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  • Title: Stacking-Dependent Spin Interactions in Pd/Fe Bilayers on Re(0001).
    Author: Li W, Paul S, von Bergmann K, Heinze S, Wiesendanger R.
    Journal: Phys Rev Lett; 2020 Nov 27; 125(22):227205. PubMed ID: 33315450.
    Abstract:
    Using spin-polarized scanning tunneling microscopy and density functional theory, we have studied the magnetic properties of Pd/Fe atomic bilayers on Re(0001). Two kinds of magnetic ground states are discovered due to different types of stacking of the Pd adlayer on Fe/Re(0001). For fcc stacking of Pd on Fe/Re(0001), it is a spin spiral propagating along the close-packed (ΓK[over ¯]) direction with a period of about 0.9 nm, driven by frustrated exchange and Dzyaloshinskii-Moriya interactions. For the hcp stacking, the four-site four-spin interaction stabilizes an up-up-down-down state propagating perpendicular to the close-packed direction (along ΓM[over ¯]) with a period of about 1.0 nm. Our work shows how higher-order exchange interactions can be tuned at interfaces.
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