Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Magnetic Nanoparticles
MA 9.3: Vortrag
Montag, 31. März 2014, 15:30–15:45, HSZ 401
Magnetic Properties of Self-Assembled Fe Nanoislands on Barium Titanate (001) — Remya K. Govind1, Vasili Hari Babu2, Cheng-Tien Chiang1,3, Elena Magnano4, Federica Bondino4, Reinhard Denecke2, and •Karl-Michael Schindler1 — 1Martin-Luther-Universität Halle-Wittenberg, Halle — 2Universität Leipzig, Leipzig — 3Max-Planck-Institut für Mikrostrukturphysik, Halle — 4IOM-CNR, Trieste, Italy
The coercivity and saturation magnetization of ultrathin films of Fe on a BaTiO3(001) single crystal substrate have been determined using magneto-optic Kerr effect (MOKE) and X-ray magnetic circular dichroism (XMCD) as a function of annealing temperature. Films deposited at room temperature exhibit bulk-like properties, whereas with increasing annealing temperature coercivity increases and saturation magnetization decreases. Investigations with scanning electron microscopy (SEM) and low-energy electron diffraction (LEED) reveal that annealing causes a morphology transformation from a continuous flat film, which completely covers the substrate, to nanoislands via self-assembled growth. The morphology and size of the islands imply stronger pinning of domain walls or complex magnetic structures as the origin of their particular magnetic properties.