Acquisition of a DC-SQUID magnetometer

0647852 Banerjee该赠款支持获得超导量子干涉仪（SQUID）岩石磁力计（SRM），配置用于测量离散样本和连续沉积物岩心或U通道的剩磁。 SQUID SRM将取代现有的射频（RF）检测为基础的SRM安装在明尼苏达大学在1986年，并将允许检测剩磁高达三个数量级低于目前可能与RF-SRM，允许表征弱磁化沉积物和岩石。 目前，在明尼苏达大学的NSF支持的岩石磁性研究所（Institute for Rock Magnetism，简称MMR）国家多用户设施（MMR- 0218384）中，安装了各种专门的岩石磁性设备。 这种具有u通道能力的SQUID SRM将是用于在室温和零场下测量剩磁的基本工具。 此次收购将促进岩石磁学、环境磁学和古磁学的基础研究。 具体的内部岩石磁性研究的例子包括：1）精确描述颗粒间静磁相互作用及其对各种反射磁化特性的各向异性影响，以支持岩石组构的研究; 2）详细研究天然沉积物的磁性磁化率谱，以从沉积物和土壤记录中提取磁性矿物学和粒度的信息;（3）对含磁性氧化物包裹体的单晶硅酸盐矿物样品的自然剩磁进行灵敏的检测，以确定磁性载体相的来源。 u-通道连续测量沉积物岩芯剩磁的能力也将促进古地磁学、磁性地层学和环境磁学的研究。 这些研究对于了解地磁场的动态和揭示沉积古环境条件是重要的。 u通道SQUID SRM将通过地球科学研究所设施免费提供给更广泛的地球科学界。 该中心每年支持大量美国和国际科学家的岩石磁性和古地磁研究。 学生和博士后学者可以通过他们的访问学者计划，通过电子邮件主办的旅行支持获得该仪器。 研究所计划开发和分发一套特征良好的标准材料，所有获得的磁性数据将通过网络访问的岩石磁性数据库免费提供。 ***

0647852BanerjeeThis grant supports acquisition of a superconducting quantum interference device (SQUID) rock magnetometer (SRM) configured to measure the remanent magnetization of both discrete specimens and continuous sediment cores or u-channels. The SQUID SRM would replace an existing radio frequency (RF) detection based SRM installed at the University of Minnesota in 1986 and would allow for detection of magnetic remanence up to three orders of magnitude lower than currently possible with the RF-SRM, allowing for characterization weakly magnetized sediments and rocks. Currently a wide range of specialized rock magnetic equipment is housed at the NSF supported Institute for Rock Magnetism (IRM) national multi-user facility (EAR- 0218384) at the University of Minnesota. This u-channel capable SQUID SRM will be a fundamental IRM tool used for the measurement of magnetic remanence at room-temperature and zero-field. Fundamental research in rock magnetism, environmental and paleomagnetism will be facilitated by this acquisition. Examples of specific in-house rock magnetic research includes: 1) precise characterization of interparticle magnetostatic interactions and their anisotropic effects on the properties of various remanent magnetizations to support study of rock fabrics; 2) detailed studies of the magnetic coercivity spectra of natural sediments to extract information on magnetic mineralogy and grain size from sedimentary and soil records; and 3) sensitive detection of the natural remanence of single-crystal silicate mineral specimens containing exsolved magnetic oxide inclusions to resolve the origin of magentic carrier phases. Studies in paleomagnetism, magnetostratigraphy and environmental magnetism will also be facilitated by the u-channel capability for continuous measurement of magnetic remanence in sediment cores. Such studies are important to understand the dynamics of the geomagnetic field and to unravel depositional paleoenvironmental conditions. The u-channel SQUID SRM will be freely available to the broader geoscience community through the IRM facility. The IRM supports rock magnetic and paleomagnetic research by a large number of U.S. and international scientists annually. Students and postdoctoral scholars may gain access to the instrument via IRM hosted travel support through their Visiting Fellows program. The PIs plan to develop and distribute a set of well-characterized standard materials and all magnetic data acquired will be made freely available through web-accessible rock magnetic databases. ***