Helical-Chain Copper(II) Complexes and a Cyclic Tetranuclear Copper(II) Complex with Single Syn−Anti Carboxylate Bridges and Ferromagnetic Exchange Interactions

2000 ◽  
Vol 39 (13) ◽  
pp. 2882-2890 ◽  
Author(s):  
Enrique Colacio ◽  
Mustapha Ghazi ◽  
Raikko Kivekäs ◽  
José Maria Moreno
Keyword(s):  
Exchange Interactions ◽  
Helical Chain ◽  
Ferromagnetic Exchange

First-Principles Study on Co-Doped ZnO with Oxygen Vacancy

2010 ◽  
Vol 154-155 ◽  
pp. 124-129
Author(s):  
Zhen Zhen Weng ◽  
Zhi Gao Huang ◽  
Wen Xiong Lin
Keyword(s):  
Oxygen Vacancy ◽  
First Principles ◽  
Density Functional ◽  
Exchange Interactions ◽  
First Principles Calculations ◽  
Functional Theory ◽  
Ferromagnetic Exchange ◽  
Ferromagnetic Ground State ◽  
Doped Zno ◽  
Co Doped

The interatomic exchange interactions and the electronic structure of Co-doped ZnO with and without oxygen vacancy have been investigated by the first-principles calculations based on density functional theory. It is found that the oxygen vacancy can strengthen the ferromagnetic exchange interaction between Co atoms and might be available for carrier mediation. The oxygen vacancy near to the Co atoms is more favorable for the ferromagnetic ground state.

scholarly journals Low pH constructed Co(ii) and Ni(ii) 1D coordination polymers based on Cα-substituted analogues of zoledronic acid: structural characterization, and spectroscopic and magnetic properties

RSC Advances ◽  
2019 ◽  
Vol 9 (54) ◽  
pp. 31497-31510 ◽  
Author(s):  
Tomasz Rojek ◽  
Waldemar Goldeman ◽  
Katarzyna Ślepokura ◽  
Marek Duczmal ◽  
Agnieszka Wojciechowska ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Zoledronic Acid ◽  
Coordination Polymers ◽  
Structural Characterization ◽  
Exchange Interactions ◽  
Low Ph ◽  
Metal Centers ◽  
Ferromagnetic Exchange

1D Co(ii)/Ni(ii) coordination polymers with alternating antiferromagnetic–ferromagnetic exchange interactions between metal centers propagated through double (–O–P–O–)2 bridges.

Ferromagnetic intermolecular exchange interaction in ethynyl-verdazyl radical crystals

CrystEngComm ◽  
2014 ◽  
Vol 16 (42) ◽  
pp. 9783-9787 ◽  
Author(s):  
Areej Merhi ◽  
Thierry Roisnel ◽  
Stéphane Rigaut ◽  
Cyrille Train ◽  
Lucie Norel
Keyword(s):  
Exchange Interaction ◽  
Exchange Interactions ◽  
Π Interactions ◽  
Verdazyl Radical ◽  
Ferromagnetic Exchange ◽  
1D Chains

The newly synthesized p-ethynylphenyl-oxoverdazyl radical shows unusual slipped 1D chains held together by π–π interactions leading to ferromagnetic exchange interactions.

Formation of a novel ferromagnetic end-to-end cyanate bridged homochiral helical copper(ii) Schiff base complex via spontaneous symmetry breaking

2015 ◽  
Vol 44 (2) ◽  
pp. 493-497 ◽  
Author(s):  
Anik Bhattacharyya ◽  
Biswa Nath Ghosh ◽  
Santiago Herrero ◽  
Kari Rissanen ◽  
Reyes Jiménez-Aparicio ◽  
...  
Keyword(s):  
Schiff Base ◽  
Coordination Polymer ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Schiff Base Complex ◽  
Exchange Interactions ◽  
Base Complex ◽  
Ferromagnetic Exchange ◽  
End To End

A homochiral helical coordination polymer of copper(ii) has been synthesized using achiral precursors. End-to-end cyanate bridges mediate ferromagnetic exchange interactions among copper(ii) centres.

Magnetism of a graphite bi-intercalation compound with two types of ferromagnetic layers: double hysteretic transition in CrCl3–NiCl2–C

1990 ◽  
Vol 68 (12) ◽  
pp. 1435-1439 ◽  
Author(s):  
D. G. Rancourt ◽  
S. Flandrois ◽  
P. Biensan ◽  
G. Lamarche
Keyword(s):  
Intercalation Compound ◽  
Exchange Interactions ◽  
Atomic Scale ◽  
Temperature Hysteresis ◽  
Low Field ◽  
Ferromagnetic Exchange ◽  
Graphite Intercalation ◽  
Ferromagnetic Layers ◽  
Double Transition ◽  
Plane Interaction

An atomic-scale multilayer with two types of ferromagnetic layers is achieved by graphite intercalation. It is a bi-intercalation compound with stacking sequence CrCl3NiCl2NiCl2/… where/represents a graphite layer. The two types of chloride layers are much as they occur in the pristine chlorides and have the same lattice parameters and intralayer intertransition–metal ferromagnetic exchange interactions. The transition temperatures for singly intercalated CrCl3 and NiCl2 graphite compounds are, respectively, 11.3, and 20.2 K. The bi-intercalation compound shows a "double transition" with Tc1 and Tc2 being equal to the relevant intercalate-specific temperatures. It is proposed that, as the temperature is lowered, the NiCl2 layers order first at Tc2 into a 3-D antiferromagnetic stacking of ferromagnetic planes, followed by onset of intra-CrCl3-layer ferromagnetic order at Tc1. Below Tc1 the two types of ferromagnetic planes probably assume a 3-D antiferromagnetic stacking that involve both types of layers, requiring that the NiCl2 stacking be different than at Tc1 < T < Tc2. The main interlayer interactions are believed to be dipole–dipole forces and these are seen to give large low-field temperature hysteresis effects. This is in contrast to many layered materials with antiferromagnetic in-plane interactions in which: (i) dipole–dipole forces do not play a significant role, (ii) 3-D order is not intercalate specific but occurs at temperatures that are much lower than the in-plane interaction strengths and that are highly dependent on the interlayer interaction strengths, and (iii) hysteresis effects are not observed.

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