Ferromagnetism of ultrathin films.
- Author(s): Bander, M
- Mills, DL
- et al.
Published Web Locationhttps://doi.org/10.1103/physrevb.38.12015
We discuss the nature of ferromagnetism in ultrathin films of magnetic ions, here regarded as two-dimensional Heisenberg ferromagnets subject to uniaxial anisotropy with the easy axis normal to the film. We show that a phase transition to ferromagnetism occurs always for arbitrarily small anisotropy. Renormalization-group scaling relations for the transition temperature and the temperature variation of the correlation length are obtained. Implications of these results are discussed. © 1988 The American Physical Society.