Microscopic Characterization of the L10-FePt Nanoparticles Synthesized by the SiO2-Nanoreactor Method

TL;DR

This study uses Moessbauer spectroscopy to analyze the magnetic properties of 6.5 nm L10-FePt nanoparticles synthesized via the SiO2-nanoreactor method, revealing their structural similarity to bulk alloy.

Contribution

It provides microscopic evidence that small L10-FePt nanoparticles have bulk-like structural properties, advancing understanding of nanoparticle synthesis.

Findings

Nanoparticles have bulk-like Moessbauer hyperfine parameters.

L10 structure is well-defined despite small size.

Nanoparticles exhibit similar magnetic properties to bulk alloy.

Abstract

We investigated magnetic properties of the L10-FePt nanoparticles synthesized by the SiO2-nanoreactor method by means of Moessbauer spectroscopy from the microscopic point of view. Almost all of the nanoparticles were revealed to have nearly the same Moessbauer hyperfine parameters as those of the bulk L10-FePt alloy, indicating that they have well-defined L10 structure equivalent to the bulk state in spite of their small size of 6.5 nm.