scholarly journals Heterometallic CuII/DyIII 1D chiral polymers: chirogenesis and exchange coupling of toroidal moments in trinuclear Dy3 single molecule magnets

2012 ◽  
Vol 3 (4) ◽  
pp. 1169 ◽  
Author(s):  
Ghenadie Novitchi ◽  
Guillaume Pilet ◽  
Liviu Ungur ◽  
Victor V. Moshchalkov ◽  
Wolfgang Wernsdorfer ◽  
...  
Keyword(s):  
Single Molecule ◽  
Exchange Coupling ◽  
Single Molecule Magnets ◽  
Chiral Polymers

Ligand-Driven Exchange Coupling in ${\rm Mn}_{4}$ Single-Molecule Magnets

2011 ◽  
Vol 47 (10) ◽  
pp. 2429-2432 ◽  
Author(s):  
Nguyen Anh Tuan ◽  
Ngo Thanh Tam ◽  
Nguyen Huy Sinh ◽  
Dam Hieu Chi
Keyword(s):  
Single Molecule ◽  
Exchange Coupling ◽  
Single Molecule Magnets

scholarly journals Computational Design of Mn4 Molecules with Strong Intramolecular Exchange Coupling

2011 ◽  
Vol 21 (2) ◽  
pp. 137
Author(s):  
Nguyen Anh Tuan ◽  
Nguyen Van Thanh ◽  
Tran Thi Thuy Nu ◽  
Nguyen Huy Sinh ◽  
Vu Van Khai ◽  
...  
Keyword(s):  
High Spin ◽  
Single Molecule ◽  
First Principles ◽  
Electronic Structures ◽  
Exchange Coupling ◽  
Computational Design ◽  
First Principles Calculations ◽  
Single Molecule Magnets ◽  
Intramolecular Exchange ◽  
Ferrimagnetic Structure

The geometric and electronic structures of [Mn44+Mn3+3(µ3-L2 -)3(µ3-X -(OAc) - 3(dbm) -3] (L = O, X = F, dbmH = dibenzoyl-methane) molecule has been studied by first-principles calculations. It was shown in our previous paper that the ferrimagnetic structure of Mn$^{4 + }$Mn$^{3 + }_{3}$ molecules is determined by the $\pi $ type hybridization between the $d_{z^2}$ orbitals at the three high-spin Mn$^{3 + }$ ions and the $t_{2g}$ orbitals at the Mn$^{4 + }$ ion by the $p$ orbitals at the $\mu _{3}$-L$^{2 - }$ ions. To design new Mn$^{4 + }$Mn$^{3 + }_{3}$ molecules having much more stable ferrimagnetic state, one approach is suggested. That is controlling the Mn$^{4 + }$-($\mu _{3}$-L$^{2 - })$-Mn$^{3 + }$ exchange pathways by rational variation in $\mu _{3}$-L ligands to strengthen the hybridization between Mn ions. By this ligand variation, $J_{AB}$ can be enhanced by a factor of 3. Our results should facilitate the rational synthesis of new single-molecule magnets.

scholarly journals Three-Axis Anisotropic Exchange Coupling in the Single-Molecule Magnets NEt4[MnIII2(5-Brsalen)2(MeOH)2MIII(CN)6] (M=Ru, Os)

2013 ◽  
Vol 19 (11) ◽  
pp. 3693-3701 ◽  
Author(s):  
Jan Dreiser ◽  
Kasper S. Pedersen ◽  
Alexander Schnegg ◽  
Karsten Holldack ◽  
Joscha Nehrkorn ◽  
...  
Keyword(s):  
Single Molecule ◽  
Exchange Coupling ◽  
Single Molecule Magnets ◽  
Anisotropic Exchange

scholarly journals Exchange coupling in a frustrated trimetric molecular magnet reversed by a 1D nano-confinement

Nanoscale ◽  
2019 ◽  
Vol 11 (22) ◽  
pp. 10615-10621 ◽  
Author(s):  
Oleg Domanov ◽  
Eugen Weschke ◽  
Takeshi Saito ◽  
Herwig Peterlik ◽  
Thomas Pichler ◽  
...  
Keyword(s):  
Single Molecule ◽  
Exchange Coupling ◽  
Magnetic Ordering ◽  
Molecular Magnet ◽  
Single Molecule Magnets

Single-molecule magnets exhibit magnetic ordering due to exchange coupling between localized spin components that makes them primary candidates as nanometric spintronic elements.

Exchange coupling in TbCu and DyCu single-molecule magnets and related lanthanide and vanadium analogs

2012 ◽  
Vol 41 (44) ◽  
pp. 13609 ◽  
Author(s):  
Takayuki Ishida ◽  
Ryo Watanabe ◽  
Kei Fujiwara ◽  
Atsushi Okazawa ◽  
Norimichi Kojima ◽  
...  
Keyword(s):  
Single Molecule ◽  
Exchange Coupling ◽  
Single Molecule Magnets

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>

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