Recent results show remarkable interfacial-Dzyaloshinskii-Moriya interaction (i-DMI) effect in magnetic heterostructures composed of relatively thick Fe thin films (≫1nm). To investigate its origin, we present a thorough magnetic characterization of the SiO2/57Fe(t)/Au and SiO2/Pt/57Fe(t)/Au heterostructures (t = 1.6–2.2 nm). An i-DMI constant DsPt=0.43±0.02mJ/m2 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.
Atomic-scale origin of interfacial Dzyaloshinskii–Moriya interaction in Pt/Fe/Au
Emanuele Longo;Gianluca Gubbiotti;Matteo Belli;Claudia Wiemer;Mario Alia;Marco Fanciulli;Roberto Mantovan
2026
Abstract
Recent results show remarkable interfacial-Dzyaloshinskii-Moriya interaction (i-DMI) effect in magnetic heterostructures composed of relatively thick Fe thin films (≫1nm). To investigate its origin, we present a thorough magnetic characterization of the SiO2/57Fe(t)/Au and SiO2/Pt/57Fe(t)/Au heterostructures (t = 1.6–2.2 nm). An i-DMI constant DsPt=0.43±0.02mJ/m2 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
