Dresden 2006 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.17: Poster
Tuesday, March 28, 2006, 15:15–19:15, P1
Epitaxial thin films of Co2Cr0.6Fe0.4Al — •Andres Conca, Martin Jourdan, Anna Gerken, Christian Herbort, and Hermann Adrian — Institut für Physik, Johannes Gutenberg Universität, Staudinger Weg 7, 55128 Mainz, Germany
The full Heusler compound Co2Cr0.6Fe0.4Al (CCFA) is expected to show half-metallicity, i.e. 100 % spin polarization at EF. We were able to deposite high quality CCFA thin films. The films were deposited by magnetron dc sputtering in a chamber with a base pressure ≈ 10−8mbar. A comparison of films deposited on different buffer layers at different temperatures is shown. The crystalline order was studied by X-ray diffraction. We observed that the films grow in the B2 structure. The preference of CCFA films to grow in the B2 structure instead of the fully ordered structure L21 is well known. This implies a complete mixing of Cr, Fe and Al atoms. The magnetic properties were determined with a VSM magnetometer, the relation between volume magnetization and crystalline quality of the samples is discussed. In order to implement CCFA films in spintronic devices such as MTJ’s, the surface quality of the films is of critical importance. Therefore, the surface order was characterized by RHEED and the topology by STM/AFM. The dependence of surface roughness and ordering on the deposition temperature for the different buffer layers is discussed.