MRI: Acquisition of a Physical Property Measurement System for Materials Science Research and Education

美国天主教大学(CUA)将获得一种新的物理特性测量系统(PPMS)，该系统具有交流磁测量和振动样品磁强计选项，将与霍华德大学和弗吉尼亚联邦大学的研究人员共享。PPMS将能够在2.0-400K的温度范围内测量各种物理性质，磁场高达7特斯拉。EverCool杜瓦完全避免了他输送液体的需要，并在大多数操作条件下将PPMS的氦损失降至最低。有氦气体输入的自动控制，以补充随着时间的推移失去的东西，并自动保持杜瓦瓶中的最佳液氦水平。该仪器可测量磁矩、交流磁化率、电输运、磁阻和霍尔效应。收购该仪器将有助于：调查硅和锗等半导体通道中的自旋注入和检测，以及界面对这些通道中有效的自旋转移的影响；调查硅基纳米线中观察到的依赖于自旋的大尺寸传输特性；研究由FeGa组成的铁磁纳米线，用于广泛的国防和工业领域，如换能器和传感器；在纳米尺度上了解磁铁矿的基本物理；表征作为分子存储器件或开关的新型自旋交叉络合物；以及开发用于新型生物植入物的铁磁生物陶瓷，尤其是用于骨骼以及治疗各种疾病和输送药物的应用。这台仪器的收购将极大地增强我们目前的能力，并为CUA的材料研究增加一个新的维度。它还将对纳米生物材料和材料科学的新倡议产生影响。这个新的设施将汇集来自不同领域的研究人员，导致思想交流和新的联合研究项目，并将作为催化剂，进一步扩大中大S科学和工程项目，并加强与哥伦比亚区及其周边大学的合作。非技术摘要对材料性能的改进和了解对于开发新型的下一代电子、磁性和自旋电子设备至关重要。医疗领域现在也在很大程度上依赖于用于生物植入、药物输送和新的治疗选择的创新和纳米级材料和设备。美国天主教大学的研究人员积极参与研究纳米设备、纳米粒子、生物材料和无机络合物的电子和磁性传输特性。购买具有交流磁力测量和振动样品磁强计选件的物理性能测量系统，将使科学和工程部门的多个用户能够获得材料和设备的电、磁和磁运输测量。了解这种材料和纳米器件的特性对于推动我们未来经济的先进技术至关重要。该仪器是用于研究、表征和评估具有广泛性能的材料的重要工具。它将被用来指导天主教大学的科学家努力设计新的纳米级设备，这种设备将使用电子自旋态来存储和处理信息，这将为大幅改进计算和新一代低功耗、高密度和快速的电子电路奠定基础。此外，了解某些磁性材料(铁氧化物)在纳米尺度上的基本物理对于生物医学行业的新技术进步至关重要，特别是在生物植入和药物输送方面。它还将帮助研究人员研究被称为自旋交叉络合物的新材料，这些络合物作为分子存储器件或开关非常有兴趣，如果完全了解，可能会在电子和计算机组件的小型化方面取得重大进展。该文书将为天主教、霍华德和弗吉尼亚联邦大学等大华盛顿地区大学之间的合作努力提供基础。它还将用于通过本科生、研究生和博士后研究培养未来几代科学家。新的能力还将有助于扩大我们在培训来自华盛顿大都会地区的少数族裔和代表性不足的高中生方面的努力。

0922997PhilipCatholic U.Technical AbstractThe Catholic University of America (CUA) will acquire a new Physical property measurement system (PPMS) with AC magnetometry and vibrating sample magnetometer options to be shared with researchers at Howard University and Virginia Commonwealth University. The PPMS will be able to measure a variety of physical properties, over a range of temperatures from 2.0 - 400 K, and with magnetic fields up to 7 Tesla. The EverCool dewar completely avoids the need for liquid He transfers and to minimize helium loss from the PPMS under most operating conditions. There is automatic control of the He gas input to replenish what is lost over time and to automatically maintain optimal liquid helium levels in the dewar. The instrument provides for measurement of the magnetic moment, AC susceptibility, electrical transport, magnetoresistance and Hall effect. The acquisition of this instrument will enable: the investigation of spin injection and detection in semiconducting channels such as Si and Ge as well as the effects of interfaces on efficient spin transfer into these channels; the investigation of the large spin-dependent transport properties observed in Si-based nanowires; the study of ferromagnetic nanowires composed of FeGa for a wide range of defense and industrial applications as transducers and sensors; understanding the fundamental physics of the magnetite at the nanoscale; characterizing new spin crossover complexes that are of great interest as molecular memory devices or switches; and the development of ferromagnetic bioceramics for new bioimplants especially for bone and also for treating various diseases and delivering drugs. The acquisition of this instrument will greatly enhance our present capabilities and add a new dimension to materials research at CUA. It will also have an impact on the new initiatives in nano-biomaterials and in materials science. This new facility will bring together researchers from different areas, leading to an exchange of ideas and new joint research projects and will serve as a catalyst for further expansion in CUA?s science and engineering programs and greater collaboration with Universities in and around the District of Columbia.Non-technical AbstractThe advancement and understanding of materials properties are critical for developing novel next generation electronic, magnetic and spin electronic devices. The medical field also now depends greatly on innovative and nanoscale materials and devices for bioimplants, drug delivery and newer treatment options. Researchers at the Catholic University of America are actively involved in investigating the electronic and magneto-transport properties of nanoscale devices, nanoparticles, biomaterials and inorganic complexes. The acquisition of a Physical Property Measurement System with AC magnetometry and Vibrating Sample Magnetometer options will allow multiple users within the science and engineering departments to have access to electrical, magnetic and magneto-transport measurements of materials and devices. Understanding the material and the nanoscale device properties are crucial for advanced technologies that will drive our future economy. This instrument is an essential tool used to study, characterize and evaluate materials with a wide range of properties. It will be used to guide the scientists at the Catholic University in their efforts to design new nanoscale devices that will employ electron spin states to store and process information, which will pave a foundation for a dramatic improvement in computing and a new generation of low power consuming, highly dense and fast electronic circuits. Also understanding the fundamental physics at the nanoscale of certain magnetic materials (oxides of iron) are vital for new technological advances in the biomedical industry especially for bioimplants and drug delivery. It will also help researchers to investigate new materials called spin crossover complexes, which are of great interest as molecular memory devices or switches and when fully understood could lead to significant advances in the miniaturization of electronic and computer components. This instrument will provide the foundation for collaborative efforts among greater Washington area universities such as Catholic, Howard and Virginia Commonwealth University. It will be also used to train future generations of scientists through undergraduate, graduate and postdoctoral research. The new capability will also help to expand our efforts in training minority and under-represented high school students from DC metro area.