Abstract
Cr/Sb multilayered films take two types of structures - epitaxial superlattice and non-epitaxial multilayer - depending on the thickness of Cr layer ( d Cr) and substrate temperature during deposition ( T s). The epitaxial superlattices were formed when d Cr ≤ 2Å and T s = 90°C; Cr and Sb reacted into a NiAs-type compound CrSb, and furthermore deposited Sb grew epitaxially on the CrSb layer. With other deposition parameters, non-epitaxial Cr/Sb multilayers were formed, in which Cr layers are polycrystalline or amorphous-like but Sb layers are crystalline and [00.1] oriented. The reactivities of Cr/Sb interfaces greatly affect the film quality. Magnetic properties are also dependent on the degree of compound formation. The epitaxial CrSb/Sb superlattices show a ferromagnetic feature at 5 K, whereas the non-epitaxial Cr/Sb multilayers show a paramagnetic feature.
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