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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Magnetism in nanocrystalline gold
Vladimir Tuboltsev1, Alexander Savin, Alexandre Pirojenko
1Division of Materials Physics, Department of Physics, University of Helsinki, PO Box 43, FI-00014 Helsinki, Finland. vladimir.tuboltsev@helsinki.fi
Nanostructured gold exhibits unconventional magnetic properties, showing ferromagnetic-like behavior in nanocrystalline films. This behavior, consistent with theoretical predictions, bridges the gap in understanding magnetism in bare gold nanomaterials.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Bulk gold is diamagnetic.
- Emerging evidence suggests nanostructured gold possesses unique magnetic properties.
- Experimental data on magnetism in bare gold nanomaterials remains limited.
Purpose of the Study:
- Investigate magnetism in gold nanocrystalline films.
- Explore the crossover state between nanoclusters and continuous films.
- Bridge the gap in experimental studies of bare gold nanomaterial magnetism.
Main Methods:
- Fabrication of gold nanocrystalline films using cluster deposition.
- Characterization of magnetic properties, including hysteresis loops.
- Temperature-dependent magnetization measurements.
Main Results:
- Demonstrated ferromagnetic-like hysteretic magnetization in gold nanocrystalline films.
- Observed temperature dependence indicative of spin-glass-like behavior.
- Results align with theoretical predictions from first-principles calculations.
Conclusions:
- Gold nanocrystalline films exhibit unconventional magnetism.
- The observed behavior is consistent with spin-glass models.
- This study provides crucial experimental data for theoretical frameworks of nanomaterial magnetism.
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