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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Semi-Magic Fe15-: A Magnetic Superatom with Unique Stability and Anisotropic Strong Ferromagnetism
Shiquan Lin1,2, Lijun Geng1, Qiuying Du1
1Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Nano Letters
|April 3, 2026
Summary
Researchers discovered that the Fe15- cluster exhibits remarkable inertness and stability. This finding is crucial for developing advanced spintronics and high-density data storage solutions.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Miniaturizing ferromagnetic materials is essential for spintronics and high-density data storage.
- Subnanoscale magnetic materials face challenges like superparamagnetic effects and stability issues.
Purpose of the Study:
- To investigate the gas-surface reactions of pure iron (Fe) clusters.
- To identify stable and magnetic subnanoscale iron clusters for potential applications.
Main Methods:
- Preparation and reaction studies of pure iron (Fe) clusters with common gases.
- Density Functional Theory (DFT) calculations to analyze cluster structure and electronic properties.
Main Results:
- Reactions showed significant size dependence, with Fe13- to Fe18- clusters being particularly noteworthy.
- The Fe15- cluster demonstrated exceptional inertness to gas collisions.
- Fe15- possesses a D6d-symmetric structure, high-spin ground state, and a "semi-magic" valence electron count (1S2|2S2|1P6|2P6||1D5|3S1).
- Fe15- exhibits a high magnetic moment (up to 50 μB) and magnetic anisotropy energy (up to 1.8 meV).
Conclusions:
- Spin accommodation plays a vital role in stabilizing magnetic superatoms.
- The Fe15- cluster's unique electronic structure confers exceptional stability and ferromagnetism.
- These findings offer a pathway for designing anisotropic magnetic subnanoparticles for spintronics and data storage.
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