Exchange bias in a nanogranular system with competing ferromagnetic and antiferromagnetic exchange interactions

2011 ◽  
Vol 248 (12) ◽  
pp. 2932-2940 ◽  
Author(s):  
Yong Hu ◽  
An Du
Keyword(s):  
Exchange Bias ◽  
Exchange Interactions ◽  
Antiferromagnetic Exchange

scholarly journals Manganese Fluorene Phosphonates: Formation of Isolated Chains

Inorganics ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 92 ◽  
Author(s):  
Clarisse Bloyet ◽  
Jean-Michel Rueff ◽  
Vincent Caignaert ◽  
Bernard Raveau ◽  
Jean-François Lohier ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Hydrogen Bonds ◽  
Phosphonic Acid ◽  
Van Der Waals ◽  
Exchange Interactions ◽  
Van Der Waals Interactions ◽  
Antiferromagnetic Exchange ◽  
Hydrothermal Conditions ◽  
Hirshfeld Surfaces ◽  
Nitrate Tetrahydrate

9,9-dimethylfluorenyl-2-phosphonic acid 1 was reacted with manganese nitrate tetrahydrate to produce under hydrothermal conditions the crystalline manganese phosphonate Mn(H2O)2[O2(OH)PC15H13]2·2H2O which crystallize in the P21/c space group. This compound is a rare example of Mn-phosphonate material featuring isolated chains. The interactions between these chains containing the 9,9-dimethylfluorenyl moieties, result from Van der Waals interactions involving the fluorene ligands and C···H–C hydrogen bonds as revealed by Hirshfeld Surfaces. This material features antiferromagnetic exchange interactions as revealed by the magnetic susceptibility as a function of the temperature.

Rb2CaCu6(PO4)4O2, a novel oxophosphate with a shchurovskyite-type topology: synthesis, structure, magnetic properties and crystal chemistry of rubidium copper phosphates

2019 ◽  
Vol 75 (5) ◽  
pp. 903-913
Author(s):  
Sergey M. Aksenov ◽  
Elena Yu. Borovikova ◽  
Vladimir S. Mironov ◽  
Natalia A. Yamnova ◽  
Anatoly S. Volkov ◽  
...  
Keyword(s):  
Multicomponent System ◽  
Exchange Interactions ◽  
Magnetic Behavior ◽  
Molar Ratio ◽  
Monoclinic Space Group ◽  
Antiferromagnetic Exchange ◽  
X Ray ◽  
Low Dimensional ◽  
Fierce Competition ◽  
Ordered State

Single crystals of Rb2CaCu6(PO4)4O2 were synthesized by a hydrothermal method in the multicomponent system CuCl2–Ca(OH)2–RbCl–B2O3–Rb3PO4. The synthesis was carried out in the temperature range from 690 to 700 K and at the general pressure of 480–500 atm [1 atm = 101.325 kPa] from the mixture in the molar ratio 2CuO:CaO:Rb2O:B2O3:P2O5. The crystals studied by single-crystal X-ray analysis were found to be monoclinic, space group C2, a = 16.8913 (4), b = 5.6406 (1), c = 8.3591 (3) Å, β = 93.919 (3)°, V = 794.57 (4) Å3. The crystal structure of Rb2CaCu6(PO4)4O2 is similar to that of shchurovskyite and dmisokolovite and is based upon a heteropolyhedral open framework formed by polar layers of copper polyhedra linked via isolated PO4 tetrahedra. The presence of well-isolated 2D heteropolyhedral layers in the title compound suggests low-dimensional magnetic behavior which is masked, however, by the fierce competition between multiple ferromagnetic and antiferromagnetic exchange interactions. At T C = 25 K, Rb2CaCu6(PO4)4O2 reaches a magnetically ordered state with large residual magnetization.

Low temperature heat capacity, standard entropy, standard enthalpy and magnetic property: a new 1D CuII coordination polymer incorporating tetrazole-1-acetic acid and p-nitrobenzoic acid

2017 ◽  
Vol 46 (6) ◽  
pp. 1878-1884 ◽  
Author(s):  
Qi Yang ◽  
Jing Ge ◽  
Xin Liu ◽  
Quan Shi ◽  
Hongshan Ke ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Coordination Polymer ◽  
Exchange Interactions ◽  
Standard Entropy ◽  
Antiferromagnetic Exchange ◽  
Property A ◽  
Nitrobenzoic Acid ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity

A new 1D CuII coordination polymer possesses antiferromagnetic exchange interactions, which was confirmed by the low-temperature heat capacity.

scholarly journals Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferromagnetic Heusler alloy

2013 ◽  
Vol 87 (14) ◽  
Author(s):  
K. R. Priolkar ◽  
P. A. Bhobe ◽  
D. N. Lobo ◽  
S. W. D'Souza ◽  
S. R. Barman ◽  
...  
Keyword(s):  
Heusler Alloy ◽  
Exchange Interactions ◽  
Antiferromagnetic Exchange

A Molecular Chain of Four CoII Ions Stabilized by a Tris-Pyridyl/Bis-?-Diketonate Ligand

2009 ◽  
Vol 62 (9) ◽  
pp. 1130 ◽  
Author(s):  
Leoní A. Barrios ◽  
David Aguilà ◽  
Olivier Roubeau ◽  
Keith S. Murray ◽  
Guillem Aromí
Keyword(s):  
Exchange Interactions ◽  
Molecular Chain ◽  
Water Molecules ◽  
Spin Orbit Coupling ◽  
Antiferromagnetic Exchange ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bulk Magnetization ◽  
Hexadentate Ligand

The synthesis and characterization of a tris-pyridyl/bis-β-diketone molecule (H2L) is reported. This compound acts as a hexadentate ligand towards CoII to facilitate the assembly of a tetranuclear molecular chain of closely spaced metals with formula [Co4L2(MeOH)8](NO3)4 (1), which exhibits a very flat [Co4L2]4+ platform, as determined by single-crystal X-ray diffraction crystallography. Complex 1 readily exchanges axial methanol ligands with water molecules. The bulk magnetization of the resulting hydrate, 1a, shows that the metals in the [Co4L2]4+ moiety exhibit spin-orbit coupling and antiferromagnetic exchange interactions.

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