Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Magnetic Particles
MA 39.8: Vortrag
Donnerstag, 10. März 2016, 11:30–11:45, H31
Strain analysis with atomic resolution at FePt-substrate interfaces — •S. Wicht1,2, S. H. Wee3, O. Hellwig3, D. Weller3, and B. Rellinghaus1 — 1IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany. — 2TU Dresden, IFWW, D-01062 Dresden, Germany. — 3HGST, 3403 Yerba Buena Rd, San Jose, CA-95135, USA.
Highly textured L10-ordered FePt films are foreseen to overcome the performance of state of the art CoCrPt based perpendicular media and achieve storage densities beyond 1.5 TBit/in2. A crucial criteria to develope the full potential of the film is a distinct (001) texture of the L10 phase. The common way to achieve an out-of-plane (oop) texture is to growth FePt epitaxially on an appropriate seed layer, namely MgO. MgO, however, causes some drawbacks like a poor wetting behavior of FePt and a certain misalignment of the easy axis orientation. To further investigate this phenomenon and the influence of the lattice mismatch between the unit cells of FePt and the substrate, discontinuous FePt films are grown on single crystals of (La,Sr)(Al,Ta)O3, SrTiO3, MgAl2O4 and MgO. The FePt films exhibit mainly oop textured islands. Nevertheless, undesired fractions of L12-ordered and in-plane oriented crystals are occur at reduced lattice mismatches. Quantitative HRTEM analyses reveal that enhanced lattice mismatches are accompanied by an increased density of dislocations at the interface, which goes along with a broadened FePt (002) rocking curve. The correlations of these findings will be discussed within the presentation.