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Photographs of two identical films on a sapphire substrate: 200 nm of Mg2Ni capped by 5 nm of Pd. On the left the view is through the substrate; on the right we see the Pd layer. Initially, both sides are reflective (a). Upon exposure to hydrogen, the Mg2Ni film forms a black absorbing state [(b), left side]. This switching is reversible and has possible applications to, e.g., smart coatings in solar collectors. [W. Lohstroh, R. J. Westerwaal, B. Noheda, S. Enache, I. A. Giebels, B. Dam, and R. Griessen, Phys. Rev. Lett. 93, 197404 (2004)] |
