Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Surface Magnetism II (jointly with O)
MA 33.5: Talk
Wednesday, March 9, 2016, 16:00–16:15, H31
Exchange bias and room temperature magnetic order in molecular layers — •Manuel Gruber1,2,3, Fatima Ibrahim1, Samy Boukari1, Hironari Isshiki2, Loïc Joly1, Wulf Wulfhekel2, Fabrice Scheurer1, Wolfgang Weber1, Mebarek Alouani1, Eric Beaurepaire1, and Martin Bowen1 — 1IPCMS, CNRS-UdS, Strasbourg, France — 2PI, Karlsruher Institut für Technologie, Germany — 3IEAP, CAU Kiel, Germany
Considerable attention was focused at the interface between a ferromagnet and an organic molecular layer, where promising spintronic properties appear. Separately, molecular semiconductor may exhibit antiferromagnetic (AF) correlations well below RT. Yet, surprisingly, while magnetic pinning of a FM layer through exchange bias with an AF layer constitutes a cornerstone of spintronics, this ingredient remains missing in molecular spintronics. We performed X-ray magnetic circular dichroism measurements on paramagnetic manganese-phthalocyanine (MnPc) molecules deposited onto a FM Co(001) surface. The measurements, in combination with ab initio calculations, show that the Co/MnPc spinterface stabilizes an AF ordering at room temperature within subsequent MnPc monolayers away from the interface. In turn, we studied the impact of the AF MnPc layer on the Co substrate using the magneto-optic Kerr effect: the molecular AF layer magnetically pins the underlying Co film at temperatures below 100 K [1].
[1] Gruber et al., Nat. Mater. 14, 981 (2015)