Excimer Laser Production, Assembly, Sintering, and Fragmentation of Novel Fullerene-like Permalloy Particles in Liquid

We report the fabrication of permalloy nanoparticles by Pulsed excimer laser ablation of a permalloy (Fe19Ni81) target ill sodium dodecyl Sulfate aqueous Solution and the subsequent laser-induced assembly, sintering, and fragmentation of the nanoparticles. Specifically, permalloy nanoparticles with diameters of 400-600 nm were observed to assemble into fullerene-like hollow microparticles. Laser irradiation caused sintering Of the assembled particles, which showed Wulff construction and ledge growth behavior and finally resulted ill smooth shells. Laser-particle interactions also caused fragmentation of the micro/nanoparticles. When the particle concentration is high, laser fragmentation rather than laser ablation dominates due to enhanced light absorption and scattering. The experiments reveal the dynamic process of the nano- and microparticle formation, demonstrating the rich processing environment of laser ablation ill liquid.