Abstract
Cobalt was deposited in ultra-high vacuum (10 −7 to 10 −8 torr) onto nickel surfaces prepared inside the vacuum chamber. A shutter was positioned between source and substrate so that cobalt deposits in which there were thickness gradients were obtained. Examination of the thin cobalt films while they were attached to their nickel substrates revealed that they were f.c.c. and that they were strained to match the nickel lattice. Deposits greater than about 50 Å in thickness contained long, imperfect, misfit dislocations. The stacking faults associated with the misfit dislocations converted a little of the f.c.c. cobalt into the stable h.c.p. structure.
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