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Thin epitaxial films of Tb metal were grown on a clean W(110) substrate inultra-high vacuum and studied in-situ by low-energy electron microscopy.Annealed films present magnetic contrast in spin-polarized low-energy electronmicroscopy. The energy dependence of the electron reflectivity was determinedand a maximum value of its spin asymmetry of about 1\% was measured. Themagnetization direction of the Tb films is in-plane. Upon raising thetemperature, no change in the domain distribution is observed, while theasymmetry in the electron reflectivity decreases when approaching the criticaltemperature, following a power law $ \sim (1 - T/T_C)^\beta$ with a criticalexponent $\beta$ of 0.39.

Magnetism of epitaxial Tb films on W(110) studied by spin-polarized low-energy electron microscopy