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Substrate-Controlled Magnetism: Fe Nanowires on Vicinal Cu Surfaces
D Hashemi1, M J Waters1, W Hergert2
1Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Nanomaterials (Basel, Switzerland)
|January 23, 2020
Summary
We demonstrate controlling magnetic interactions in iron nanowires on copper surfaces. This tunability, predicted by density functional theory (DFT) and Monte Carlo simulations, offers possibilities for future magnetic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- Controlling magnetic interactions at the atomic scale is crucial for developing advanced magnetic materials and devices.
- Atomic-scale nanowires offer unique magnetic properties due to quantum confinement and surface effects.
- Understanding and manipulating magnetic coupling between nanowires is a key challenge in spintronics.
Purpose of the Study:
- To present a novel approach for controlling magnetic interactions between atomic-scale iron (Fe) nanowires.
- To investigate the tunability of magnetic properties of Fe nanowires grown on vicinal copper (Cu) surfaces.
- To explore the temperature stability of magnetic configurations in these nanowire systems.
Main Methods:
- Utilizing ab initio calculations, specifically density functional theory (DFT), to determine magnetic exchange parameters.
- Extracting both intrawire and interwire magnetic exchange parameters from DFT calculations.
- Employing Monte Carlo simulations with an anisotropic Heisenberg model to study magnetic configuration stability at finite temperatures.
Main Results:
- Demonstrated the possibility to tune magnetic properties of Fe nanowires on vicinal Cu surfaces.
- Identified Ruderman-Kittel-Kasuya-Yosida-like (RKKY) oscillations in effective interwire magnetic exchange parameters as a function of Fe interwire separation.
- Predicted critical temperatures for Fe nanowires on Cu(422) and Cu(533) surfaces to be well above room temperature.
Conclusions:
- The vicinal Cu surface provides a pathway for controlling magnetic coupling between Fe nanowires.
- The findings suggest that Fe nanowires on specific Cu surfaces exhibit stable magnetic configurations at room temperature.
- This study lays the groundwork for designing and fabricating novel atomic-scale magnetic systems with tunable properties.
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