Abstract
Thin films of the Heusler alloy Ni 2 MnIn are deposited at substrate temperatures between 50 and 300 ∘ C on a variety of substrates by coevaporation of Ni and the alloy MnIn. The morphology and crystal structure of films grown on amorphous carbon films and Si 3 N 4 membranes are investigated by transmission-electron microscopy and transmission-electron diffraction. The stoichiometry of the films is determined by energy-dispersive X-ray spectroscopy. Films on Si(1 0 0), InAs(1 0 0), and in situ cleaved (1 1 0) surfaces of InAs are investigated using scanning-electron microscopy. Point-contact Andreev spectroscopy serves to quantify the spin polarization relevant for transport. The possibility of nanopatterning Ni 2 MnIn films with the lift-off technique is examined. In this context the influence of post-growth annealing on the film's morphology and crystal structure is studied.
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