We have pushed the capabilities of the cluster gun technique beyond single particle fabrication as magnetic nanoparticles spontaneously self-assembled into macroscopic chains in a controlled and reproducible way. The low-kinetic energy inside a magnetron sputtering vacuum chamber and strong dipolar magnetic interaction are responsible for particles’ agglomeration at very low volume fractions.

Spontaneous in-flight assembly of magnetic nanoparticles into macroscopic chains
Lluis Balcells, Igor Stankovic, Zorica Konstantinovic,  Aanchal Alagh, Victor Fuentes, Laura López-Mir, Judit Oró, Narcis Mestres, Carlos García , Alberto Pomar, Benjamin Martínez
Nanoscale 11, 14194, 2019
DOI: 10.1039/c9nr02314c

Figure: Spontaneous self-assembly of magnetic nanoparticles into macroscopic chains by using a combination of magnetron sputtering and gas aggregation techniques

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