Iron(ii) spin crossover films on Au(111): scanning probe microscopy and photoelectron spectroscopy

Pronschinske, Alex; Bruce, Robert; Lewis, Geoff; Chen, Yifeng; Calzolari, Arrigo; Buongiorno-Nardelli, Marco; Shultz, David A.; You, Wei; Dougherty, Daniel B.

doi:10.1039/c3cc44904a

Cited by 71 publications

(101 citation statements)

References 50 publications

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“…21,22 The spin crossover transition temperature of the resulting powder, measured by magnetometry, was found to be about 160 K, in agreement with previous work. 19,[22][23][24][25][26][27] This temperature dependent spin crossover transition, for [Fe{H 2 B(pz) 2 } 2 (bipy)], is also evident in X-ray absorption, as indicated in Fig. 2(a).…”

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confidence: 70%

“…In the final product, the measured width and gap between the electrodes were 10 lm and 260 nm, respectively. X-ray diffraction, 29,30 Mossbauer spectroscopy, 24 scanning tunneling microscopy, 10,22 X-ray photoemission, 23 inverse photoemission, 19,27 X-ray absorption, 14,18,19,26,30 and of course magnetometry 19,[22][23][24][25][26][27]30 have all been used successfully to determine the spin state of [Fe{H 2 B(pz) 2 } 2 (bipy)]. X-ray absorption spectroscopy has the advantage of rapidity, distinct signature of the low spin state (Fig.…”

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confidence: 99%

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Nonvolatile voltage controlled molecular spin state switching

Hao

Mosey

Jiang

et al. 2019

Applied Physics Letters

107

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Voltage-controlled room temperature isothermal reversible spin crossover switching of [Fe{H 2 B(pz) 2 } 2 (bipy)] thin films is demonstrated. This isothermal switching is evident in thin film bilayer structures where the molecular spin crossover film is adjacent to a molecular ferroelectric. The adjacent molecular ferroelectric, either polyvinylidene fluoride hexafluoropropylene or croconic acid (C 5 H 2 O 5), appears to lock the spin crossover [Fe{H 2 B(pz) 2 } 2 (bipy)] 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 a transistor structure, the voltage controlled isothermal reversible spin crossover switching of [Fe{H 2 B(pz) 2 } 2 (bipy)] is accompanied by a resistance change and is seen to be nonvolatile, i.e., retained in the absence of an applied electric field. The result appears general, as the voltage controlled nonvolatile switching can be made to work with two different molecular ferroelectrics: croconic acid and polyvinylidene fluoride hexafluoropropylene.

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confidence: 70%

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confidence: 99%

Nonvolatile voltage controlled molecular spin state switching

Hao

Mosey

Jiang

et al. 2019

Applied Physics Letters

107

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“…19,20 The SCO transition temperature measured by magnetometry was found to be about 160 K, in agreement with prior work. 9,10,[19][20][21][22][23][24] This electrically neutral molecule was thermally evaporated on various substrates. We first grew magnetic (B100 nm) thin film NiCo 2 O 4 (111) on Al 2 O 3 (001) substrate by pulsed laser deposition (PLD).…”

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confidence: 99%

“…They have a coercivity of about 200 Oe at room temperature along the out-of-plane direction and a Curie temperature that is about 350 K, which is suitable for our purpose of switching magnetic moment direction around room temperature or even slightly above. The [Fe(H 2 B(pz) 2 ) 2 (bipy)] SCO molecule was deposited by thermal evaporation (as done elsewhere 4,[6][7][8][9][10]20,24 ), in a UHV growth chamber, on the NiCo 2 O 4 surface to a 10 nm thickness.…”

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confidence: 99%

Indications of magnetic coupling effects in spin cross-over molecular thin films

et al. 2018

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“…Several interesting results, e.g., the spin‐state dependence of electrical conductance, memristance behavior, electric field or electron‐induced SCO, and locking and unlocking of SCO around room temperature, have been reported. Vacuum sublimation of the complexes onto a suitable surface is the preferred method to obtain high‐quality surface layers of SCO complexes . Despite continuing efforts, only a few families of sublimable SCO complexes have been realized.…”

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confidence: 99%

Engineering On‐Surface Spin Crossover: Spin‐State Switching in a Self‐Assembled Film of Vacuum‐Sublimable Functional Molecule

et al. 2018

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The realization of spin-crossover (SCO)-based applications requires study of the spin-state switching characteristics of SCO complex molecules within nanostructured environments, especially on surfaces. Except for a very few cases, the SCO of a surface-bound thin molecular film is either quenched or heavily altered due to: (i) molecule-surface interactions and (ii) differing intermolecular interactions in films relative to the bulk. By fabricating SCO complexes on a weakly interacting surface, the interfacial quenching problem is tackled. However, engineering intermolecular interactions in thin SCO active films is rather difficult. Here, a molecular self-assembly strategy is proposed to fabricate thin spin-switchable surface-bound films with programmable intermolecular interactions. Molecular engineering of the parent complex system [Fe(H B(pz) ) (bpy)] (pz = pyrazole, bpy = 2,2'-bipyridine) with a dodecyl (C ) alkyl chain yields a classical amphiphile-like functional and vacuum-sublimable charge-neutral Fe complex, [Fe(H B(pz) ) (C -bpy)] (C -bpy = dodecyl[2,2'-bipyridine]-5-carboxylate). Both the bulk powder and 10 nm thin films sublimed onto either quartz glass or SiO surfaces of the complex show comparable spin-state switching characteristics mediated by similar lamellar bilayer like self-assembly/molecular interactions. This unprecedented observation augurs well for the development of SCO-based applications, especially in molecular spintronics.

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Iron(ii) spin crossover films on Au(111): scanning probe microscopy and photoelectron spectroscopy

Cited by 71 publications

References 50 publications

Nonvolatile voltage controlled molecular spin state switching

Nonvolatile voltage controlled molecular spin state switching

Indications of magnetic coupling effects in spin cross-over molecular thin films

Engineering On‐Surface Spin Crossover: Spin‐State Switching in a Self‐Assembled Film of Vacuum‐Sublimable Functional Molecule

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