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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Spin-crossover complex on Au(111): structural and electronic differences between mono- and multilayers.

Thiruvancheril G Gopakumar1, Matthias Bernien, Holger Naggert

  • 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel (Germany).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

Spin-crossover (SCO) complex films were prepared on gold. Multilayers show SCO, while monolayers dissociate, but intact SCO films can be formed at higher temperatures.

Keywords:
X-ray absorption spectroscopygoldironscanning tunnel microscopyspin crossoverspintronics

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Area of Science:

  • Materials Science
  • Surface Science
  • Chemistry

Background:

  • Spin-crossover (SCO) complexes are molecular switches sensitive to external stimuli.
  • Understanding SCO behavior in thin films is crucial for molecular device applications.
  • The Fe(II) SCO complex [Fe(bpz)2 (phen)] is a candidate for such applications.

Purpose of the Study:

  • To investigate the structural and spin properties of [Fe(bpz)2 (phen)] thin films on Au(111).
  • To determine the influence of layer thickness and substrate temperature on SCO behavior.
  • To explore methods for creating functional SCO monolayers on gold surfaces.

Main Methods:

  • Preparation of submono-, mono-, and multilayers of [Fe(bpz)2 (phen)] via vacuum deposition on Au(111).
  • Characterization using Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy.
  • Surface morphology and structure analysis using Scanning Tunneling Microscopy (STM).

Main Results:

  • Multilayers exhibit thermal spin crossover, though with broader transitions than bulk.
  • Monolayers and submonolayers dissociate into [Fe(bpz)2 ] and phen at room temperature.
  • Ordered, intact monolayers of [Fe(bpz)2 (phen)] are formed at elevated substrate temperatures.
  • These intact monolayers can be spin-switched using electron-induced excited spin-state trapping (ELIESST).

Conclusions:

  • Substrate temperature is critical for preserving the integrity of [Fe(bpz)2 (phen)] monolayers.
  • Intact SCO monolayers on Au(111) are achievable and exhibit switchable spin states.
  • This work demonstrates a pathway for fabricating functional SCO molecular layers on gold.