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Updated: Nov 26, 2025

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Stacking-Dependent Spin Interactions in Pd/Fe Bilayers on Re(0001).

W Li1, S Paul2, K von Bergmann1

  • 1Department of Physics, University of Hamburg, Jungiusstrasse 9-11, 20355 Hamburg, Germany.

Physical Review Letters
|December 14, 2020
PubMed
Summary
This summary is machine-generated.

Two magnetic ground states in palladium/iron bilayers on rhenium were discovered. Stacking order dictates distinct spin spiral states, revealing tunable interface magnetic interactions.

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Area of Science:

  • Condensed Matter Physics
  • Surface Science
  • Materials Science

Background:

  • Understanding interfacial magnetism is crucial for developing advanced magnetic materials and devices.
  • Atomic-scale manipulation of magnetic properties offers pathways to novel functionalities.

Purpose of the Study:

  • To investigate the magnetic ground states of palladium (Pd) overlayers on iron (Fe) atomic bilayers supported by a rhenium (Re(0001)) surface.
  • To explore the influence of different stacking configurations on magnetic properties.

Main Methods:

  • Utilizing spin-polarized scanning tunneling microscopy (SP-STM) for atomic-scale magnetic imaging.
  • Employing density functional theory (DFT) calculations to model magnetic interactions and predict ground states.

Main Results:

  • Discovery of two distinct magnetic ground states dependent on Pd adlayer stacking (fcc vs. hcp).
  • Identification of a spin spiral state (period ~0.9 nm) for fcc stacking, driven by frustrated exchange and Dzyaloshinskii-Moriya interactions.
  • Observation of an up-up-down-down magnetic state (period ~1.0 nm) for hcp stacking, stabilized by higher-order four-spin interactions.

Conclusions:

  • Stacking configuration critically controls magnetic ground states at the Pd/Fe/Re(0001) interface.
  • Demonstration of how higher-order exchange interactions can be tuned by controlling atomic arrangements at interfaces.
  • Provides fundamental insights into interfacial magnetism for future spintronic applications.