Fig. 1: Characteristic OSTFMR measurement.
a Schematic illustration of charge and spin transport mechanisms in Fe3Sn2: spin-polarized electric currents responsible for STT, SOC-based bulk and interfacial SHE, THE induced by \(k\)-space band topology emerging from spin-chirality, and THE induced by real-space topology of localized spin structures. b Crystal structure of Fe3Sn2. c SEM image of the Fe3Sn2 crystal together with a schematic of the experimental technique. RF currents are driven through the crystal and excite the skyrmion resonance. \({m}_{z}\) is detected in a polar-MOKE configuration using a phase-locked femtosecond laser. d OSTFMR trace of \({m}_{z}(t,\,{H}_{0})\) at \(14\,{GHz}\). Black dashed line indicates \(\phi\) vs. \({H}_{0}\). e Measured amplitude response \(|{m}_{z}\,({H}_{0})|\) (green open circles) together with the two fitted modes (red and blue dashed lines) and the reconstructed response (green solid line). f Extracted \({H}_{{res}}\) at \(10\,{GHz}\) for different values of \({J}_{c}\). \({J}_{c}\) was estimated using the Poisson equation while accounting for the geometrical dimensions of the crystal (details in Supplementary Note 2). In (d, e) \({m}_{z}\) was normalized to its peak value.
