Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
MA 20.56: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Coupling Single Molecule Magnets to Ferromagnetic Substrates — Alberto Lodi Rizzini1, Cornelius Krull1, •Timofey Balashov1, Jerald Kavich1, Aitor Mugarza1, Piter Miedema2, Pardeep Thakur3, Violetta Sessi3, Svetlana Klyatskaya4, Mario Ruben4, Sebastian Stepanow5, and Pietro Gambardella1 — 1ICN, Barcelona, Spain — 2Utrecht University, Utrecht, The Netherlands — 3ESRF, Grenoble, France — 4Institute of Nanotechnology, KIT, Germany — 5Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
We investigate the interaction of TbPc2 single molecule magnets (SMMs) with ferromagnetic Ni substrates. Using element-resolved x-ray magnetic circular dichroism, we show that TbPc2 couples antiferromagnetically to Ni films through ligand-mediated superexchange. This coupling is strongly anisotropic and can be manipulated by doping the interface with electron acceptor or donor atoms. We observe that the relative orientation of the substrate and molecule anisotropy axes critically affects the SMM magnetic behavior. TbPc2 complexes deposited on perpendicularly magnetized Ni films exhibit enhanced magnetic remanence compared to SMMs in the bulk. Contrary to paramagnetic molecules pinned to a ferromagnetic support layer, we find that TbPc2 can be magnetized parallel or antiparallel to the substrate, opening the possibility to exploit SMMs in spin valve devices.