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29 Sep 1986

Volume 49, Issue 13, pp. 749-830

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Effect of ion bombardment on the surface magnetism of Fe3O4

M. Aeschlimann, G. L. Bona, F. Meier, M. Stampanoni, G. Zampieri, and H. C. Siegmann

Appl. Phys. Lett. 49, 824 (1986); http://dx.doi.org/10.1063/1.97506 (2 pages) | Cited 9 times

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We have found that ion bombardment produces dramatic changes in the surface magnetism of Fe3O4. The surface layer with irregular magnetic behavior is more than 50 Å thick. These findings are of importance for current studies of ferritelike sputtered thin films as well as magnetic alloys in general.
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81.40.Rs Electrical and magnetic properties related to treatment conditions
75.50.Gg Ferrimagnetics
75.70.-i Magnetic properties of thin films, surfaces, and interfaces
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces

Novel laser induced image storage by chemical modification of surfaces in in situ textured amorphous Ge films

L. Kameswara Rao, K. Solomon Harshavardhan, A. Selvarajan, and M. S. Hegde

Appl. Phys. Lett. 49, 826 (1986); http://dx.doi.org/10.1063/1.97507 (3 pages) | Cited 3 times

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A novel high contrast laser imaging based on chemical modification of the surfaces has been demonstrated in textured amorphous films of Ge. The process of imaging has been studied by x‐ray initiated Auger electron spectroscopy, x‐ray photoelectron spectroscopy, transmission electron microscopy, and microdensitometry. Laser irradiation transforms amorphous Ge and amorphous GeO phases to crystalline Ge and GeO phases, the GeO phase growing at the cost of the Ge phase. This leads to imaging, the contrast of which can be enhanced by annealing in air at 525 °C. Photoenhanced chemical modification of the surfaces with concomitant topological rearrangments of the irradiated network has been suggested as the phenomenon responsible for imaging in these films. Such chemical modification of the surfaces has a large potential in high‐resolution high‐contrast laser imaging.
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68.35.B- Structure of clean surfaces (and surface reconstruction)
81.65.-b Surface treatments
42.30.Va Image forming and processing
68.55.-a Thin film structure and morphology

Function of cobalt and platinum on p‐InP in the photoevolution of hydrogen from alkaline solutions

C. E. Goodman and B. W. Wessels

Appl. Phys. Lett. 49, 829 (1986); http://dx.doi.org/10.1063/1.97508 (2 pages)

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The role of metal deposits (e.g., Co and Pt) on p‐InP photocathodes in the photoevolution of hydrogen from alkaline solutions was studied. The deposition of Co or Pt on a p‐InP photocathode was found to increase the solar‐to‐chemical efficiency by more than an order of magnitude. Photocurrent‐voltage curves before and after metal deposition have shown that the open‐circuit voltage remains nearly constant at 0.65–0.77 V. Under a reverse bias of 0.1–0.6 V the presence of metal islands has a large effect on cell performance by improving the short‐circuit current and fill factor. This indicates that the deposited metals act as classical catalysts on photocathodes in alkaline hydrogen generating photoelectrochemical cells.
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81.40.Rs Electrical and magnetic properties related to treatment conditions
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
72.40.+w Photoconduction and photovoltaic effects
82.47.-a Applied electrochemistry
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