The combination of micro-resonators with spatially resolved ferromagnetic resonance

Tutkimustuotos: Lehtiartikkelivertaisarvioitu


  • T. Schaffers
  • R. Meckenstock
  • D. Spoddig
  • T. Feggeler
  • K. Ollefs
  • C. Schöppner
  • S. Bonetti
  • H. Ohldag
  • M. Farle
  • A. Ney


  • Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstr. 1,, 47057 Duisburg, Germany
  • Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Altenberger Str. 69, 4040 Linz, Austria
  • Johannes Kepler University of Linz
  • University of Duisburg-Essen


We present two new and complementary approaches to realize spatial resolution for ferromagnetic resonance (FMR) on the 100 nm-scale. Both experimental setups utilize lithographically fabricated micro-resonators. They offer a detection sensitivity that is increased by four orders of magnitude compared with resonator-based FMR. In the first setup, the magnetic properties are thermally modulated via the thermal near-field effect generated by the thermal probe of an atomic force microscope. In combination with lock-in detection of the absorbed microwave power in the micro-resonator, a spatial resolution of less than 100 nm is achieved. The second setup is a combination of a micro-resonator with a scanning transmission x-ray microscope (STXM). Here a conventional FMR is excited by the micro-resonator while focused x-rays are used for a time-resolved snap-shot detection of the FMR excitations via the x-ray magnetic circular dichroism effect. This technique allows a lateral resolution of nominally 35 nm given by the STXM. Both experimental setups combine the advantage of low-power FMR excitation in the linear regime with high spatial resolution to study single and coupled nanomagnets. As proof-of-principle experiments, two perpendicular magnetic micro-stripes (5 μ m × 1 μ m) were grown and their FMR excitations were investigated using both setups.


JulkaisuReview of Scientific Instruments
TilaJulkaistu - 2017
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 36878130