Pushing the limits of torque-detected electron-spin resonance

这一跨学科项目旨在开发和应用一种基于扭矩磁力检测的高灵敏度、宽带、高频电子自旋共振谱仪。从我们最近的前期工作开始，我们将首先扩大扭矩检测ESR的适用范围，并对光谱仪和测量方案进行优化。零偏测量能力的实施将增加动态范围，而软悬臂和替代检测方案将提高灵敏度。这将使我们能够在高频下对自旋数量有限的“现实生活”样品进行高度灵敏的频率、场和角度相关测量。这些样品包括自旋中心的表面阵列，以及金属蛋白活性中心中的高自旋、高各向异性中心。

This interdisciplinary project aims to develop and employ a highly sensitive, broadband, highfrequency electron spin resonance spectrometer based on torque magnetometric detection. Starting from our recent preliminary work, we will first extend the applicability of torque-detected ESR, and optimize the spectrometer as well as the measurement protocol. The implementation of zero-deflection measurement capabilities will increase the dynamic range, while soft cantilevers and alternative detection schemes improve the sensitivity. This will enable us to carry out highly sensitive frequency-, field-, and angle-dependent measurements at high-frequencies on “real life” samples with limited numbers of spins. These samples include surface arrays of spin centers, and high-spin, high-anisotropy centers in the active sites of metalloproteins.