Related Experiment Video
Updated: Sep 4, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.2K
Magnetic ground state of supported monatomic Fe chains from first principles
B Nagyfalusi1,2, L Udvardi2,3, L Szunyogh2,3
1Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, H-1525 Budapest, Hungary.
Summary
A new computational method identifies magnetic ground states in atom clusters using first-principles calculations. This approach accurately predicts magnetic ordering for iron chains on various metal surfaces.
Area of Science:
- Condensed Matter Physics
- Computational Materials Science
- Surface Science
Background:
- Determining the ground state magnetic order of atomic clusters is crucial for understanding magnetism at the nanoscale.
- Accurate theoretical methods are needed to predict magnetic properties of low-dimensional systems.
Purpose of the Study:
- To develop and validate a novel computational scheme for identifying the magnetic ground state of finite atomic clusters.
- To investigate the magnetic properties of iron (Fe) chains on different metallic substrates using *ab initio* calculations.
Main Methods:
- A new computational scheme combining the conjugate gradient and Newton-Raphson methods for self-consistent energy minimization.
- Local spin-density functional theory (*ab initio* calculations) to determine electronic structure and magnetic order.
- Comparison with an extended Heisenberg model incorporating first-principles derived interaction parameters.
Main Results:
- The method successfully identified ground state magnetic orders for Fe chains on Rh(111), showing good agreement with Heisenberg model results.
- Analysis revealed the influence of bilinear spin-spin interactions on magnetic ground state formation.
- Spin-spiral configurations with reversed chirality were found for Fe chains on Nb(110), suggesting the role of higher-order chiral interactions.
- Calculated spin-spiral wavelengths for Fe chains on Re(0001) closely matched experimental scanning tunneling microscopy data.
Conclusions:
- The developed computational scheme is effective for predicting magnetic ground states of atomic clusters.
- The study highlights the interplay of different magnetic interactions in determining the magnetic ordering of Fe chains on surfaces.
- Results underscore the importance of considering higher-order chiral interactions for accurate magnetic modeling.
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