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Influence of variation of tungsten layer thickness on interfacial Dzyaloshinskii–Moriya interaction in W/CoFeB/SiO2 heterostructures

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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 Brillouin light scattering spectroscopy, we have directly measured the W-layer thickness-dependent IDMI in technologically important W(t)/CoFeB/SiO2 heterostructures in the range 1 nm ≤ t ≤ 7 nm. Due to the presence of IDMI, a pronounced asymmetry is observed in the peak intensity, frequency and linewidth of the spin-wave spectra in the Damon-Eshbach geometry. Our study reveals that IDMI energy density increases monotonically for 1 nm ≤ t ≤ 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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Acknowledgements

We acknowledge the financial assistance from the Department of Science and Technology, Government of India, under grant no. SR/NM/NS-09/2011 and S. N. Bose National Centre for Basic Sciences, under grant no. SNB/AB/18-19/211. AKC acknowledges DST, Government of India, for INSPIRE fellowship (grant no. IF150922). JS acknowledges the DST-SERB, Government of India, for support from the Ramanujan Fellowship (No. SB/S2/RJN-093/2014).

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Authors and 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

    Avinash Kumar Chaurasiya, Jaivardhan Sinha, Samiran Choudhury & Anjan Barman

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  1. Avinash Kumar Chaurasiya
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  2. Jaivardhan Sinha
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  3. Samiran Choudhury
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  4. Anjan Barman
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Correspondence to Anjan Barman.

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This article is part of the special issue on ‘Quantum materials and devices’.

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Chaurasiya, A.K., Sinha, J., Choudhury, S. et al. Influence of variation of tungsten layer thickness on interfacial Dzyaloshinskii–Moriya interaction in W/CoFeB/SiO2 heterostructures. Bull Mater Sci 44, 277 (2021). https://doi.org/10.1007/s12034-021-02589-x

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