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Patterning of L10 FePt nanoparticles with ultra-high coercivity for bit-patterned media
Zhengong Meng1, Guijun Li2, Hon-Fai Wong2
1Institute of Molecular Functional Materials, Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P. R. China. rwywong@hkbu.edu.hk clamho@hkbu.edu.hk.
Nanoscale
|December 14, 2016
Summary
Researchers developed a one-step method to create highly magnetic L10-ordered iron-platinum (FePt) nanoparticles. These nanoparticles exhibit ultra-high coercivity, making them promising for advanced data storage applications.
Area of Science:
- Materials Science
- Nanotechnology
- Magnetism
Background:
- Developing high-performance magnetic nanoparticles is crucial for advanced data storage.
- Achieving the L10-ordered phase in iron-platinum (FePt) nanoparticles is key to high coercivity.
Purpose of the Study:
- To develop a direct, one-step synthesis method for L10-ordered FePt nanoparticles.
- To investigate the influence of synthesis atmosphere on nanoparticle properties.
- To demonstrate the potential application of these nanoparticles in bit-patterned media.
Main Methods:
- One-step pyrolysis of a novel metallopolyyne precursor.
- Synthesis under different atmospheres (Ar vs. Ar/H2).
- Characterization of chemical ordering, morphology, and magnetic properties.
- Nanoimprint lithography for application demonstration.
Main Results:
- Successfully synthesized L10-ordered FePt nanoparticles with ultra-high coercivity (up to 3.6 T).
- The presence of H2 during annealing promotes the nucleation and growth of L10-FePt NPs.
- Demonstrated feasibility for bit-patterned media applications.
Conclusions:
- A facile one-step pyrolysis method enables direct synthesis of high-coercivity L10-FePt NPs.
- Hydrogen in the annealing atmosphere is critical for optimizing L10 phase formation and NP growth.
- The synthesized FePt NPs are suitable for next-generation magnetic storage media.
