Acquisition of A SQUID Magnetometer

申请资金用于购买SQUID磁强计，以进行超晶格、多层、颗粒固体、亚稳合金、低维量子磁体和其他具有低维磁性和超导实体的系统的各种研究项目，由NSF资助。这些样品将通过多道先进溅射沉积、分子束外延和单晶生长来制备。这些系统的目的是揭示有限尺寸效应和尺寸交叉的磁性和超导系统与各种相关长度。研究了磁表面各向异性和垂直磁化的实现和起源。我们将研究分子束外延生长的异质结构和超晶格的表面和界面磁性。在超导/磁性多层膜中，实验被提出来研究对超导性的影响与磁性层的磁有序和导电性之间的关系。将研究一些亚稳固体系统，以揭示传统方法无法获得的结构中的新特性。低维反铁磁体为探索量子多体效应提供了独特的机会。在粒状磁性系统中的巨磁输运性质的各种问题将被探讨。 这些都是具有根本意义的问题，其中许多问题具有重要的技术影响。在所有这些研究中，具有低场和可变频率能力的高灵敏度SQUID磁强计是必不可少的。 要求提供资金，用于购置超导量子干涉仪磁力计，这是最灵敏的磁力计类型，以便在超晶格、多层、粒状固体、亚稳合金、低维量子磁体和其他具有低维磁性和超导实体的系统方面开展各种研究项目，这些项目由国家科学基金会供资。这些都是基本感兴趣的问题，其中许多具有重要的技术应用，如磁记录介质，磁记录头中的场传感元件和超导器件。

Funds are requested for the acquisition of a SQUID magnetometer to conduct a variety of research projects in superlattices, multilayers, granular solids, metastable alloys, low dimensional quantum magnets, and other systems with low-dimensional magnetic and superconducting entities, funded by the NSF. These samples will be fabricated by multisource advanced sputter deposition, molecular beam epitaxy and single crystal growth. These systems are designed to reveal finite-size effects and dimensional crossover in magnetic and superconducting systems with various correlation lengths. The realization and the origin of magnetic surface anisotropy and perpendicular magnetization will be investigated. Surface and interfacial magnetism of a variety of heterostructures and superlattices grown by MBE will be studied. In superconductor/magnetic multilayers, experiments are proposed to investigate the relationship between the effects on superconductivity and the magnetic ordering and conductivity of the magnetic layers. A number of metastable solid systems will be studied in order to reveal new properties in structures unattainable by conventional methods. Low dimensional antiferromagnets provide unique opportunities to explore quantum many-body effects. Various issues of the giant magneto-transport properties in granular magnetic systems will be explored. These are problems of fundamental interest, many of them having important technological implications. In all these studies, a high sensitivity SQUID magnetometer with low- field and variable frequency capabilities is imperative. Funds are requested for the acquisition of a superconducting quantum interference device (SQUID) magnetometer, the most sensitive type of magnetometers, to conduct a variety of research projects in superlattices, multilayers, granular solids, metastable alloys, low dimensional quantum magnets, and other systems with low-dimensional magnetic and superconducting entities, funded by the NSF. These a re problems of fundamental interest, many of them having important technological applications, such as magnetic recording media, field-sensing elements in magnetic recording heads, and superconducting devices.