title: Torque detected broad band electron spin resonance.
abstract: We present a novel technique to measure high frequency electron spin resonance spectra in a broad frequency range (30-1440 GHz) with high sensitivity. We use a quasioptical setup with tunable frequency sources to induce magnetic resonance transitions. These transitions are detected by measuring the change in the magnetic torque signal by means of cantilever torque magnetometry. The setup allows tuning of the frequency, magnetic field, polarization, and the angle between the sample and the external magnetic field. We demonstrate the capabilities of this technique by showing preliminary results obtained on a single crystal of an Fe(4) molecular nanomagnet.
authors.affiliation: 1. Physikalisches Institut, Universität Stuttgart, Stuttgart 70550, Germany. f.hallak@ucl.ac.uk
authors.forename: Fadi
authors.initials: F
authors.lastname: El Hallak
authors.forename: Joris
authors.initials: J
authors.lastname: van Slageren
authors.forename: Martin
authors.initials: M
authors.lastname: Dressel
mesh_terms: D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D006358:Hot Temperature; D007501:Iron / Q000737:chemistry; D008280:Magnetics; D008872:Microwaves; D012399:Rotation; D019415:Torque
chemical_list: D007501:Iron