Fig. 2: Experimental microwave absorption spectra of [Ir1Fe0.5Co0.5Pt1]20 measured by frequency and field-sweep ferromagnetic resonance techniques at room temperature.
From: Microwave resonances of magnetic skyrmions in thin film multilayers
![Fig. 2: Experimental microwave absorption spectra of [Ir1Fe0.5Co0.5Pt1]20 measured by frequency and field-sweep ferromagnetic resonance techniques at room temperature.](http://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41467-021-22220-1/MediaObjects/41467_2021_22220_Fig2_HTML.png)
a Transmission intensity S12(f, H⊥) (colour map) determined from frequency-swept S12(f) curves at a series of constant magnetic fields. Resonances (overlaid data points) are determined by Dysonian peak-fits in raw S12(f) curves (c), or Lorentzian peak-fits in interpolated S12(H⊥) curves (b). Black data points track resonances in the ferromagnetic (FM) phase. In the skyrmion phase, the high-frequency (HF) and low-frequency (LF) modes are shown in orange and pink respectively. Blue S12(f) and green S12(H⊥) curves are cuts along the blue and green dashed lines in the intensity plot. d Similar plots showing S12(f, H⊥) obtained from a separate dataset consisting of field-swept S12(H⊥) curves at a series of constant frequencies. Raw S12(H⊥) curves are shown in (e), and derived frequency-swept S12(f) curves at constant field in (f). The error bars in (a), (d) are obtained from least-square fits of raw experimental spectra. Details of the fitting procedure are included in supplementary section I.B.
