The Magnetic Structures of Rare-Earth Superlattices

摘要: Rare-earth superlattices have been grown by a number of groups using molecular beam epitaxy, and the chemical magnetic structures determined with x-ray neutron-diffraction techniques. Superlattices Dy/Y, Ho/Y, Ho/Lu, Ho/Dy show helical in which moments are aligned ferromagnetic sheets within each basal plane, but orientation changes from one plane to next. The order then propagates coherently layer next coherence both turn angle chirality helix. In contrast there is no ordering Ho for Ho/Pr Pr has dhcp structure hep structure. There also Ho/Sc lattice mis-match so large that Sc layers different basal-plane constants. behaviour more complex Ho/Er, Ho/Tm, Er/Y Er/Lu coherent at temperatures where either or along c-axis when components length decreases as second component moment increases. It argued these results consistent model if conduction electrons responsible magnetism can propagate through superlattice obtained they confined particular only over single layers.