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Séminaire Chimie ED459

Photoinduced magnetization in nanometer scale heterostructures of Prussian blue analogues

Dr. Daniel R. Talham (Department of Chemistry, University of Florida, Gainesville, USA)

publié le

Le Jeudi 28 Mars 2013 à 13h45
UM2, salle de cours SC-16.01

Nanometer scale heterostructures of Prussian blue analogues lead to new phenomena not observed for the constituent bulk phases. A striking example [1] is the ABA thin film heterostructure comprised of ferromagnetic Rb0.8Ni4.0[Cr(CN)6]2.9nH2O (Ni-Cr PBA) and the photomagnetic Rb0.7Co4.0[Fe(CN)6]3nH2O (Co-Fe PBA). The films experience a significant increase in the temperature, from 18 K to 75 K, at which large persistent photoinduced changes in magnetization occur. The behavior results from a new mechanism for inducing magnetization changes in molecule-based magnetic materials using light. Light induced structural changes in the Co-Fe PBA layer couple to the adjacent magnetic network. The behavior results from the ability to couple the two materials at the nanometer length scale. In general, achieving nanoscale heterostructures of molecule-based networks and solids requires new synthetic approaches and this system along with other thin film and nanoparticle [2] examples will be discussed.

Figure 1 (cliquer pour l’agrandir)

Figure 1. Left : Scheme and TEM cross section of an ABA heterostructured thin film of two Prussian blue analogues. The scale bar is 100 nm.[1] Right : TEM image of a BAB heterostructured particle of the same.


1. D. M. Pajerowski et al., J. Am. Chem. Soc. 2010, 132, 4058-59.
2. M. F. Dumont et al., Inorg. Chem. 2011, 50, 4295-4300.

Contact local ICGM : Dr. Jérôme Long (équipe CMOS)


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