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Schlagwörter:
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Zusammenfassung:
Heusler half-metals are promising for spintronic applications. Epitaxial
thin films of the exemplar compound Co(2)Cr(0.6)Fe(0.4)Al (CCFA) were
investigated using conversion electron Mossbauer spectroscopy to clarify
the factors influencing the spin polarization. CCFA films were deposited
by rf magnetron sputtering on MgO substrates with and without an Fe
buffer layer. Annealing improves their crystallographic order, causes
the diffusion of Fe atoms from the Fe buffer layer into the CCFA, and
favors the Co-Fe disorder. The listed factors are possible reasons for
the increase and subsequent reduction of the tunneling magnetoresistance
in CCFA thin films observable across the annealing temperature range.
(C) 2008 American Institute of Physics.
