Significant Increase of the Barrier Energy for Magnetization Reversal of a Single-4f-Ionic Single-Molecule Magnet by a Longitudinal Contraction of the Coordination Space

2007 ◽  
Vol 46 (18) ◽  
pp. 7250-7252 ◽  
Author(s):  
Satoshi Takamatsu ◽  
Tadahiko Ishikawa ◽  
Shin-ya Koshihara ◽  
Naoto Ishikawa
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Longitudinal Contraction ◽  
Single Molecule Magnet ◽  
Barrier Energy

Exchange-Biasing in a Dinuclear Dysprosium(III) Single-Molecule Magnet with a Large Energy Barrier for Magnetization Reversal

2019 ◽  
Author(s):  
Tian Han ◽  
Marcus J. Giansiracusa ◽  
Zi-Han Li ◽  
You-Song Ding ◽  
Nicholas F. Chilton ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Magnetic Hysteresis ◽  
Large Energy ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
Single Molecule Magnet ◽  
Exchange Biasing

A dichlorido-bridged dinuclear dysprosium(III) single-molecule magnet [Dy<sub>2</sub>L<sub>2</sub>(<i>µ</i>-Cl)<sub>2</sub>(THF)<sub>2</sub>] has been made using a diamine-bis(phenolate) ligand, H<sub>2</sub>L. Magnetic studies show an energy barrier for magnetization reversal (<i>U</i><sub>eff</sub>) around 1000 K. Exchange-biasing effect is clearly seen in magnetic hysteresis with steps up to 4 K. <i>Ab</i> initio calculations exclude the possibility of pure dipolar origin of this effect leading to the conclusion that super-exchange <i>via</i> the chloride bridging ligands is important.

scholarly journals A dichlorido-bridged dinuclear Dy(iii) single-molecule magnet with an effective energy barrier larger than 600 K

2019 ◽  
Vol 55 (55) ◽  
pp. 7930-7933 ◽  
Author(s):  
Tian Han ◽  
You-Song Ding ◽  
Zi-Han Li ◽  
Ke-Xin Yu ◽  
Yuan-Qi Zhai ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Large Energy ◽  
Effective Energy ◽  
Single Molecule Magnet

A large energy barrier for magnetization reversal of about 623 K is observed in a dichlorido-bridged Dy(iii) dimer.

Mn21Dy Cluster with a Record Magnetization Reversal Barrier for a Mixed 3d/4f Single-Molecule Magnet

2011 ◽  
Vol 50 (2) ◽  
pp. 421-423 ◽  
Author(s):  
Constantina Papatriantafyllopoulou ◽  
Wolfgang Wernsdorfer ◽  
Khalil A. Abboud ◽  
George Christou
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Single Molecule Magnet

Single-molecule magnet [Tb(hfac)3(2pyNO)] (2pyNO = t-butyl 2-pyridyl nitroxide) with a relatively high barrier of magnetization reversal

2013 ◽  
Vol 42 (38) ◽  
pp. 13968 ◽  
Author(s):  
Rina Murakami ◽  
Takayuki Ishida ◽  
Shunsuke Yoshii ◽  
Hiroyuki Nojiri
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Single Molecule Magnet

A Model of Single Molecule Magnet Behavior of the [CuIILTbIII(hfac)2]2 Cluster

2008 ◽  
Vol 273-276 ◽  
pp. 227-232
Author(s):  
S. Ostrovsky ◽  
O. Reu ◽  
A. Palii ◽  
Anatoly Yakovlevich Fishman ◽  
Valentin Yakovlevich Mitrofanov ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Experimental Evidence ◽  
Exchange Interaction ◽  
Crystal Field ◽  
Single Molecule ◽  
Magnetization Reversal ◽  
Total Angular Momentum ◽  
Mean Value ◽  
Single Molecule Magnet ◽  
The Mean

We report a model for the explanation of the single molecule magnet behavior of the [CuIILTbIII(hfac)2]2 cluster. The model takes into account the crystal field acting on the TbIII –ion and the exchange interaction between the TbIII and CuII ions. The energies of the low-lying levels are shown to increase with the decrease of the mean value of the z-projection of the total angular momentum of the cluster, thus forming a barrier for magnetization reversal that is in accordance with the experimental evidence.

Is Lanthanide-Transition Metal Direct Bond a Route to Achieving New Generation {3d-4f} SMMs?

2021 ◽  
Author(s):  
Gopalan Rajaraman ◽  
Abinash Swain ◽  
Asmita Sen
Keyword(s):  
Transition Metal ◽  
Single Molecule ◽  
Magnetization Reversal ◽  
Single Molecule Magnet ◽  
Quantum Tunnelling ◽  
Direct Bond ◽  
New Generation

One of the main challenges in this area of Single Molecule Magnet is quenching quantum tunnelling of magnetization (QTM), which often undercut the magnetization reversal barrier. Among several strategies employed,...

scholarly journals Multiple Magnetization Reversal Channels Observed in a 3d-4f Single Molecule Magnet

2016 ◽  
Vol 2 (2) ◽  
pp. 27 ◽  
Author(s):  
Asma Amjad ◽  
Albert Figuerola ◽  
Andrea Caneschi ◽  
Lorenzo Sorace
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Single Molecule Magnet

scholarly journals Harnessing Colossal Magnetic Anisotropy in Sandwiched 3d^2-Metallocenes

2021 ◽  
Author(s):  
Sakshi Nain ◽  
Rishu Khurana ◽  
Md. Ehesan Ali
Keyword(s):  
Transition Metal ◽  
Magnetic Anisotropy ◽  
Ab Initio Calculations ◽  
Single Molecule ◽  
Magnetization Reversal ◽  
Single Molecule Magnet ◽  
Molecular Systems ◽  
Sandwiched Structure ◽  
D Values ◽  
Quantum Technology

Single-molecule magnet (SMM) based quantum technology is gaining attentions in recent years with growing focus on achieving higher barrier of magnetization reversal. Metallocenes owing unique sandwiched-structure, assure themselves as plausible molecular systems for development of novel SMMs. Here in this work, we have explicitly investigated metallocenes of first row transition metal elements, along with their one electron oxidized (cationic) and reduced (anionic) analogues, for their magnetic anisotropies (D) adopting multi-reference ab initio calculations. Herein, we report the unprecedented high D values for 3d^2 systems among all the 3d-metallocenes.

Exchange-Biasing in a Dinuclear Dysprosium(III) Single-Molecule Magnet with a Large Energy Barrier for Magnetization Reversal

2019 ◽  
Author(s):  
Tian Han ◽  
Marcus J. Giansiracusa ◽  
Zi-Han Li ◽  
You-Song Ding ◽  
Nicholas F. Chilton ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Magnetic Hysteresis ◽  
Large Energy ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
Single Molecule Magnet ◽  
Exchange Biasing

A dichlorido-bridged dinuclear dysprosium(III) single-molecule magnet [Dy<sub>2</sub>L<sub>2</sub>(<i>µ</i>-Cl)<sub>2</sub>(THF)<sub>2</sub>] has been made using a diamine-bis(phenolate) ligand, H<sub>2</sub>L. Magnetic studies show an energy barrier for magnetization reversal (<i>U</i><sub>eff</sub>) around 1000 K. Exchange-biasing effect is clearly seen in magnetic hysteresis with steps up to 4 K. <i>Ab</i> initio calculations exclude the possibility of pure dipolar origin of this effect leading to the conclusion that super-exchange <i>via</i> the chloride bridging ligands is important.

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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