Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 35, Issue 36, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/acd7ba
Keywords
spin crossover; Fe(II) complex; isothermal switching; spintronics; thin films; UV-Vis spectroscopy
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Using optical characterization, the study shows that the spin state of the spin crossover molecular complex [Fe{H2B(pz)(2)}(2)(bipy)] is influenced by the electric polarization of the adjacent polymer ferroelectric polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) thin film. The role of the PVDF-HFP thin film is significant but complex. UV-Vis spectroscopy measurements reveal that the electronic structure of [Fe{H2B(pz)(2)}(2)(bipy)] molecules in bilayers of PVDF-HFP/[Fe{H2B(pz)(2)}(2)(bipy)] can switch as a function of ferroelectric polarization at room temperature. The retention of voltage-controlled nonvolatile changes to the electronic structure in bilayers of PVDF-HFP/[Fe{H2B(pz)(2)}(2)(bipy)] strongly depends on the thickness of the PVDF-HFP layer. The PVDF-HFP/[Fe{H2B(pz)(2)}(2)(bipy)] interface may affect PVDF-HFP ferroelectric polarization retention in the thin film limit.
Using optical characterization, it is evident that the spin state of the spin crossover molecular complex [Fe{H2B(pz)(2)}(2)(bipy)] (pz = tris(pyrazol-1-1y)-borohydride, bipy = 2,2MODIFIER LETTER PRIME-bipyridine) depends on the electric polarization of the adjacent polymer ferroelectric polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) thin film. The role of the PVDF-HFP thin film is significant but complex. The UV-Vis spectroscopy measurements reveals that room temperature switching of the electronic structure of [Fe{H2B(pz)(2)}(2)(bipy)] molecules in bilayers of PVDF-HFP/[Fe{H2B(pz)(2)}(2)(bipy)] occurs as a function of ferroelectric polarization. The retention of voltage-controlled nonvolatile changes to the electronic structure in bilayers of PVDF-HFP/[Fe{H2B(pz)(2)}(2)(bipy)] strongly depends on the thickness of the PVDF-HFP layer. The PVDF-HFP/[Fe{H2B(pz)(2)}(2)(bipy)] interface may affect PVDF-HFP ferroelectric polarization retention in the thin film limit.
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