Long-range ferrimagnetic order in a two-dimensional supramolecular Kondo lattice

Jan Girovsky (), Jan Nowakowski, Md. Ehesan Ali, Milos Baljozovic, Harald R. Rossmann, Thomas Nijs, Elise A. Aeby, Sylwia Nowakowska, Dorota Siewert, Gitika Srivastava, Christian Wäckerlin, Jan Dreiser, Silvio Decurtins, Shi-Xia Liu, Peter M. Oppeneer (), Thomas A. Jung () and Nirmalya Ballav ()
Additional contact information
Jan Girovsky: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute
Jan Nowakowski: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute
Md. Ehesan Ali: Institute of Nano Science and Technology
Milos Baljozovic: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute
Harald R. Rossmann: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute
Thomas Nijs: University of Basel
Elise A. Aeby: University of Basel
Sylwia Nowakowska: University of Basel
Dorota Siewert: University of Basel
Gitika Srivastava: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute
Christian Wäckerlin: Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL)
Jan Dreiser: Swiss Light Source, Paul Scherrer Institute
Silvio Decurtins: Departement für Chemie und Biochemie, Universität Bern
Shi-Xia Liu: Departement für Chemie und Biochemie, Universität Bern
Peter M. Oppeneer: Uppsala University
Thomas A. Jung: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute
Nirmalya Ballav: Indian Institute of Science Education and Research (IISER)

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Realization of long-range magnetic order in surface-supported two-dimensional systems has been challenging, mainly due to the competition between fundamental magnetic interactions as the short-range Kondo effect and spin-stabilizing magnetic exchange interactions. Spin-bearing molecules on conducting substrates represent a rich platform to investigate the interplay of these fundamental magnetic interactions. Here we demonstrate the direct observation of long-range ferrimagnetic order emerging in a two-dimensional supramolecular Kondo lattice. The lattice consists of paramagnetic hexadeca-fluorinated iron phthalocyanine (FeFPc) and manganese phthalocyanine (MnPc) molecules co-assembled into a checkerboard pattern on single-crystalline Au(111) substrates. Remarkably, the remanent magnetic moments are oriented in the out-of-plane direction with significant contribution from orbital moments. First-principles calculations reveal that the FeFPc-MnPc antiferromagnetic nearest-neighbour coupling is mediated by the Ruderman–Kittel–Kasuya–Yosida exchange interaction via the Au substrate electronic states. Our findings suggest the use of molecular frameworks to engineer novel low-dimensional magnetically ordered materials and their application in molecular quantum devices.

Date: 2017
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DOI: 10.1038/ncomms15388

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