Atomic force microscopy and near-field optical imaging of a spin transition

Manuel Lopes (1) , Carlos M. Quintero (1) , Edna Laporte Hernandez (1) , Víctor Velázquez (2) , Carlos Bartual-Murgui (1) , William Nicolazzi (1) , Lionel Salmon (1) , Gábor Molnár (1) , Azzedine Bousseksou (1)

1 LCC - Laboratoire de chimie de coordination
2 UNAM - Universidad Nacional Autónoma de México = National Autonomous University of Mexico

We report on atomic force microscopy (AFM) and near-field scanning optical microscopy (NSOM) investigations of single crystals of the spin crossover complex {Fe(pyrazine)[Pt(CN)4]} across the first-order thermal spin transition. We demonstrate for the first time that the change in spin state can be probed with sub-micrometer spatial resolution through various topographic features extracted from AFM data. This original approach based on surface topography analysis should be easy to implement to any phase change material exhibiting sizeable electron–lattice coupling. In addition, AFM images revealed specific topographic features in the crystals, which were correlated with the spatiotemporal evolution of the transition observed by far-field and near-field optical microscopies.

Domaines: Chimie de coordination

Manuel Lopes, Carlos M. Quintero, Edna Laporte Hernandez, Víctor Velázquez, Carlos Bartual-Murgui, et al.. Atomic force microscopy and near-field optical imaging of a spin transition. Nanoscale, 2013, 5 (17), pp.7762. ⟨10.1039/C3NR03030J⟩. ⟨hal-02908194⟩