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    • Keywords


      Interfacial Dzyaloshinskii–Moriya interaction; Brillouin light scattering; asymmetric spin-wave dispersion; structural phase transition.

    • Abstract


      Interfacial Dzyaloshinskii–Moriya interaction (IDMI) is crucial for stabilizing skyrmions and chiral domain walls, which are expected to play key roles in the development of advanced spintronics-based devices. Using Brillouinlight scattering spectroscopy, we have directly measured the W-layer thickness-dependent IDMI in technologically important W(t)/CoFeB/SiO$_2$ heterostructures in the range 1 nm ${\le}$ t ${\le}$ 7 nm. Due to the presence of IDMI, a pronounced asymmetry is observed in the peak intensity, frequency and line width of the spin-wave spectra in the Damon-Eshbach geometry. Our study reveals that IDMI energy density increases monotonically for 1 nm ${\le}$ t ${\le}$ 5 nm, beyond which it decreases sharply, while its sign always remains negative. This remarkable variation of IDMI energy density is explained in the light of the thickness-dependent structural phase transition of W.

    • Author Affiliations



      1. Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Sector III, Salt Lake, Kolkata 700106, India
    • Dates

  • Bulletin of Materials Science | News

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