Study of spin crossover nanoparticles thermal hysteresis using FORC diagrams on an Ising-like model

Atitoaie, Alexandru; Tanasa, Radu; Stancu, Alexandru; Enachescu, Cristian

doi:10.1016/j.jmmm.2014.04.054

Cited by 25 publications

(19 citation statements)

References 38 publications

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“…In addition, the anomaly upon cooling is shifted by ca. A deeper analysis along the available modelization of such a matrix or environment effect 29,30 would however be required and is beyond the scope of the present study. With such effects for standard manipulation of NPs, it could then be expected that washed raw NPs would have their SCO strongly modified.…”

Section: Nanoparticle Shape and Size And Influence Of Synthetic Condimentioning

confidence: 99%

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

2015

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The shape and size of nanoparticles of the spin crossover compound [Fe(Htrz) 2 trz]BF 4 obtained by the reverse-micelle method and using as co-surfactants dioctylsulfosuccinate and behenic acid are described through systematic transmission electron microscopy observations. A rod shape is systematically derived, and the rod sizes, in particular, their width, are controllable through the surfactant concentration, although a poor reproducibility is observed and ascribed to uncontrolled parameters in the micelle elaboration and microemulsion formation and ageing. The influence of synthetic parameters and nanoparticle processing on the spin crossover properties of nanoparticles is also reported, as characterized by both calorimetry and magnetic measurements. These unravel original size and environment effects. On the one hand, the hysteresis width of the thermal spin crossover exhibited by raw nanoparticles increases linearly with the rod width, until it reaches a value of 40 K, close to that of the bulk material. A similarly good correlation is found with the nanoparticle volume. On the other hand, the removal of the surfactant from the raw nanoparticles is found to systematically reduce the hysteresis width in a drastic manner, by up to 16 K.

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Section: Nanoparticle Shape and Size And Influence Of Synthetic Condimentioning

confidence: 99%

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

2015

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“…Such analysisisac haracterization methodt hat has been increasingly applied to variousm aterials that presents memory properties, that is, ah ysteretic behavior,w hich is used to characterize ferroelectric [58] and SCO systems. [59][60][61][62][63][64][65][66] AF ORC is obtained by measuring the thermald ependence of the magnetic moment m(T, T a )b etween the reversal temperature T a and an extreme temperature at which the system is fully saturated (in one of the spin state being either HS or LS). Before each FORC registration, the sample is brought to the saturation.…”

Section: Forc Diagram Investigationmentioning

confidence: 99%

Two‐Step Spin Transition in a 1D Fe^II 1,2,4‐Triazole Chain Compound

Dîrtu

Schmit

Naik

et al. 2015

Chemistry A European J

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A thermochromic 1D spin crossover coordination (SCO) polymer [Fe(βAlatrz)3](BF4)2⋅2 H2O (1⋅2 H2O), whose precursor βAlatrz, (1,2,4-triazol-4-yl-propionate) has been tailored from a β-amino acid ester is investigated in detail by a set of superconducting quantum interference device (SQUID), (57)Fe Mössbauer, differential scanning calorimetry, infrared, and Raman measurements. An hysteretic abrupt two-step spin crossover (T1/2(↓) = 230 K and T1/2(↑) = 235 K, and T1/2(↓) = 172 K and T1/2(↑) = 188 K, respectively) is registered for the first time for a 1,2,4-triazole-based Fe(II) 1D coordination polymer. The two-step SCO configuration is observed in a 1:2 ratio of low-spin/high-spin in the intermediate phase for a 1D chain. The origin of the stepwise transition was attributed to a distribution of chains of different lengths in 1⋅2 H2O after First Order Reversal Curves (FORC) analyses. A detailed DFT analysis allowed us to propose the normal mode assignment of the Raman peaks in the low-spin and high-spin states of 1⋅2 H2O. Vibrational spectra of 1⋅2 H2O reveal that the BF4(-) anions and water molecules play no significant role on the vibrational properties of the [Fe(βAlatrz)3](2+) polymeric chains, although non-coordinated water molecules have a dramatic influence on the emergence of a step in the spin transition curve. The dehydrated material [Fe(βAlatrz)3](BF4)2 (1) reveals indeed a significantly different magnetic behavior with a one-step SCO which was also investigated.

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“…To enhance the study of bistable behavior of the spin-crossover system under noise action it is interesting to find out the impact of noise influence on the dynamic potential. Fig.3 presents selected results, which is obtained for the stationary probability distributions of the system states from the Fokker-Plank equation (5) and the associated dynamic potentials. The analytical stationary probability (dashed line) and the associated dynamic potential (solid line) are compared to the ones obtained from the numerical simulation of Langevin equation 3, that was carried out according to the algorithm (8), for the ensemble of 300 trajectories (squared line) at the fixed noise intensities between 015 .…”

Section: Resultsmentioning

confidence: 99%

“…The main property, which makes these molecular magnetic materials attractive to data storage is bistability controlled by external physical fields. This bistable property is related to the existence of low-spin (LS) and high-spin (HS) configuration of degenerated d-orbitals of metal ion, which takes places due to the action of crystal field of the surrounded ligand and lead to the existence of hysteresis loop controlled by external field [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Hysteretic behavior of spin-crossover noise driven system

Gudyma

Maksymov

Dimian

2016

Physica B: Condensed Matter

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The influence of white Gaussian noise on hysteretic behavior of spin-crossover system is analyzed in the framework of stochastic Langevin dynamics. Various stochastic simulations are performed and several important properties of spintransition in spin-crossover system driven by noise are reproduced. The numerical results are tested against the stationary probability function and the associated dynamic potential obtained from Fokker-Planck equation corresponding to spincrossover Langevin dynamics. The dependence of light-induced optical hysteresis width and non-hysteretic transition curve slope on the noise intensity is illustrated. The role of low-spin and high-spin phase stabilities in the hysteretic behavior of noise-driven spin-crossover system is discussed.

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Study of spin crossover nanoparticles thermal hysteresis using FORC diagrams on an Ising-like model

Cited by 25 publications

References 38 publications

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

Two‐Step Spin Transition in a 1D Fe^II 1,2,4‐Triazole Chain Compound

Hysteretic behavior of spin-crossover noise driven system

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Study of spin crossover nanoparticles thermal hysteresis using FORC diagrams on an Ising-like model

Cited by 25 publications

References 38 publications

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

Critical assessment of the nature and properties of Fe(ii) triazole-based spin-crossover nanoparticles

Two‐Step Spin Transition in a 1D FeII 1,2,4‐Triazole Chain Compound

Hysteretic behavior of spin-crossover noise driven system

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Two‐Step Spin Transition in a 1D Fe^II 1,2,4‐Triazole Chain Compound