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Polyol Process Synthesis of Monodispersed FePt Nanoparticles.
Chao Liu1, Xiaowei Wu, Timothy Klemmer
1Seagate Research, Pittsburgh, Pennsylvania 15222.
The Journal of Physical Chemistry. B
|October 28, 2008
Summary
Monodispersed iron-platinum (FePt) nanoparticles were synthesized and annealed to achieve a chemically ordered L10 phase. This transformation significantly enhanced their magnetic coercivity, showing potential for advanced magnetic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- Iron-platinum (FePt) nanoparticles are crucial for high-density magnetic storage media.
- Controlling the phase and size of FePt nanoparticles is essential for optimizing their magnetic properties.
Purpose of the Study:
- To synthesize monodispersed FePt nanoparticles using a polyol process.
- To investigate the phase transformation from a disordered to an ordered phase through annealing.
- To characterize the magnetic properties of the resulting FePt nanoparticles.
Main Methods:
- Synthesis of FePt nanoparticles via the polyol process using iron(II) and platinum(II) acetylacetonate.
- Characterization using Transmission Electron Microscopy (TEM) for size and self-assembly.
- Annealing under controlled atmosphere (Ar, <1 ppm O2) at 650°C for 30 min.
- Magnetic hysteresis measurements at 293K and 5K.
Main Results:
- Monodispersed FePt nanoparticles with an average size of 3 nm were successfully synthesized.
- Annealing induced a phase transformation from chemically disordered fcc to chemically ordered L10 phase.
- Annealed FePt nanoparticles exhibited high coercivity: 9.0 kOe at 293K and 16.7 kOe at 5K.
Conclusions:
- The polyol process is effective for producing uniform FePt nanoparticles.
- Controlled annealing is critical for achieving the high-performance L10 phase.
- The synthesized FePt nanoparticles demonstrate significant magnetic properties suitable for advanced applications.
