Abstract
The magnetic structures of an Er (90 A)/Tb (10 A) superlattice with the c-axis of the hcp structure parallel to the growth direction are investigated by neutron diffraction. As a function of temperature, the magnetic component parallel to the c-axis undergoes the same sequence including the Neel and Curie temperatures as bulk Er, while the component in the basal plane retains a helical ordering at higher temperatures up to 130 K, which is more than twice the corresponding temperature of bulk Er. We argue that the basal-plane ferromagnetic ordering of the adjacent Tb layers has enhanced the development of the basal-plane ordering in the Er layers.
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