Large-Scale Nanofiber Manufacturing| Well-Aligned Magnetic Cubes for High-Frequency MagneticModulation

Professor Che Renchao (Fudan University) Adv. Funct. Mater.: Well-Aligned Magnetic Cubes for High-Frequency Magnetic Modulation

Challenge: Magnetic order modulation is essential for enhancing material and device functionalities. However, precise control over magnetic orientation and positioning in nanostructures remains challenging due to magnetic self-aggregation.

Approach: Professor Che Renchao’s team (Fudan University) proposed a strategy to quantitatively adjust viscous forces on particles in electrospray streams via applied electric fields, tailoring spatial distributions by modifying kinetic energy.

Innovation 1: This universal method applies to particles of various sizes/shapes (cubes, spheres, ellipsoids, peanuts; 10nm–µm scale). Micromagnetic simulations validated nanoscale spacing of magnetic units and interactions, revealing new insights into spatial distribution-magnetic loss relationships.

Innovation 2: In Fe-3@C@Fe tubes, aligned ferromagnetic cubes exhibited:

• Multiplied saturation magnetization via exchange coupling.

• Permeability increased by two orders (especially at high frequencies).

• Heterogeneous interfaces enhanced polarization, synergistically improving electromagnetic absorption.