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TooTallTim
mespilus
'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