Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Surface Magnetism 2 (Joint Session with O)

MA 49.3: Vortrag

Donnerstag, 23. März 2017, 10:00–10:15, HSZ 401

Magnetic properties of the ultrathin Co films grown on the curved Ni(111) and Pd(111) single crystals — •Maxim Ilyn^1,2, Laura Fernandez², Ana Magaña^1,3, Philippe Ohresser⁴, Enrique Ortega^1,2,3, and Frederik Schiller¹ — ¹Materials Physics Center CSIC-UPV/EHU, San Sebastian, Spain — ²Donostia International Physics Center, San Sebastian, Spain — ³Department of Applied Physics, University of Basque Country, Bilbao, Spain — ⁴Synchrotron SOLEIL, LOrme des Merisiers, France

We investigated the effect of stress and coordination on the magnetic properties of Co nanostructures. The feature of the work is a use of the curved Pd and Ni single crystals as the substrates for the epitaxial growth of Co. The (111) face of these crystals was polished in a shallow cylindrical shape to expose gradually different vicinal surfaces with misorientation +/- 15 degrees towards [11-2] direction. Microscopically these surfaces consist of atomically flat terraces with (111) orientation separated by steps. Average terrace width changes along the curvature from few hundreds nm to 1-2 nm at the edge of the crystal.

In the curved crystals surface stress relaxes gradually with decreasing of the terrace allowing for the variable lattice mismatch between the substrate and the overlayer. Furthermore, atomic steps block diffusion of the adsorbed atoms between the terraces and being the preferential nucleation places change the morphology of the Co nanostructures from 2D islands in the big terraces to 1D atomic chains in the small ones. Our STM and XMCD data show variation of the growth mode and magnetic properties as a function of Co coverage and miscut angle.