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<p>Recent results show remarkable interfacial-Dzyaloshinskii-Moriya interaction (i-DMI) effect in magnetic heterostructures composed of relatively thick Fe thin films (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\gg 1\, \text {nm}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>≫</mo> <mn>1</mn> <mspace width="0.166667em" /> <mtext>nm</mtext> </mrow> </math></EquationSource> </InlineEquation>). To investigate its origin, we present a thorough magnetic characterization of the SiO<sub>2</sub>/<sup>57</sup>Fe(t)/Au and SiO<sub>2</sub>/Pt/<sup>57</sup>Fe(t)/Au heterostructures (t = 1.6–2.2&#xa0;nm). An i-DMI constant <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({D}_{s}^{Pt}=0.43\pm 0.02 \ {\text{mJ}/\text{m}}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msubsup> <mi>D</mi> <mrow> <mi>s</mi> </mrow> <mrow> <mi mathvariant="italic">Pt</mi> </mrow> </msubsup> <mo>=</mo> <mn>0.43</mn> <mo>±</mo> <mn>0.02</mn> <mspace width="4pt" /> <msup> <mrow> <mtext>mJ</mtext> <mo stretchy="false">/</mo> <mtext>m</mtext> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> 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.</p> Graphic Abstract <p></p>

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Atomic-scale origin of interfacial Dzyaloshinskii–Moriya interaction in Pt/Fe/Au

  • 期刊论文

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  • 发表日期：

    2026年2月17日

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  • Emanuele Longo,
  • Gianluca Gubbiotti,
  • Matteo Belli,
  • Claudia Wiemer,
  • Mario Alia,
  • Marco Fanciulli,
  • Roberto Mantovan

摘要

Recent results show remarkable interfacial-Dzyaloshinskii-Moriya interaction (i-DMI) effect in magnetic heterostructures composed of relatively thick Fe thin films ( \(\gg 1\, \text {nm}\) ≫ 1 nm ). 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 \({D}_{s}^{Pt}=0.43\pm 0.02 \ {\text{mJ}/\text{m}}^{2}\) 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