Acquisition of a Vibration Sample Magnetometer

该奖项为获得最先进的振动样品磁力计（VSM）提供支持，该磁力计将由特拉华大学物理、天文、化学和生物化学系在新型磁性材料领域的多个互补和跨学科研究项目共享。该仪器将提供10-6鸸鹋水平的灵敏度，用于90 kOe和4 K至1000 K之间的直流测量，灵敏度约为10- 7鸸鹋水平，用于100 Oe范围内的交流测量。目前的研究项目将立即受益于进入这样的设施：1)三层隧道结的自旋极化输运研究，2)纳米结构材料的磁致伸缩研究，3)永磁体和小磁性颗粒的研究，以及4)新型铁磁气凝胶和磁性气凝胶基纳米复合材料的磁性研究。这些项目从基础材料、物理和化学以及潜在的设备应用的角度来解决重要的问题。在所有这些研究中，具有高、低温高、低场测量能力的高灵敏度、变频VSM磁强计势在必行。这里提出的VSM代表了实现尽可能广泛的研究目标的最具成本效益的方法。特拉华大学将提供50%的费用分摊。NSF的适度投资将对我们的研究产生重大影响，并使大量学生受益。*** 2

9704246 Xiao This award provides support for the acquisition of a state-of-the- art vibrating sample magnetometer (VSM) to be shared by a number of complementary and interdisciplinary research programs in the area of novel magnetic materials in the Departments of Physics and Astronomy and Chemistry and Biochemistry at the University of Delaware. The instrument will provide sensitivity at the level of 10-6 emu for DC measurements in fields to 90 kOe and temperatures between 4 K and 1000 K, and sensitivity at the level of about 10- 7 emu for AC measurements in fields to 100 Oe. Current research programs that will immediately benefit from access to such a facility include: l) studies of spin polarized transport in trilayer tunneling junctions, 2) studies of magnetostriction in nanostructured materials, 3) studies of permanent magnets and small magnetic particles, and 4) studies of the magnetic properties of novel ferromagnetic aerogels and magnetic aerogel- based nanocomposites. %%% These programs address issues of importance from the standpoint of fundamental materials physics and chemistry, as well as potential device applications. In all these studies, a high sensitivity, variable frequency VSM magnetometer with high and low field measurement capabilities at high and low temperatures is imperative. The VSM proposed here represents the most cost effective way to accomplish the widest possible range of research objectives. The University of Delaware will provide a 50% cost sharing. The moderate investment by NSF will have a major impact on our research and benefit a large number of students. *** 2