Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 12: Nanostructures at surfaces: Dots, particles, clusters I (magnetic)

O 12.2: Talk

Monday, March 23, 2009, 15:15–15:30, SCH A215

Ultra-high dense array of magnetic quantum dots on a self-assembled nanostructured template — •Laura Fernández¹, Martina Corso², Maxim Ilyn³, Frederik Schiller⁴, and José Enrique Ortega^1,2,4 — ¹Departamento de Física Aplicada I, Universidad del País Vasco, San Sebastián, Spain — ²DIPC, San Sebastián, Spain — ³Física de Materiales, Universidad del País Vasco, San Sebastián, Spain — ⁴Unidad de Física de Materiales, Centro Mixto CSIC-UPV/EHU, San Sebastián, Spain

The growth of magnetic nanoparticles on surfaces by auto-organization processes represents a flexible and powerful alternative to obtain high-density, patterned magnetic storage media. Here, we report on the growth of a dense array of Co quantum dots on a previously designed template formed by a Moiré surface structure, which allows the achievement of dot areal densities that overcome the boundary of 1 Teradots/inch². The structural properties of the template and the tunability of the quantum dot array have been thoroughly explored by Scanning Tunnelling Microscopy at several deposition temperatures and different Co coverage. The magnetic response of the Co quantum dots has been investigated by vibrating sample magnetometry, showing an uniaxial out-of-plane anisotropy and soft magnetic behaviour at 300 K.