Being "silent" means these molecules don't interfere with their neighbors, allowing them to be packed much more densely in a storage device than traditional magnets.
Though they ignore magnetic fields, they can still interact with charge and spin currents, meaning we can potentially flip their states using only electricity. The Blueprint: Synthetic Strategies Single Molecule Toroics: Synthetic Strategies, ...
The surrounding organic molecules (ligands) must be perfectly positioned to force the metal ions' spins into that crucial head-to-tail alignment. Being "silent" means these molecules don't interfere with