Rare-earth metals: Is gadolinium really ferromagnetic?

@article{Coey1999RareearthMI,
  title={Rare-earth metals: Is gadolinium really ferromagnetic?},
  author={John Michael David Coey and V. Skumryev and K. Gallagher},
  journal={Nature},
  year={1999},
  volume={401},
  pages={35-36}
}
Gadolinium is accepted to be one of the four ferromagnetic elements, along with iron, cobalt and nickel, although its Curie point, TC (the temperature above which ferromagnetism is lost), is only 292 K. Ferro-magnets exhibit a characteristic divergence of their susceptibility at TC, but no such divergence in any direction is found for needle-shaped crystals of gadolinium. Instead, the susceptibility diverges at a lower spin-reorientation temperature, Tsr, of 225 K, where the anisotropy changes… 
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