The combination of micro-resonators with spatially resolved ferromagnetic resonance

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

Research output: Contribution to journalArticleScientificpeer-review


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.
Original languageEnglish
Pages (from-to)93703
JournalReview of Scientific Instruments
Issue number9
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed


Dive into the research topics of 'The combination of micro-resonators with spatially resolved ferromagnetic resonance'. Together they form a unique fingerprint.

Cite this