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'The magnetic hysteresis observed below 4K was attributed to the magnetic coupling of the unpaired d-electron spins on each of the transition metal ions and the large energy barrier to changing spin produced by the ligand environment.'
and
'Magnetic anisotropy describes whether a molecule has an intrinsically preferred direction for how spins line up in a magnetic field.'tldr: a better description of a magnet
Move out of the way blacksmiths/metalbashers,
Chemistry is here to advance magnet technology:
https://www.chemistryworld.com/features/reaching-the-molecular-limit-of-magnetic-memory/4013778.article