Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 19: Poster I: Multiferroics (jointly with MA, DF, KR, TT), Spins in organic materials (jointly with MA), FePt Nanoparticles (jointly with MA, MM)

DS 19.56: Poster

Tuesday, March 27, 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.