Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Magnetic Thin Films I (Heusler Alloys)
MA 6.17: Vortrag
Montag, 22. März 2010, 18:45–19:00, H10
Perpendicular magnetic anisotropy in Co3Pt thin films — •Christian Schubert, Denys Makarov, Christoph Brombacher, Katja Neupert, Mirko Kehr, Walter Hoyer, and Manfred Albrecht — Chemnitz University of Technology, Institute of Physics, D-09107 Chemnitz, Germany
Binary alloys of MxPt1−x (M = Fe, and Co) prepared as thin films tend to show a strong perpendicular magnetic anisotropy (PMA), making them good candidates for magnetic recording media or sensoric devices. The magnetic response of MxPt1−x films can be strongly modified by the degree of composition, film thickness, deposition temperature, and nature of substrate. Thus, chemically disordered CoPt alloys with (111) texture exhibit an unexpected PMA related to an anisotropic short-range order (SRO) effect [1]. Here we present an investigation of structural and magnetic properties of Co3Pt alloy films in the thickness range from 5 to 20 nm. The magnetic layers were deposited using magnetron co-sputtering on thermally oxidized Si(100) wafers. Interestingly, even when deposited at room temperature, these films reveal the presence of a strong PMA (KU = 0.6 MJ/m3) with a full remanence in the out-of-plane direction. Furthermore, owing to the high Co content, the alloy has a rather high value of saturation magnetization of about 0.8 T. To access the structural properties of the alloy, a x-ray diffraction study was carried out. However, no superstructure peaks which might be attributed to a chemical long range order have been observed indicating that SRO is the origin for the PMA. [1] Y. Yamada et al., J. Appl. Phys. 83 (1998) 6527.