Structural and magneto-transport characterization of Co 2 Cr x Fe 1-x Al Heusler alloy films

A. D. Rata, H. Braak, D. E. Bürgler (), S. Cramm and C. M. Schneider

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 4, 445-451

Abstract: We investigate the structure and magneto-transport properties of thin films of the Co 2 Cr 0.6 Fe 0.4 Al full-Heusler compound, which is predicted to be a half-metal by first-principles theoretical calculations. Thin films are deposited by magnetron sputtering at room temperature on various substrates in order to tune the growth from polycrystalline on thermally oxidized Si substrates to highly textured and even epitaxial on MgO(001) substrates, respectively. Our Heusler films are magnetically very soft and ferromagnetic with Curie temperatures up to 630 K. The total magnetic moment is reduced compared to the theoretical bulk value, but still comparable to values reported for films grown at elevated temperature. Polycrystalline Heusler films combined with MgO barriers are incorporated into magnetic tunnel junctions and yield 37% magnetoresistance at room temperature. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 75.47.-m Magnetotransport phenomena; materials for magnetotransport, 75.50.Cc Other ferromagnetic metals and alloys, 75.70.-i Magnetic properties of thin films, surfaces, and interfaces , (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00324-5

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