Single-molecule magnets: a molecular approach to nanoscale magnetic materials

Polyhedron ◽  
2005 ◽  
Vol 24 (16-17) ◽  
pp. 2065-2075 ◽  
Author(s):  
George Christou
Keyword(s):  
Magnetic Materials ◽  
Single Molecule ◽  
Molecular Approach ◽  
Single Molecule Magnets

Hetero-tri-spin systems: an alternative stairway to the Single Molecule Magnets heaven?

2021 ◽  
Author(s):  
Marius Andruh ◽  
Federico Totti ◽  
Matteo Briganti
Keyword(s):  
Coordination Chemistry ◽  
Magnetic Materials ◽  
Single Molecule ◽  
Spin Systems ◽  
Single Molecule Magnets

The search for molecule-based magnetic materials has stimulated over the years the development of an extremely rich coordination chemistry. Various combinations of spin carriers have been investigated and illustrated by...

Magnetic Materials: X-Ray Magnetic Circular Dichroism Picks out Single-Molecule Magnets Suitable for Nanodevices (Adv. Mater. 2/2009)

2009 ◽  
Vol 21 (2) ◽  
pp. NA-NA
Author(s):  
Matteo Mannini ◽  
Francesco Pineider ◽  
Philippe Sainctavit ◽  
Loïc Joly ◽  
Arantxa Fraile-Rodríguez ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Magnetic Materials ◽  
Single Molecule ◽  
Magnetic Circular Dichroism ◽  
Single Molecule Magnets ◽  
X Ray ◽  
Circular Dichroïsm

Recent Advances in Molecular Magnetic Materials

2009 ◽  
Vol 62 (9) ◽  
pp. 1081 ◽  
Author(s):  
Keith S. Murray
Keyword(s):  
Magnetic Materials ◽  
Single Molecule ◽  
Three Dimensional ◽  
Single Molecule Magnets ◽  
Coupled Clusters ◽  
Framework Materials ◽  
Range Magnetic Order ◽  
Molecular Magnetic Materials ◽  
Long Range Magnetic Order ◽  
Molecular Computers

This review describes advances made in three areas of molecular magnetic materials of the types A: extended frameworks (coordination polymers) showing long-range magnetic order, B: spin-coupled clusters with emphasis on single molecule magnets and (n × n) grid species, C: polynuclear spin-switching (spin crossover) compounds of FeII with emphasis on dinuclear compounds and one-dimensional (1D) and three-dimensional (3D) (framework) materials, including porous ‘hybrid’ systems. The work of the author and his group is largely used to provide examples, together with results from other groups and collaborators that are included for comparison and completeness. Supramolecular aspects such as cluster–cluster and chain–chain interactions are discussed where relevant. A brief discussion is also given of the recent studies, carried out elsewhere, dealing with aspects of spintronics and the possible future relevance to molecular computers (type B materials) and with memory and other device possibilities (type C materials)

Seeking Magneto-Structural Correlations in Easily Tailored Pentagonal Bipyramid Dy(III) Single-Ion Magnets

2019 ◽  
Author(s):  
Guo-Zhang Huang ◽  
Ze-Yu Ruan ◽  
Jie-Yu Zheng ◽  
Yan-Cong Chen ◽  
Si-Guo Wu ◽  
...  
Keyword(s):  
Single Molecule ◽  
Structural Engineering ◽  
Magnetic Hysteresis ◽  
Sweep Rate ◽  
Coordination Bond ◽  
Pentagonal Bipyramid ◽  
Single Molecule Magnets ◽  
Crystal Field Theory ◽  
Bond Angles ◽  
Axial Coordination

<p><a></a>Controlling molecular magnetic anisotropy via structural engineering is delicate and fascinating, especially for single-molecule magnets (SMMs). Herein a family of dysprosium single-ion magnets (SIMs) sitting in pentagonal bipyramid geometry have been synthesized with the variable-size terminal ligands and counter anions, through which the subtle coordination geometry of Dy(III) can be finely tuned based on the size effect. The effective energy barrier (Ueff) successfully increases from 439 K to 632 K and the magnetic hysteresis temperature (under a 200 Oe/s sweep rate) raises from 11 K to 24 K. Based on the crystal-field theory, a semi-quantitative magneto-structural correlation deducing experimentally for the first time is revealed that the Ueff is linearly proportional to the structural-related value S2<sup>0</sup> corresponding to the axial coordination bond lengths and the bond angles. Through the evaluation of the remanent magnetization from hysteresis, quantum tunneling of magnetization (QTM) is found to exhibit negative correlation with the structural-related value S<sub>tun</sub> corresponding to the axial coordination bond angles.<br></p>

Correlating Blocking Temperatures in Single Molecule Magnets with Raman Relaxation

2018 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas Kostopoulos ◽  
George F. S. Whitehead ◽  
David Collison ◽  
Floriana Tuna ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Single Molecule ◽  
Energy Barrier ◽  
Thermal Relaxation ◽  
Relaxation Mechanism ◽  
Blocking Temperature ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Key Parameter

We report a six coordinate DyIII single-molecule magnet<br>(SMM) with an energy barrier of 1110 K for thermal relaxation of<br>magnetization. The sample shows no retention of magnetization<br>even at 2 K and this led us to find a good correlation between the<br>blocking temperature and the Raman relaxation regime for SMMs.<br>The key parameter is the relaxation time (𝜏<sub>switch</sub>) at the point where<br>the Raman relaxation mechanism becomes more important than<br>Orbach.

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