10月17日到10月18日，来自德国斯图加特大学的Petr Neugebauer博士来访并作报告，与我们组内同学交流。

报告题目：THz spectroscopy for investigation of electronic and magnetic properties

报告摘要：Electron Spin Resonance (ESR) is a powerful technique to investigate electronic and magnetic properties of materials used in molecular spintronics. Performing the experiments at THz frequencies is of great interest due to capability to investigate molecular systems with a large magnetic anisotropy and a large spectral resolution, which is not possible by conventional methods. We will present the recently developed combined High Frequency Field and Frequency Domain THz Electron Spin Resonance (HFESR/FDMR) spectrometer capable to investigate for the first time electronic and magnetic properties of molecular systems, thin films and bulk materials in the very broad frequency range of 85-1100 GHz. The HFEPR/FDMR spectrometer operates at high magnetic fields up to 17 T and temperatures from 300 K down to 1.8 K. For the microwave radiation an amplifier multiplier chain is used which gaplessly covers the frequency range. A quasi-optical bridge in combination with corrugated waveguides guarantees the propagation of the microwave with only minimal losses, where special care was given to eliminate any standing waves in the system. For very sensitive measurements we developed a tunable Fabry-Pérot resonator, which allows a sensitivity of only 107 spins/Gauss. Furthermore, samples can be oriented with respect to the applied magnetic field by using single crystal rotator. The performance of the spectrometer will be demonstrated on molecular systems, thin films and bulk materials.

Petr Neugebauer博士做报告

Petr Neugebauer博士与学生交流