Three tetracoordinate Co(ii) complexes [Co(biq)X2] (X = Cl, Br, I) with easy-plane magnetic anisotropy as field-induced single-molecule magnets

2015 ◽  
Vol 44 (40) ◽  
pp. 17565-17571 ◽  
Author(s):  
L. Smolko ◽  
J. Černák ◽  
M. Dušek ◽  
J. Miklovič ◽  
J. Titiš ◽  
...  
Keyword(s):  
External Field ◽  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Easy Plane ◽  
Single Molecule Magnets ◽  
Mononuclear Complexes ◽  
Superparamagnetic Behaviour

Three mononuclear complexes [CoII(biq)X2] (biq = 2,2′-biquinoline; X = Cl, Br, I) possess a sizable magnetic anisotropy, and they display a superparamagnetic behaviour in an applied external field that culminates between BDC = 0.2–0.3 T.

The localized electron: magnetic properties

2018 ◽  
Author(s):  
Jean-Pierre Launay ◽  
Michel Verdaguer
Keyword(s):  
Single Molecule ◽  
Model Systems ◽  
Ferromagnetic Coupling ◽  
Single Chain ◽  
Single Molecule Magnets ◽  
Magnetic Systems ◽  
Orbital Interactions ◽  
Prussian Blue Analogues ◽  
Mononuclear Complexes

After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

Magnetic anisotropy on demand exploiting high-pressure as remote control: an ab initio proof-of-concept

2021 ◽  
Author(s):  
Matteo Briganti ◽  
Federico Totti
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Remote Control ◽  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Single Molecule ◽  
Boiling Temperature ◽  
Proof Of Concept ◽  
Single Molecule Magnets ◽  
On Demand

Lanthanide based single molecule magnets have recently become very promising systems for creating single molecule device working at high temperature (nitrogen boiling temperature). However, the variation of direction of the...

Enhanced energy barriers triggered by magnetic anisotropy modulation via tuning the functional groups on the bridging ligands in Dy2 single-molecule magnets

2018 ◽  
Vol 47 (42) ◽  
pp. 15197-15205 ◽  
Author(s):  
Yaru Qin ◽  
Yu Jing ◽  
Yu Ge ◽  
Wei Liu ◽  
Yahong Li ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Functional Groups ◽  
Single Molecule ◽  
Energy Barrier ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Bridging Ligands

Two dinuclear dysprosium complexes of 1 and 2 have been synthesized and both of them exhibit SMM behavior. The energy barrier is enhanced ca. 35 K by elaborately tuning the backbones of the ligands.

scholarly journals Polarized Neutron Diffraction: An Excellent Tool to Evidence the Magnetic Anisotropy—Structural Relationships in Molecules

2021 ◽  
Vol 7 (12) ◽  
pp. 158
Author(s):  
Dominique Luneau ◽  
Béatrice Gillon
Keyword(s):  
Neutron Diffraction ◽  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Coordination Compounds ◽  
Single Molecule Magnets ◽  
Structural Relationships ◽  
Polarized Neutron ◽  
The Individual ◽  
The Relationship ◽  
Excellent Tool

This publication reviews recent advances in polarized neutron diffraction (PND) studies of magnetic anisotropy in coordination compounds comprising d or f elements and having different nuclearities. All these studies illustrate the extent to which PND can provide precise and direct information on the relationship between molecular structure and the shape and axes of magnetic anisotropy of the individual metal sites. It makes this experimental technique (PND) an excellent tool to help in the design of molecular-based magnets and especially single-molecule magnets for which strong uniaxial magnetic anisotropy is required.

Electronic control of strong magnetic anisotropy in Co-based single-molecule magnets

2021 ◽  
Vol 104 (13) ◽  
Author(s):  
Zahra Hooshmand ◽  
Jie-Xiang Yu ◽  
Hai-Ping Cheng ◽  
Mark R Pederson
Keyword(s):  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Electronic Control ◽  
Single Molecule Magnets

Single-Molecule Magnets of Ferrous Cubes:  Structurally Controlled Magnetic Anisotropy

2004 ◽  
Vol 126 (28) ◽  
pp. 8805-8812 ◽  
Author(s):  
Hiroki Oshio ◽  
Norihisa Hoshino ◽  
Tasuku Ito ◽  
Motohiro Nakano
Keyword(s):  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Single Molecule Magnets
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