High-Performance Anisotropic Nanocomposites with a Novel Core/shell Microstructure

Area of Science:

• Materials Science
• Nanotechnology
• Magnetism

Background:

• Developing rare-earth-lean permanent magnets is crucial for next-generation technologies.
• Fabricating high-performance magnetic nanocomposites faces challenges in controlling soft phase grain size.

Purpose of the Study:

• To synthesize anisotropic SmCo5@FeCo nanocomposites using a novel surfactant-assisted low-temperature chemical coating (LTCC) method.
• To enhance the magnetic properties of SmCo5-based materials for ultrastrong permanent magnets.

Main Methods:

• Utilized surfactant-assisted low-temperature chemical coating (LTCC) to create SmCo5@FeCo nanocomposites.
• Achieved uniform coating of 5-15 nm FeCo soft phase particles on SmCo5 hard phase.

Main Results:

• Fabricated optimal anisotropic SmCo5@FeCo nanocomposites with 15 wt% soft phase coating.
• Attained high coercivity (Hc) of 17.2 kOe and energy product ((BH)max) of 29.4 MGOe.
• Demonstrated a 31% enhancement in energy product compared to uncoated SmCo5.

Conclusions:

• The enhanced performance is attributed to nanosized grains and a high remanence ratio (Mr/Ms) of 0.976.
• The LTCC method offers a promising route for synthesizing stronger bulk nanocomposite magnetic systems.
• These findings represent a significant advancement toward cost-effective, high-performance permanent magnets.