2026-06-01T02:48:54Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/1339962026-03-14T01:19:06Zcom_20.500.14352_14col_20.500.14352_15
Unveiling spin transition at single-particle level in levitating spin crossover nanoparticles
Pinilla Cienfuegos, Elena
Mascaró Burguera, Lucas
Torres Cavanillas, Ramón
Echavarría, J. Ignacio
Regueiro, Alejandro
Coronado, Eugenio
Hernández Rueda, Francisco Javier
535
538.9
Laser-induced spin transition
Molecular materials
Multispectral scattering microscopy
Quadrupole trap
Single-nanoparticle sensing
Single-particle photonics
Spin crossover
Óptica (Física)
Física de materiales
2209 Óptica
33 Ciencias Tecnológicas
Copyright © 2026 The Authors.
SEJIGENT/2021/039.
PRTR-C17.I1.
MFA/2022/050.
MFA/2022/025.
PROMETEO Program CIPROM/2024/51.
TSI-069100-2023-0012.
The ability to control and understand phase transitions of individual nanoscale building blocks is key to advancing the next generation of low-power reconfigurable nanophotonic devices. To address this critical challenge, molecular nanoparticles (NPs) exhibiting spin crossover (SCO) phenomenon are trapped by coupling a quadrupole Paul trap to a multispectral polarization-resolved scattering microscope. This contact-free platform simultaneously confines, optically excites, and monitors the spin transition in Fe(II)–triazole NPs in a pressure-tunable environment, eliminating substrate artifacts. Thus, we demonstrate light-driven manipulation of the spin transition in levitating NPs, enabled by laser heating and free of substrate-induced effects. Using the robust spin bistability near room temperature of our SCO system, we quantify reversible optovolumetric changes of up to 10%, revealing precise switching thresholds at the single-particle level. Independent pressure modulation produces a comparable volume increase, confirming mechanical control over the same bistable transition. These results constitute full real-time control and readout of spin states in levitating SCO NPs, with operating conditions compatible with ultralow-power optical switching, data storage, and nanoscale sensing.
Generatitat Valenciana
Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación
European Commission
Comunidad de Madrid
Depto. de Óptica
Fac. de Ciencias Físicas
TRUE
pub
2026-03-13T18:19:05Z
2026-03-13T18:19:05Z
2026-02-03
journal article
VoR
https://hdl.handle.net/20.500.14352/133996
1936-0851
10.1021/acsnano.5c18794
1936-086X
eng
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-128442NA-I00/ES/METASUPERFICIES RECONFIGURABLES COMBINANDO MATERIALES MOLECULARES Y CALCOGENUROS/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2024-2027/CNS2024-154922/ES
2020-T1/IND-19951
info:eu-repo/grantAgreement/EC/HE/101099676
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2024-001467-M
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-149309OB-I00/ES/MATERIALES MAGNETICOS 2D Y HETEROESTRUCTURAS HIBRIDAS PARA LA ESPINTRONICA, LA ENERGIA Y LAS TECNOLOGIAS NEUROMORFICAS/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-117264GB-I00/ES/DISEÑO DE MOLECULAS DE TRANSICION DE ESPIN QUIRALES PARA COMPUESTOS Y SUPERFICIES MULTIFUNCIONALES/
E. Pinilla-Cienfuegos, L. Mascaró-Burguera, R. Torres-Cavanillas, J.I. Echavarría, A. Regueiro, E. Coronado, and J. Hernandez-Rueda, “Unveiling Spin Transition at Single-Particle Level in Levitating Spin Crossover Nanoparticles,” ACS Nano 20(6), 5044–5053 (2026).
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
open access
application/pdf
American Chemical Society