩，比商业上可用的大体积磁力计小9个数量级。 这种灵敏的磁测量为量子混沌、宏观量子相干、超导和磁性的研究带来了巨大的希望。 然而，目前，这种技术的前景受到将每个样品与其自己的SQUID集成的缓慢过程的限制。 扫描流速计有几个优点。 首先，在每次冷却过程中可以研究许多样品，方法是将分离良好的个体介观物体放在同一基底上。 第二，背景辨别可能容易得多，因为SQUID可以从样品移开。 第三，扫描磁强计将不限于可以集成到与SQUID相同的芯片上的样品。 除了是研究介观磁化的理想工具外，该装置还可用于对多种材料进行精确、定量、局部磁化率测量。 %%% 该奖项将提供独特的能力，研究介观材料系统，是重要的磁性研究。 可能对实地产生广泛影响。 将增加该领域的多样性，并提供新的教育机会。.

9802719 Moler This award provides partial support for the construction of a low-temperature scanning system, designed for using miniature susceptometers to study the magnetization of individual electronic and magnetic nanostructures. The susceptometers are based on Superconducting QUantum Interference Devices (SQUIDs). Miniature SQUIDs with micron-scale spatial resolution can detect magnetic moments as small as a thousand electron spins, nine orders of magnitude smaller than can be detected by commercially available bulk magnetometers. Such sensitive magnetic measurements hold great promise for the study of qunatum chaos, macroscopic quantum coherence, superconductivity, and magnetism. At present, however, the promise of this technique is limited by the slow process of integrating each sample with its own SQUID. A scanning susceptometer would have several advantages. First, many samples could be studied in each cooldown, by placing well-separated individual mesoscopic, objects on the same substrate. Secondly, background discrimination could be much easier, since the SQUID could be moved away from the sample. Thirdly, a scanning susceptometer would not be limited to samples which can be integrated onto the same chip as the SQUID. In addtion to being an ideal tool to study mesoscopic magnetization, this apparatus could be used to make precise, quantitative, local magnetic susceptibility measurements of a wide range of materials. %%% This award will provide unique capability to study mesoscopic materials systems; is important for magnetism studies. Potential for broad impact on field. Will increase diversity in field and offer new educational opportunities.*** .