Magnetic molecules as local sensors of topological hysteresis of superconductors

Giulia Serrano (), Lorenzo Poggini, Giuseppe Cucinotta, Andrea Luigi Sorrentino, Niccolò Giaconi, Brunetto Cortigiani, Danilo Longo, Edwige Otero, Philippe Sainctavit, Andrea Caneschi, Matteo Mannini () and Roberta Sessoli
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Giulia Serrano: University of Florence
Lorenzo Poggini: Institute for Chemistry of Organo-Metallic Compounds (ICCOM-CNR)
Giuseppe Cucinotta: University of Florence
Andrea Luigi Sorrentino: University of Florence
Niccolò Giaconi: University of Florence
Brunetto Cortigiani: University of Florence
Danilo Longo: Synchrotron SOLEIL, L’Orme des Merisiers
Edwige Otero: Synchrotron SOLEIL, L’Orme des Merisiers
Philippe Sainctavit: Synchrotron SOLEIL, L’Orme des Merisiers
Andrea Caneschi: University of Florence
Matteo Mannini: University of Florence
Roberta Sessoli: University of Florence

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Superconductors and magnetic materials, including molecules, are key ingredients for quantum computing and spintronics. However, only a little is known about how these materials interact in multilayer nanostructures like the hybrid architectures nowadays under development for such advanced applications. Here, we show that a single layer of magnetic molecules, Terbium(III) bis-phthalocyaninato (TbPc2) complexes, deposited under controlled UHV conditions on a superconducting Pb(111) surface is sensitive to the topology of the intermediate state of the superconductor, namely to the presence and evolution of superconducting and normal domains due to screening and penetration of an external magnetic field. The topological hysteresis of the superconducting substrate imprints a local evolution of the magnetisation of the TbPc2 molecules in the monolayer. Element and surface selective detection is achieved by recording the X-ray magnetic circular dichroism of the Tb atoms. This study reveals the impressive potential of magnetic molecules for sensing local magnetic field variations in molecular/superconductor hybrid devices, including spin resonators or spin injecting and spin filtering components for spintronics applications.

Date: 2022
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DOI: 10.1038/s41467-022-31320-5

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