Abstract Recent results show remarkable interfacial-Dzyaloshinskii-Moriya interaction (i-DMI) effect in magnetic heterostructures composed of relatively thick Fe thin films (1\, nm ≫ 1 nm). To investigate its origin, we present a thorough magnetic characterization of the SiO 2 / 57 Fe (t) /Au and SiO 2 /Pt/ 57 Fe (t) /Au heterostructures (t = 1. 6–2. 2 nm). An i-DMI constant Dₒ^Pt=0. 43 0. 02 \ mJ/m^2 D s Pt = 0. 43 ± 0. 02 mJ / m 2 is extracted for the Pt/Fe/Au system, as probed by wavevector-resolved Brillouin light scattering spectroscopy. Ferromagnetic resonance and conversion electron Mössbauer spectroscopy provide evidence that significant surface anisotropy is present in Pt/Fe/Au and an interfacial Fe fraction (~ 18%) exhibits tilted magnetization (~ 25° out of plane) and enhanced hyperfine field, correlating with the stronger i-DMI. Graphic Abstract
Longo et al. (Tue,) studied this question.