Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Surface Magnetism II (jointly with O)
MA 33.4: Vortrag
Mittwoch, 9. März 2016, 15:45–16:00, H31
Spin-hybridization between molecule and metal at room temperature through interlayer exchange coupling — •Manuel Gruber1,2,3, Fatima Ibrahim1, Samy Boukari1, Loïc Joly1, Wulf Wulfhekel2, Fabrice Scheurer1, Eric Beaurepaire1, Mebarek Alouani1, Wolfgang Weber1, and Martin Bowen1 — 1IPCMS, CNRS-UdS, Strasbourg, France — 2Karlsruher Institut für Technologie, Germany — 3IEAP, CAU Kiel, Germany
Strong coupling may exist between paramagnetic molecules and a ferromagnetic substrate. However, the study of such hybrid interfaces was so far limited to sublimable molecules deposited in ultra-high vacuum conditions in order to prevent the oxidation of the FM substrate. Here we investigated the possibility to use interlayer exchange coupling as the mediator of the molecule/FM magnetic coupling. Using X-ray magnetic circular dichroism (XMCD), we studied the magnetic coupling between manganese phthalocyanine (MnPc) molecules and a Cu(001)/Co FM substrate separated by a wedge-shaped Cu spacer. The XMCD data show that the Mn ion within MnPc molecules can be magnetically coupled to the Co substrate at room temperature when separated by up to 4 ML of Cu. The XMCD intensity evolves in an oscillatory manner with increasing Cu thickness. By decreasing the temperature, we could observe stronger oscillations in the magnetic coupling and this over a much larger Cu thickness range (up to 12 ML). The phase and the periods of the oscillatory coupling is found to be in agreement with interlayer-exchange-coupling theory [1].
[1] Gruber et al., Nano letters, DOI:10.1021/acs.nanolett.5b02961