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Stabilization of unusual spin-orbit driven magnetic orderings are achievedfor chains of Mn atoms deposited on a W(110) substrate. First-principleselectronic structure calculations show that the ground state spin configurationis non-collinear, forming chiral spiral-like structures, driven by competingnearest and next-nearest neighbor interactions. The orbital magnetic momentsare also found to exhibit non-collinear ordering that, interestingly, tend toalign in-plane for some systems with an orientation distinctly differently fromthat of the spin moment. We analyse the mechanism behind such behaviour, andfind that it is due to the competition between the spin-orbit interaction andcrystal-field splitting. Model calculations based on this assumption reproducethe main findings observed in our first-principles calculations.

Chiral Spin and Orbital Angular Momentum Textures in Mn Chains on W(110): Interplay of Spin-Orbit Coupling and Crystal Field Effects