Development of a Cantilever Magnetometer for Pulsed Magnetic Fields

脉冲磁场悬臂磁力计的开发

• 批准号: 9704025
• 负责人: Michael Naughton
• 金额: $ 4.52万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9704025&HistoricalAwards=false
• 关键词: Development; Cantilever; Magnetometer; Pulsed; Magnetic

9704025 Naughton A highly sensitive cantilever magnetometer will be developed for use in pulsed magnetic fields. It is anticipated that this device will achieve a sensitivity of order 10-12 Am2 (10-9 emu) in fields up to 100T, thus exceeding the sensitivity of conventional detection methods by 2 to 3 orders of magnitude. The motivation for this project is the thermodynamic study of physical phenomena in the highest available magnetic fields, which are now obtained only in transient, pulsed fields of 10-2 to 1 second duration. At the present time, experiments in pulsed fields are restricted to studies of magnetotransport, magneto- optics, and magnetic susceptibility. For the latter, an inductive method is usually employed, wherein a voltage proportional to the derivative of the magnetic moment with respect to magnetic field is induced in a multi-turn coil. If one integrates this susceptibility signal AC=dm/dH, one obtains information about the magnetic moment m, with typical sensitivity to moment of 10-8 to 10-9 Am2, or 10-5 to 10-6 emu. With the successful development of a cantilever magnetometer for the pulsed field regime, a very significant improvement over this inductance method can be realized. %%% In this project, we will design, fabricate and test a variety of cantilever devices configured especially for use in long (~10-1 s) and short (~10-2 s) pulse magnetic fields. A low field pulse system will be assembled for local temporal characterization of the new devices, with full characterization taking place at the National High Magnetic Field Laboratory's Pulsed Field Facility at Los Alamos National Laboratory. If this projects succeeds, it will significantly enhance the measurement capabilities of a large and growing number of investigators working with pulsed magnetic fields, by making sensitive magnetometry an accessible technique to a variety of physical systems in fields approaching 100T. Upon successful completion of the project, t he new devices will be made available to users at the NHMFL @ LANL. It therefore has the potential to benefit many researchers in the condensed matter sciences. In addition, there is significant potential for the transfer of this technology to industry. ***

将研制一种用于脉冲磁场的高灵敏度悬臂式磁强计。预计该装置将在高达100T的磁场中实现10-12 Am2 （10-9 emu）的灵敏度，从而比传统检测方法的灵敏度高出2至3个数量级。该项目的动机是在最高可用磁场中对物理现象进行热力学研究，目前只能在持续10-2至1秒的瞬态脉冲磁场中获得。目前，脉冲场的实验仅限于磁输运、磁光学和磁化率的研究。对于后者，通常采用电感方法，其中在多匝线圈中感应出与磁矩相对于磁场的导数成比例的电压。如果对磁化率信号AC=dm/dH进行积分，就可以得到磁矩m的信息，典型的磁矩灵敏度为10-8 ~ 10-9 Am2，或10-5 ~ 10-6 emu。随着一种用于脉冲磁场的悬臂式磁强计的成功开发，可以实现对这种电感法的非常显着的改进。在这个项目中，我们将设计、制造和测试各种专门用于长（~10-1秒）和短（~10-2秒）脉冲磁场的悬臂装置。将组装一个低场脉冲系统，用于对新设备进行局部时间表征，并在洛斯阿拉莫斯国家实验室的国家高磁场实验室脉冲场设施中进行全面表征。如果这个项目成功，它将通过使敏感磁强计成为接近100T的各种物理系统的可访问技术，大大提高大量和越来越多研究脉冲磁场的研究人员的测量能力。项目成功完成后，新设备将提供给NHMFL @ LANL的用户。因此，它有可能使许多凝聚态科学的研究人员受益。此外，将这项技术转让给工业也有很大的潜力。＊＊＊