MRI: Acquisition of a SQUID magnetometer for analysis of advanced materials

技术概述：超导量子干涉装置（SQUID）磁强计是一种非破坏性的技术，可以揭示许多类型材料中电子自旋相互作用的详细信息。该项目将涉及最先进的SQUID磁力计和磁性测量系统（MPMS），这是表征几种材料的关键工具，目前正在表面科学与技术实验室（LASST）和其他缅因大学（UMaine）实验室的研究人员进行研究。具体的测量能力包括直流和交流磁化率，磁电阻率，范德堡电导率和霍尔迁移率。最先进的MPMS能力将对缅因大学的几个研究项目特别有价值，这些项目涉及(i)纳米颗粒的表面磁性，（ii）沉积岩的磁各向异性，（iii）物理和化学传感设备的电传输，（iv）高磁场下纳米结构的光学特性，以及(v)基于磁性纳米颗粒的生物传感器。MPMS将成为培养磁性材料、纳米技术、生物物理学和材料科学领域的本科生、研究生、博士后和访问科学家的中心。这台仪器是一个关键的工具，用于扩大缅因在纳米技术、生物物理学、传感器技术和材料科学的磁性方面的研究能力。由于缅因州目前还没有SQUID磁力计，该仪器将为全州感兴趣的各方（包括非博士）的研究项目提供访问。资助机构和缅因州的小企业。该仪器相对容易操作，并提供电子自旋相互作用的直接信息，因此它将是一个强大的工具，用于向参与缅因州外展活动的不同组成部分教授物理和纳米技术概念，包括K-12学生和教师、普通公众、代表性不足的群体和行业合作伙伴。摘要：超导量子干涉装置（SQUID）磁强计是一种非破坏性的技术，可以揭示许多类型材料中电子自旋相互作用的详细信息。材料中电子相互作用的知识对于构建下一代计算机、电子学和生物磁筛选技术（即MRI）中的造影剂非常重要。为了获得必要的信息，一个控制磁场强度和温度的系统是至关重要的。为此，SQUID/磁性测量系统（MPMS）是这些测量的理想选择。该项目将购买最先进的MPMS系统，对缅因大学的几个研究项目尤其有价值，这些项目涉及纳米颗粒的表面磁性、沉积岩的磁各向异性、物理和化学传感设备的电传输以及基于磁性纳米颗粒的生物传感器。拟建的磁材料中心将成为培养磁性材料、纳米技术、生物物理学和材料科学领域的本科生、研究生、博士后和访问科学家的中心。由于缅因州目前还没有SQUID磁力计，该仪器将为全州感兴趣的各方（包括非博士）的研究项目提供访问。资助机构和缅因州的小企业。该仪器相对容易操作，并提供电子自旋相互作用的直接信息，因此它将是一个强大的工具，用于向参与缅因州外展活动的不同组成部分教授物理和纳米技术概念，包括K-12学生和教师、普通公众、代表性不足的群体和行业合作伙伴。

Technical Summary: Superconducting quantum interference device (SQUID) magnetometry is a non-destructive technique that reveals detailed information about the electron spin interactions in many types of materials. This project will involve a state-of-the-art SQUID magnetometer and Magnetic Property Measurement System (MPMS), which is a critical tool for characterizing several types of materials currently being investigated by researchers within the Laboratory for Surface Science & Technology (LASST) and other University of Maine (UMaine) laboratories. Specific measurement capabilities include DC and AC magnetic susceptibility, magnetoresistivity, van der Paaw conductivity, and Hall mobility. State-of-the-art MPMS capabilities will be especially valuable to several research programs at UMaine pertaining to (i) surface magnetism in nanoparticles, (ii) magnetic anisotropies in sedimentary rocks, (iii) electrical transport in physical and chemical sensing devices, (iv) optical properties of nanostructures in high magnetic fields, and (v) magnetic nanoparticle based biosensors. The MPMS will serve as a focal point for training undergraduates, graduate students, postdocs, and visiting scientists in magnetic materials, nanotechnology, biophysics, and materials science. This instrument is a critical tool for expanding the capacity of UMaine research into magnetic aspects of nanotechnology, biophysics, sensor technology, and materials science. As no SQUID magnetometer currently exists in the State of Maine, the instrumentation will provide access for research projects from interested parties throughout the state, including non-Ph.D. granting institutions and small Maine businesses. The instrument is relatively easy to operate and provides direct information on electron spin interactions, and thus it will be a powerful tool to teach physics and nanotechnology concepts to several different constituents participating in UMaine outreach activities, including K-12 students and teachers, the general public, under-represented groups, and industry partners.Layman Summary: Superconducting quantum interference device (SQUID) magnetometry is a non-destructive technique that reveals detailed information about the electron spin interactions in many types of materials. Knowledge of electron interactions in materials is extremely important in building the next generation of computers, electronics, and contrast agents in biological magnetic screening techniques (i.e. MRI). To gain the necessary information, a system with control over both the magnetic field strength and temperature is critical. To this end, a SQUID/Magnetic Property Measurement System (MPMS) is ideal for these measurements. This project will purchase a state-of-the-art MPMS system and will be especially valuable to several research programs at UMaine pertaining to surface magnetism in nanoparticles, magnetic anisotropies in sedimentary rocks, electrical transport in physical and chemical sensing devices, and magnetic nanoparticle based biosensors. The proposed MPMS will serve as a focal point for training undergraduates, graduate students, postdocs, and visiting scientists in magnetic materials, nanotechnology, biophysics, and materials science. As no SQUID magnetometer currently exists in the State of Maine, the instrumentation will provide access for research projects from interested parties throughout the state, including non-Ph.D. granting institutions and small Maine businesses. The instrument is relatively easy to operate and provides direct information on electron spin interactions, and thus it will be a powerful tool to teach physics and nanotechnology concepts to several different constituents participating in UMaine outreach activities, including K-12 students and teachers, the general public, under-represented groups, and industry partners.