Large Dzyaloshinskii-Moriya interaction and atomic layer thickness dependence in a ferromagnet-WS.sub.2./sub. heterostructure

0567863 - FZÚ 2023 RIV US eng J - Journal Article
Husain, S. - Pal, S. - Chen, X. - Kumar, Prabhat - Kumar, A. - Mondal, A.K. - Behera, N. - Gupta, N.K. - Hait, S. - Gupta, R. - Brucas, R. - Sanyal, B. - Barman, A. - Chaudhary, S. - Svedlindh, P.
Large Dzyaloshinskii-Moriya interaction and atomic layer thickness dependence in a ferromagnet-WS₂ heterostructure.
Physical Review B. Roč. 105, č. 6 (2022), č. článku 064422. ISSN 2469-9950. E-ISSN 2469-9969
Institutional support: RVO:68378271
Keywords : large Dzyaloshinskii-Moriya * ferromagnet * WS₂ * heterostructure
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.105.064422

Two-dimensional transition metal dichalcogenides (TMDs) have immense potential for spintronics applications. Here, we report atomic layer thickness dependence in WS2/Co3FeB heterostructures. The layer dependence is predicted by density functional theory and demonstrated experimentally by the layer dependence of the Dzyaloshinskii-Moriya interaction (DMI). Notably, we have observed the DMI in WS2 to be larger than that for heavy metals such as W and Ta, which is important to stabilize chiral structures. Inversion symmetry is not preserved with an odd number of layers, while it exists with an even number of layers. This symmetry rule is reflected in the temperature dependence of the effective damping parameter of the heterostructure. This suggests that the layer dependence has its origin at the WS2 interface, where the spin-valley coupling and spin-orbit coupling activate these features.

Permanent Link: https://hdl.handle.net/11104/0339119