Strong interfacial magnetoelastic stress in holmium - lutetium (0001) superlattices

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Abstract
The saturation magnetoelastic stress (MS), , breaking the basal plane cylindrical symmetry of the hexagonal structure, has been measured for the series of superlattices (n = 8 to 85 atomic planes, with separation c/2). The MS was directly measured using a low-temperature cantilever technique. The Ho block MSs in the superlattices are larger than in an Ho film of Å thickness and in bulk Ho. An analysis accounting for the contributions to coming from: the volume, , the interface, with magnetoelastic parameter , and the epitaxial strain shows that the interfacial magnetoelastic stress is strong, up to about six times larger than for n = 8, and of the opposite sign.