Interdiffusion induced exchange coupling of L10-FePd/α-Fe magnetic nanocomposites

Area of Science:

• Materials Science
• Nanotechnology
• Magnetism

Background:

• Core/shell nanoparticles offer unique properties for advanced applications.
• Controlling nanoparticle size and shell thickness is crucial for tuning magnetic characteristics.
• Developing efficient synthesis methods for magnetic nanocomposites is an ongoing research area.

Purpose of the Study:

• To report the first one-pot synthesis of FePd and FePd/Fe2O3 (core/shell) nanoparticles.
• To investigate the control over FePd particle size and Fe2O3 shell thickness.
• To explore the transformation into L10-FePd/α-Fe magnetic nanocomposites and their magnetic properties.

Main Methods:

• One-pot synthesis via interdiffusion.
• Control of nanoparticle size using ligand amount.
• Control of shell thickness using iron precursor amount.
• Reductive annealing at 500 °C to form nanocomposites.

Main Results:

• FePd/Fe2O3 core/shell nanoparticles synthesized successfully.
• FePd particle size tunable by ligand, Fe2O3 shell thickness by iron precursor.
• Annealed nanocomposites exhibit exchange-coupled L10-FePd/α-Fe structure.
• Magnetic properties, including coercivity (Hc) up to 2.4 kOe and saturation magnetization (Ms) of 141 emu/g, are tunable by Fe2O3 shell thickness.

Conclusions:

• A novel and efficient one-pot synthesis method for FePd/Fe2O3 core/shell nanoparticles is established.
• The magnetic properties of the resulting L10-FePd/α-Fe nanocomposites can be precisely tuned by controlling the Fe2O3 shell thickness.
• These findings open avenues for developing advanced magnetic materials with tailored properties.