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Electric field manipulation of the molecular spin state of a Fe(II) spin crossover complex

ORAL

Abstract

The spin crossover (SCO) phenomenon, in 3d transition metal compounds, has potential applicability in molecular spintronic devices for low-cost flexible memory. Isothermal changes of the electronic structure has now been achieved for the Fe(II) spin crossover complex [Fe{H2B(pz)2}2(bipy)], where pz = tris(pyrazol-1-yl)- borohydride and bipy = 2,2’-bipyridine, by external electric fields. This isothermal voltage-controlled switching is evident in thin film bilayer structures where the molecular spin crossover film is adjacent to a molecular ferroelectric thin film (the tested examples being polyvinylidene fluoride hexafluoropropylene or croconic acid (C5H2O5)). These organic ferroelectric substrates appear to lock the spin crossover molecular complex largely in the low or high spin state depending on the direction of ferroelectric polarization, in both a planar two terminal diode structure and for a transistor structure. Moreover, the spin state change is observed to be accompanied by a conductance change, where higher conductance occurs at a high spin state while lower conductance is observed for a low spin state, and is seen to be nonvolatile, i.e. the spins state is retained in the absence of an applied electric field.

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Presenters

  • Guanhua Hao

    University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska

Authors

  • Guanhua Hao

    University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska

  • Aaron Mosey

    Physics Department, Indiana University Purdue University-Indianapolis

  • Xuanyuan Jiang

    University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska

  • Alpha T. N'Diaye

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, Advanced Light Source, Lawrence Berkeley National Laboratory, Adv Light Source LBL

  • Xin Zhang

    University of Nebraska - Lincoln, Department of Chemistry, University of Nebraska–Lincoln

  • Jian Zhang

    University of Nebraska - Lincoln, Department of Chemistry, University of Nebraska–Lincoln

  • Ruihua Cheng

    Physics Department, Indiana University Purdue University-Indianapolis

  • Xiaoshan Xu

    University of Nebraska - Lincoln, Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Department of Physics and Astronomy, University of Nebraska - Lincoln, Physics & Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy, University of Nebraska

  • Peter A Dowben

    University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska, Physics and Astronomy, University of Nebraska - Lincoln