Field-controlled phase diagram from non-collinear magnetic Janus spheres

We show how the non-collinear magnetic arrangement of ferromagnetic Janus particles enables the construction of a rich phase diagram via static self-assembly in two dimensions.
Branched clusters of staggered chains, compact clusters, linear chains and single particles can be formed and interconverted via constant and low-frequency external magnetic fields. The magnetic anisotropy of the presented particles fundamentally adds new possibilities to controlled self-assembly