INVESTIGADORES
PASSEGGI Mario Cesar Guillermo
congresos y reuniones científicas
Título:
Póster: Recognition of switching events in molecular nanoprobe experiment: an application to study spin transport
Autor/es:
RODRÍGUEZ-SOTELO, S.J.; MOYA, A.; AGUIRRE, M.H.; PASSEGGI (JR.), M.C.G.; IBARRA, R.; SERRATE, D.
Lugar:
San Carlos de Bariloche (Argentina), 6-11 November
Reunión:
Workshop; SPIN Argentina 2022, International Workshop on Spintronics; 2022
Institución organizadora:
Laboratorio de Resonancias Magnéticas, Centro Atómico Bariloche (CAB-CNEA)
Resumen:
Atomic-scale spin and charge transport properties are of great interest because they have numerous technological applications in spintronics. When exploring materials and combinations of materials suitable for spin transport, it is necessary to consider (i) the injection and electrical detection of spins and (ii) the spin transport in the material at the atomic scale. Experimentally methods capable of detecting spin and charge transport on the 1-5 nm scale are limited. Recently, a novel "molecular nanoprobe" (MONA) technique was reported that allows the transport of quasiparticles between two arbitrary points on a surface to be measured. In MONA experiments, hot electrons are injected into a sample surface from the magnetic and nonmagnetic probe tip of a scanning tunneling microscope (STM) and detected by tautomerization switching events of a single deprotonated dehydrogenated H1-Phthalocyanine molecule. The tautomerization switching events can be viewed in the STM images, because there is a change in the topography, this switching in this case consists of one hydrogen atom jumping among nitrogen sites. The current is proportional to the number of electrons reaching the molecule with enough potential energy to induce tautomerization transitions of the probe molecule by inelastic scattering. One of the great challenges of the technique is to perform a correct measurement of tautomerization events. In this work, we present an algorithm to recognize switch events in MONA experiments of topography images obtained by a scanning tunneling microscope (STM). The algorithm is based on the threshold method, specifically the Otsu method and was tested with more than 100000 STM MONA images.Expuso: RODRÍGUEZ-SOTELO, S.J.