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In Situ AFM Imaging of Microstructural Changes Associated with The Spin Transition in [Fe(Htrz)₂(Trz)](Bf₄)
María D Manrique-Juárez1,2, Iurii Suleimanov3,4, Edna M Hernández5
1LCC, CNRS & Université de Toulouse (UPS, INP), Toulouse 31077, France. dolores.manrique@lcc-toulouse.fr.
Abstract:
Topographic images of [Fe(Htrz)₂(trz)](BF₄) nanoparticles were acquired across the first-order spin transition using variable-temperature atomic force microscopy (AFM) in amplitude modulation mode. These studies revealed a complex morphology of the particles consisting of aggregates of small nanocrystals, which expand, separate and re-aggregate due to the mechanical stress during the spin-state switching events. Both reversible (prompt or slow recovery) and irreversible effects (fatigue) on the particle morphology were evidenced and correlated with the spin crossover properties.
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