Related Experiment Video
Updated: Jun 23, 2026
07:40
Production of Metal Nanoparticles by Pulsed Laser-ablation in Liquids: A Tool for Studying the Antibacterial Properties of Nanoparticles
Published on: June 2, 2017
FePt nanoparticles fabricated by pulsed laser ablation.
K Kawaguchi1, R Wu, Y Ishikawa
1Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
Journal of Nanoscience and Nanotechnology
|May 16, 2009
Summary
Two laser processes fabricated iron-platinum (FePt) nanoparticles. Low vacuum processing yielded superparamagnetic FePt nanoparticles with high coercivity after annealing, demonstrating potential for magnetic storage applications.
Area of Science:
- Materials Science
- Nanotechnology
- Physics
Background:
- Iron-platinum (FePt) nanoparticles are crucial for high-density magnetic storage media due to their magnetic properties.
- Fabrication methods influence nanoparticle structure and magnetic behavior.
- Controlling phase transformation and composition is key for optimizing FePt performance.
Purpose of the Study:
- To investigate two novel laser-based fabrication methods for FePt nanoparticles: PLA in low vacuum (PLALV) and PLA in liquid (PLAL).
- To analyze the structural and magnetic properties of the fabricated FePt nanoparticles.
- To understand the annealing-induced transformation from face-centered cubic (fcc) to face-centered tetragonal (fct) structure and its effect on coercivity.
Main Methods:
- Fabrication of FePt nanoparticles using PLALV and PLAL laser processes.
- Structural characterization using X-ray diffraction (XRD) to determine crystal structure (fcc and fct phases).
- Magnetic property measurements, including coercivity (Hc) at various temperatures.
- Investigation of annealing temperature effects on structural and magnetic properties.
- Suppression of composition deviation in PLAL using Argon (Ar) bubbling.
Main Results:
- PLALV-fabricated FePt nanoparticles exhibited superparamagnetic behavior and an fcc structure as-prepared.
- Annealing promoted the transformation from fcc to fct structure, significantly increasing coercivity.
- A high coercivity of 3.6 kOe at 300 K was achieved through low-temperature (500°C) annealing.
- Argon bubbling effectively suppressed iron dissolution, mitigating composition deviation in the PLAL process.
Conclusions:
- Both PLALV and PLAL are viable methods for FePt nanoparticle fabrication.
- Low-temperature annealing of PLALV-processed FePt nanoparticles is an effective strategy to achieve high coercivity.
- PLAL process modifications, such as Ar bubbling, can control composition and prevent detrimental Fe dissolution.
