Meltable Spin Transition Molecular Materials with TunableTcand Hysteresis Loop Width

2015 ◽  
Vol 127 (49) ◽  
pp. 14990-14994 ◽  
Author(s):  
Tania Romero-Morcillo ◽  
Maksym Seredyuk ◽  
M. Carmen Muñoz ◽  
Jose A. Real
Keyword(s):  
Hysteresis Loop ◽  
Spin Transition ◽  
Molecular Materials ◽  
Hysteresis Loop Width

Meltable Spin Transition Molecular Materials with TunableTcand Hysteresis Loop Width

2015 ◽  
Vol 54 (49) ◽  
pp. 14777-14781 ◽  
Author(s):  
Tania Romero-Morcillo ◽  
Maksym Seredyuk ◽  
M. Carmen Muñoz ◽  
Jose A. Real
Keyword(s):  
Hysteresis Loop ◽  
Spin Transition ◽  
Molecular Materials ◽  
Hysteresis Loop Width

Compensation effects and relation between the activation energy of spin transition and the hysteresis loop width for an iron(ii) complex

2016 ◽  
Vol 18 (25) ◽  
pp. 16690-16699 ◽  
Author(s):  
Mark B. Bushuev ◽  
Denis P. Pishchur ◽  
Elena B. Nikolaenkova ◽  
Viktor P. Krivopalov
Keyword(s):  
Hysteresis Loop ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Activation Barrier ◽  
Spin Transition ◽  
Hysteresis Loops ◽  
High Activation ◽  
Activation Barriers ◽  
Spin Crossover Complexes ◽  
Hysteresis Loop Width

Wide thermal hysteresis loops for iron(ii) spin crossover complexes are associated with high activation barriers: the higher the activation barrier, the wider the hysteresis loop for a series of related spin crossover systems.

Spin Transition Molecular Materials for displays and data recording

1992 ◽  
Vol 4 (11) ◽  
pp. 718-728 ◽  
Author(s):  
Olivier Kahn ◽  
Jonas Kröber ◽  
Charlotte Jay
Keyword(s):  
Spin Transition ◽  
Data Recording ◽  
Molecular Materials

EXAFS and X-ray powder diffraction studies of the spin transition molecular materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)

1995 ◽  
Vol 7 (10) ◽  
pp. 1833-1842 ◽  
Author(s):  
Alain Michalowicz ◽  
Jacques Moscovici ◽  
Bernard Ducourant ◽  
Denis Cracco ◽  
Olivier Kahn
Keyword(s):  
Powder Diffraction ◽  
Spin Transition ◽  
Molecular Materials ◽  
X Ray

A mononuclear five-coordinate Co(ii) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states

2018 ◽  
Vol 47 (46) ◽  
pp. 16596-16602 ◽  
Author(s):  
Lei Chen ◽  
Jingbo Song ◽  
Wen Zhao ◽  
Gangji Yi ◽  
Zhikuan Zhou ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Spin Crossover ◽  
Spin Transition ◽  
Single Molecule Magnet ◽  
Pyramidal Geometry ◽  
Mononuclear Cobalt ◽  
Slow Magnetic Relaxation ◽  
Square Pyramidal Geometry

A mononuclear cobalt(ii) complex with square pyramidal geometry displays a spin transition with a small hysteresis loop and slow magnetic relaxation.

Dynamical control of the spin transition inside the thermal hysteresis loop of a spin-crossover single crystal

2016 ◽  
Vol 486 ◽  
pp. 187-191 ◽  
Author(s):  
Kamel Boukheddaden ◽  
Mouhamadou Sy ◽  
Miguel Paez-Espejo ◽  
Ahmed Slimani ◽  
François Varret
Keyword(s):  
Single Crystal ◽  
Hysteresis Loop ◽  
Spin Crossover ◽  
Thermal Hysteresis ◽  
Spin Transition ◽  
Thermal Hysteresis Loop ◽  
Dynamical Control

Hysteresis in vortex-induced vibrations: critical blockage and effect of m*

2011 ◽  
Vol 671 ◽  
pp. 207-225 ◽  
Author(s):  
T. K. PRASANTH ◽  
V. PREMCHANDRAN ◽  
SANJAY MITTAL
Keyword(s):  
Reynolds Number ◽  
Hysteresis Loop ◽  
Critical Mass ◽  
Three Dimensional ◽  
Mass Ratio ◽  
Hysteretic Behaviour ◽  
Stabilized Finite Element ◽  
Stabilized Finite Element Method ◽  
Vortex Induced Vibrations ◽  
Hysteresis Loop Width

The hysteretic behaviour of a freely vibrating cylinder, near the low-Reynolds-number end of synchronization/lock-in, in the laminar regime is investigated. Computations are carried out using a stabilized finite-element method. The flow remains two-dimensional in this Reynolds number regime. This is verified via comparison of two- and three-dimensional computations. The cylinder is free to undergo crossflow as well as in-line vibrations. The combined effect of mass ratio (1 ≤ m* ≤ 100) and blockage (0.25% ≤ B ≤ 12.5%) is studied in detail. The existence of a critical mass ratio (m*cr = 10.11), below which hysteresis disappears for an unbounded flow situation, is identified. For higher mass ratio the hysteretic behaviour is observed for all blockage. However, the hysteresis loop width is found to vary with B; its variation with m* and B is studied. The concept of critical blockage Bcr is introduced. For B ≤ Bcr the response of the cylinder is virtually the same as that in an unbounded flow domain. The variation of Bcr with m* is investigated. Furthermore, Bcr is found to vary non-monotonically with m* for m* ≤ m*cr and is almost constant for m* ≥ 20. The effect of damping, as well as restricting the cylinder to undergo transverse vibrations only, on the hysteresis behaviour is studied. The transverse-only motion leads to a larger hysteresis loop width compared with the transverse and the in-line motion of the cylinder. An attempt is made to explain this by comparing the results from forced vibrations.

scholarly journals Spin Transition in the Cu(hfac)2 Complex with (4-Ethylpyridin-3-yl)-Substituted Nitronyl Nitroxide Caused by the “Asymmetric” Structural Rearrangement of Exchange Clusters in the Heterospin Molecule

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 285 ◽  
Author(s):  
Natalia Artiukhova ◽  
Galina Romanenko ◽  
Gleb Letyagin ◽  
Artem Bogomyakov ◽  
Sergey Veber ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hysteresis Loop ◽  
Wide Temperature Range ◽  
Spin Transition ◽  
Structural Rearrangement ◽  
Considerable Change ◽  
Spin Coupling ◽  
Paramagnetic Centers ◽  
Nitronyl Nitroxide ◽  
Low Temperature Process

Methods for the synthesis of binuclear [Cu(hfac)2LEt]2 and tetranuclear [[Cu(hfac)2]4(LEt)2] heterospin compounds based on copper hexafluoroacetylacetonate [Cu(hfac)2] and 2-(4-ethylpyridin-3-yl)-4,5-bis(spirocyclopentyl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (LEt), were developed. The crystals of the complexes are elastic and do not crash during repeated cooling–heating cycles. It was found that a singlet–triplet conversion occurred in all of the {Cu(II)–O•–N<} exchange clusters in the molecules of the binuclear [Cu(hfac)2LEt]2 which led to spin coupling with cooling. The transition occurred in a wide temperature range with a maximum gradient ΔχT at ≈180 K. The structural transformation of the crystals takes place at T < 200 K and is accompanied by the lowering of symmetry from monoclinic to triclinic, twinning, and a considerable shortening of the Cu–ONO distance (2.19 and 1.97 Å at 295 and 50 K, respectively). For the tetranuclear [[Cu(hfac)2]4(LEt)2], two structural transitions were recorded (at ≈154 K and ≈118 K), which led to a considerable change in the spatial position of the Et substituent in the nitronyl nitroxyl fragment. The low-temperature process was accompanied by a spin transition recorded as a hysteresis loop on the χT(T) curve during the repeated cooling–heating cycles (T½↑ = 122 K, T½↓ = 115 K). This transition is unusual because it causes spin coupling in half of all of the {>N–•O–Cu2+} terminal exchange clusters, leading to spin compensation for only two paramagnetic centers of the six centers in the molecule.

Spin-Transition Molecular Materials for Display and Data Processing

1996 ◽  
pp. 298-310 ◽  
Author(s):  
Olivier Kahn ◽  
Epiphane Codjovi ◽  
Yann Garcia ◽  
Petra J. van Koningsbruggen ◽  
René Lapouyade ◽  
...  
Keyword(s):  
Data Processing ◽  
Spin Transition ◽  
Molecular Materials
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