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Magnetic behaviour of TbPc2 single-molecule magnets chemically grafted on silicon surface

2014; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês

10.1038/ncomms5582

2041-1723

Matteo Mannini, Federico Bertani, Cristina Tudisco, Luigi Malavolti, Lorenzo Poggini, Kasjan Misztal, Daniela Menozzi, Alessandro Motta, Edwige Otero, Philippe Ohresser, Philippe Sainctavit, Guglielmo G. Condorelli, Enrico Dalcanale, Roberta Sessoli,

Porphyrin and Phthalocyanine Chemistry

Single-molecule magnets (SMMs) are among the most promising molecular systems for the development of novel molecular electronics based on spin transport. Going beyond investigations focused on physisorbed SMMs, in this work the robust grafting of terbium(III) bis(phthalocyaninato) complexes to a silicon surface from a diluted solution is achieved by rational chemical design yielding the formation of a partially oriented monolayer on the conducting substrate. Here by exploiting the surface sensitivity of X-ray circular magnetic dichroism, we evidence an enhancement of the magnetic bistability of this SMM, in contrast to the dramatic reduction of the magnetic hysteresis that characterizes monolayer deposits evaporated on noble and ferromagnetic metals. Photoelectron spectroscopy investigations and density functional theory analysis suggest a non-innocent role played by the silicon substrate, evidencing the potentiality of this approach for robust integration of bistable magnetic molecules in electronic devices. Single-molecule magnets exhibit magnetic hysteresis below a certain temperature. Mannini et al. now show that grafting such molecules onto a silicon substrate can enhance their magnetic bistability.