Articles written in Bulletin of Materials Science

    • Influence of variation of tungsten layer thickness on interfacial Dzyaloshinskii–Moriya interaction in W/CoFeB/SiO$_2$ heterostructures


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      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.

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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      Posted on July 25, 2019

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