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Observation of a novel ferromagnetic phase of Ho3+ in Ho/Lu superlattices

The magnetic structures of three Ho/Lu superlattices have been investigated using neutron diffraction. The low-temperature magnetic structure adopted by the Ho3+ moments is found to depend on the number nHo of atomic planes in a single block of Ho. For a sample with nH0 approximately=40 the moments form a basal-plane spiral down to the lowest temperatures investigated, whereas for two samples with nHo<or=20 a phase transition occurs from a basal-plane spiral to a structure in which the Ho3+ moments within a single block align ferromagnetically.