Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 4: Bio- und molekularer Magnetismus
MA 4.2: Talk
Monday, March 7, 2016, 09:45–10:00, H33
Long-range 2D-ferrimagnetic ordering in a chessboard-like supramolecular Kondo lattice — •Milos Baljozovic1, Jan Girovsky1, Jan Nowakowski1, Md. Ehesan Ali2, Harald R. Rossmann1, Thomas Nijs3, Elise Aeby3, Sylwia Nowakowska3, Dorota Siewert3, Gitika Srivastava1, Christian Wäckerlin4, Jan Dreiser1, Silvio Decurtins5, Shi-Xia Liu5, Peter M. Oppeneer2, Thomas A. Jung1, and Nirmalya Ballav6 — 1PSI, Switzerland — 2Uppsala University, Sweden — 3Universität Basel, Switzerland — 4EPFL, Switzerland — 5Universität Bern, Switzerland — 6IISER, India
Recently, there has been raising interest in investigations of fundamental magnetic interactions in low-dimensional systems. One such interaction is the Kondo effect responsible for suppression of the local moment, while another one, the RKKY coupling gives rise to a long-range spin ordering. Spin-bearing molecules on metallic substrates present a platform to study the interplay of these two opposing effects and can lead to even more intriguing phenomena. Here we present the first direct observation of long-range ferrimagnetic order in a 2D molecular Kondo lattice created by the co-assembly of FeFPc and MnPc molecules. The chessboard-like patterns on Au(111) substrates, have been investigated by STM/STS, XMCD and the DFT+U. At the first glance 2D and 1D ordering is in conflict with the classical theory of magnetism. In the present system, however, the substrate is of key importance; observed AFM coupling between the Mn and Fe centers is mediated by the surface states of Au(111) making the ordering possible.