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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
Published on: August 28, 2018
Engineering of FePt nanoparticles by e-beam co-evaporation
L Castaldi1, K Giannakopoulos, A Travlos
1IMS, NCSR 'Demokritos', Agia Paraskevi, Attiki, 153 10, Greece.
Nanotechnology
|July 29, 2009
Summary
Fe(50)Pt(50) nanoparticles were synthesized, showing that higher crystallization temperatures and thicknesses yield ordered phases with increased coercivity. These findings are crucial for developing advanced magnetic materials.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Fe(50)Pt(50) nanoparticles are promising for magnetic applications.
- Controlling nanoparticle morphology and phase is key to tuning magnetic properties.
Purpose of the Study:
- To investigate the effect of deposition temperature and thickness on the structural and magnetic properties of Fe(50)Pt(50) nanoparticles.
- To correlate the crystalline phase with magnetic coercivity.
Main Methods:
- Electron-beam co-evaporation of Fe and Pt onto Si substrates at varying temperatures (300-700 °C).
- Characterization of nanoparticle morphology, size (3-45 nm), and crystalline phase (face-centered tetragonal vs. cubic).
- Measurement of magnetic properties, specifically coercivity.
Main Results:
- Nanoparticle morphology varied from drop-like to continuous films with increasing temperature and thickness.
- Higher substrate temperatures and nominal thicknesses promoted the formation of the ordered face-centered tetragonal (fct) phase.
- Increased fct phase proportion correlated with higher coercivity, reaching ~10.3 kOe.
- Samples with a dominant cubic phase were superparamagnetic or soft ferromagnetic.
Conclusions:
- Fe(50)Pt(50) nanoparticle properties are highly tunable via deposition conditions.
- Optimizing growth parameters is essential for achieving high coercivity in these nanomaterials.
- Further annealing studies confirmed structural transformation and magnetic hardening potential.
