We have studied the magnetic properties of very thin PdFe films grown by molecular beam epitaxy. The behavior expected for a 2D Heisenberg system - that is a variation of the susceptibility as exp(B/T) and a logarithmic dependence of the magnetization on the applied field - is observed in a certain range of temperature and field. This is in agreement with recent results of Webb et al .
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Petroff, F., Cros, V., Fert, A. et al. Two Dimensional Magnetic Properties of PdFe Layers. MRS Online Proceedings Library 384, 259–264 (1995). https://doi.org/10.1557/PROC-384-259