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Journal Article

Coupling Single Molecule Magnets to Ferromagnetic Substrates

MPS-Authors
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Sessi,  V.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Stepanow,  S.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Gambardella,  P.
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Rizzini, A. L., Krull, C., Balashov, T., Kavich, J. J., Mugarza, A., Miedema, P. S., et al. (2011). Coupling Single Molecule Magnets to Ferromagnetic Substrates. Physical Review Letters, 107(17): 177205.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C05F-F
Abstract
We investigate the interaction of TbPc(2) single molecule magnets (SMMs) with ferromagnetic Ni substrates. Using element-resolved x-ray magnetic circular dichroism, we show that TbPc(2) 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. TbPc(2) 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 TbPc(2) can be magnetized parallel or antiparallel to the substrate, opening the possibility to exploit SMMs in spin valve devices.