Exchange-Coupling Interaction in Zero- and One-Dimensional Sm₂Co₁₇/FeCo Core-Shell Nanomagnets

Area of Science:

• Materials Science
• Nanotechnology
• Magnetism

Background:

• Rare-earth-based core-shell spring nanomagnets are crucial for the permanent magnet industry.
• Zero-dimensional (0-D) magnetic nanoparticles suffer from agglomeration, hindering practical applications and magnetic performance due to poor exchange-coupling interactions.

Purpose of the Study:

• To overcome the structural limitations of 0-D nanomagnets.
• To develop a novel one-dimensional (1-D) SmCo/FeCo core-shell nanomagnet structure.
• To improve magnetic performance by enhancing exchange-coupling interactions and reducing self-aggregation.

Main Methods:

• A combination of electrospinning and electroless plating processes was employed.
• Nanoscale SmCo was coated with an FeCo layer of tailored thickness.
• The influence of electroless plating time on fiber microstructure was investigated.

Main Results:

• A well-dispersed 1-D SmCo/FeCo core-shell nanomagnet structure was successfully prepared.
• The 1-D structure exhibited a potent exchange-coupling effect, superior to its 0-D counterpart.
• A remarkable enhancement in maximum energy product ((BH)max) of over 45.7% was achieved.
• Self-aggregation was effectively reduced in the 1-D nanomagnets.

Conclusions:

• The novel 1-D SmCo/FeCo spring nanomagnet structure overcomes the limitations of traditional core-shell nanomagnets.
• This advancement signifies a new era for the exchange-spring magnet industry.
• The improved magnetic performance and reduced aggregation offer significant potential for practical applications.