Stacking-dependent spin interactions in Pd/Fe bilayers on Re(0001)

TL;DR

This study investigates how different stacking configurations in Pd/Fe bilayers on Re(0001) influence magnetic ground states, revealing distinct spin structures driven by exchange interactions and Dzyaloshinskii-Moriya effects.

Contribution

It demonstrates the stacking-dependent magnetic ground states in Pd/Fe bilayers on Re(0001), combining experimental and theoretical approaches to uncover new magnetic phenomena.

Findings

Fcc stacking leads to a spin spiral with a 0.9 nm period.

Hcp stacking stabilizes an uudd state with a 1.0 nm period.

Different stacking types result in distinct magnetic ground states.

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 direction with a period of about 0.9 nm, driven by frustrated exchange and Dzyaloshinskii-Moriya interactions. For the hcp stacking, the higher-order exchange interactions stabilize an uudd (up-up-down-down) state propagating perpendicular to the close-packed direction with a period of about 1.0 nm.