Structural and magneto-transport characterization of Co2CrxFe1-xAl Heusler alloy films
Institute of Solid State Research, Electronic Properties (IFF6) and cni – Center of Nanoelectronic Systems for Information Technology, Research Center Jülich GmbH, 52425 Jülich, Germany
Corresponding author: a email@example.com
Revised: 20 June 2006
Published online: 21 August 2006
We investigate the structure and magneto-transport properties of thin films of the Co2Cr0.6Fe0.4Al 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.
PACS: 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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006