Figure 3

(Color online) FMR spectra observed at a frequency of 13.9 GHz, (a) for the A2 Fe₆₀Al₄₀ ferromagnet surrounded by B2 Fe₆₀Al₄₀ and (b) for the freestanding A2 Fe₆₀Al₄₀ ferromagnet. (c, d) show the corresponding micromagnetic simulations of the embedded and freestanding sample, respectively. Measurements/simulations with the external field along the magnetically easy (hard) axis are shown by black solid (red dotted) lines, respectively. The insets show snapshots of (e) the quasi uniform (center) mode and (f) a standing spin wave mode using a red-white-blue colour scale, where the magnitude of the transient magnetization z-component, ± m_z; white indicates m_z = 0 and red (blue) regions possessing + (−) m_z.