AVS 63rd International Symposium & Exhibition
    MEMS and NEMS Wednesday Sessions
       Session MN+NS-WeA

Invited Paper MN+NS-WeA8
Magnetic Resonance Spectroscopy with Torsional Optomechanics

Wednesday, November 9, 2016, 4:40 pm, Room 102B

Session: Optomechanics, Photonics, and Quantum Nanosystems
Presenter: Mark Freeman, University of Alberta and The National Institute for Nanotechnology, Canada
Correspondent: Click to Email
A broadband magnetic resonance spectrometer based on optomechanical detection will be described. Demonstrations of inductive detection of spin precession in the early 1940s launched magnetic resonance spectroscopy as a general-purpose tool. As an easily miniaturizable complement to this, a resonant AC torque on a mechanical torsion sensor is choreographed from the precessing transverse RF moment via frequency mixing and then recorded through optical interferometry.

Comprehensive electron spin resonance spectra of a single-crystal, mesoscopic yttrium iron garnet disk at room temperature will be presented to illustrate the approach. A key feature of the method is that it is broadband to DC, enabling measurements of the intricate magnetostatics of individual mesoscopic magnetic objects to be performed simultaneously with the spin resonance studies. Progress in enhancing the detection sensitivity with nanocavity optomechanics also will be reported.

Work performed in collaboration with J Losby, F Fani Sani, D Grandmont, Z Diao, M Belov, J Burgess, S Compton, W Hiebert, D Vick, T Firdous (University of Alberta and National Institute for Nanotechnology, Edmonton), M Wu, N Wu, P Barclay (University of Calgary and NINT), and K Mohammad, E Salimi, G Bridges, D Thomson (University of Manitoba, Winnipeg). We are grateful for support from NSERC, NINT, AITF, and CRC.