Proposal to Purchase a SQUID magnetometer

通过化学研究仪器和设施（CRIF）项目的奖励，弗吉尼亚理工学院和州立大学化学系将获得超导量子界面器件（SQUID）磁力计。该设备将使研究人员能够进行以下研究：a)分子基磁体的合成和表征；B)药物在体内的磁靶向；C)铁磁、铁电和铁弹性材料的发展；D)烷基取代金属茂烯和茚二烯的性质；e)能够螯合过渡金属的稳定和持久的有机自由基的合成。SQUID磁力计对于研究材料的磁性，特别是弱磁性/小矩样品的磁性至关重要。在直流磁化测量中，测量磁矩作为施加的直流磁场（和/或温度）的函数。利用直流磁化实验，可以确定磁矩或磁滞曲线，或识别磁相变。在这种方式下，单晶样品和薄膜的完整磁性表征是可能的。这些类型的测量是必不可少的，以了解聚合物和薄膜。

With this award from the Chemistry Research Instrumentation and Facilities (CRIF) Program, the Department of Chemistry at Virginia Polytechnic Institute and State University will acquire a Superconducting Quantum Interface Device (SQUID) magnetometer. This equipment will enable researchers to carry out studies on a) synthesis and characterization of molecule-based magnets; b) magnetic targeting of drugs in vivo; c) development of ferromagnetic, ferroelectric and ferroelastic materials; d) properties of alkyl-substituted metallocenes and indacenes; and e) the synthesis of stable and persistent organic radicals that are capable of chelating transition metals. A SQUID magnetometer is critical for studying the magnetic properties of materials, particularly for weakly magnetic/small moment samples. In a DC magnetization measurement, one measures the magnetic moment as a function of applied DC magnetic field (and/or temperature). Using DC magnetization experiments, one can determine magnetic moments or a hysteresis curve, or identify magnetic phase transitions. In such a fashion, complete magnetic characterization of single crystal samples and films is possible. These types of measurements are essential in order to understand polymers and thin films.