scholarly journals Quantum tunnelling of the magnetisation in single-molecule magnet isotopologue dimers

2019 ◽  
Vol 10 (19) ◽  
pp. 5138-5145 ◽  
Author(s):  
Eufemio Moreno-Pineda ◽  
Gheorghe Taran ◽  
Wolfgang Wernsdorfer ◽  
Mario Ruben
Keyword(s):  
Low Temperature ◽  
Field Dependence ◽  
Single Molecule ◽  
Low Temperatures ◽  
Relaxation Rates ◽  
Nuclear Spins ◽  
Magnetic Studies ◽  
Single Molecule Magnet ◽  
Quantum Tunnelling ◽  
Process Observation

Low-temperature magnetic studies of two isotopologues dimers, with and without nuclear spins, reveal that, at very low temperatures, the nuclear spin facilitates the coupling to the phonon bath enhancing the direct relaxation process; observation reflected in the temperature and field dependence of the relaxation rates, whilst at higher temperatures the effect of the nuclear spins is less relevant.

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.

Recent advances in lanthanide coordination polymers and clusters with magnetocaloric effect or single-molecule magnet behavior

2021 ◽  
Author(s):  
Jun-Jie Hu ◽  
Yan Peng ◽  
Sui-Jun Liu ◽  
He-Rui Wen
Keyword(s):  
Quantum Computing ◽  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Coordination Polymers ◽  
Single Molecule ◽  
Information Storage ◽  
Lanthanide Ions ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Lanthanide Coordination Polymers

The molecular magnetorefrigerant materials for low-temperature magnetic refrigeration and single-molecule magnets for high-density information storage and quantum computing have received extensive attention from chemists and magnetic experts. Lanthanide ions with...

Structures, fluorescence properties and magnetic properties of a series of rhombus-shaped LnIII4 clusters: magnetocaloric effect and single-molecule-magnet behavior

2019 ◽  
Vol 43 (33) ◽  
pp. 12941-12949 ◽  
Author(s):  
Wen-Min Wang ◽  
Li Zhang ◽  
Xian-Zhen Li ◽  
Li-Yuan He ◽  
Xin-Xin Wang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetocaloric Effect ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Magnetic Refrigeration ◽  
Fluorescence Properties ◽  
Relaxation Processes ◽  
Magnetic Studies ◽  
Single Molecule Magnet ◽  
Slow Magnetic Relaxation

A family LnIII4 clusters were successfully synthesized and structurally characterized. Magnetic studies show that Gd4 cluster displays magnetic refrigeration, while Dy4 cluster demonstrates two distinct slow magnetic relaxation processes.

scholarly journals High temperature quantum tunnelling of magnetization and thousand kelvin anisotropy barrier in a Dy2 single-molecule magnet

2021 ◽  
Author(s):  
Haipeng Wu ◽  
Min Li ◽  
Zhengqiang Xia ◽  
Vincent Montigaud ◽  
Olivier Cador ◽  
...  
Keyword(s):  
High Temperature ◽  
Crystal Field ◽  
Single Molecule ◽  
Magnetic Hysteresis ◽  
Single Molecule Magnet ◽  
Quantum Tunnelling ◽  
Field Environment

The control of the crystal field environment within the cis/trans stereoisomers allowed the observation of a significantly enhanced anisotropy barrier to 1300 K and magnetic hysteresis opened up to 16 K.

Low-Temperature Magnetic Force Microscopy on Single Molecule Magnet-Based Microarrays

Nano Letters ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 1899-1905 ◽  
Author(s):  
Michele Serri ◽  
Matteo Mannini ◽  
Lorenzo Poggini ◽  
Emilio Vélez-Fort ◽  
Brunetto Cortigiani ◽  
...  
Keyword(s):  
Low Temperature ◽  
Single Molecule ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Single Molecule Magnet ◽  
Force Microscopy

scholarly journals Exchange-bias quantum tunnelling in a CO2-based Dy4-single molecule magnet

2017 ◽  
Vol 8 (2) ◽  
pp. 1178-1185 ◽  
Author(s):  
Eufemio Moreno Pineda ◽  
Yanhua Lan ◽  
Olaf Fuhr ◽  
Wolfgang Wernsdorfer ◽  
Mario Ruben
Keyword(s):  
Single Molecule ◽  
Exchange Bias ◽  
Organic Base ◽  
Single Molecule Magnet ◽  
Quantum Tunnelling

Herein the description of a CO2-based single molecule magnet, obtained through CO2 absorption in the presence of an organic base and a lanthanide is presented.

scholarly journals Bis-cyclooctatetraenyl Thulium(II): Highly Reducing Lanthanide Sandwich Single Molecule Magnets

2020 ◽  
Author(s):  
Jules Moutet ◽  
jules Schleinitz ◽  
Leo La Droitte ◽  
Maxime Tricoire ◽  
Frédéric Gendron ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Molecule ◽  
Single Electron Transfer ◽  
Small Molecule Activation ◽  
Sandwich Complex ◽  
Magnetic Studies ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Divalent Lanthanide ◽  
Reliable Basis

Divalent lanthanide organometallics are well known highly reducing compounds usually used for single electron transfer reactivity and small molecule activation. Thus, their very reactive nature prevented for many years the study of their physical properties, such as magnetic studies on a reliable basis. In this article, the access to rare organometallic sandwich compounds of Tm<sup>II</sup> with the cyclooctatetraenyl (Cot) ligand impacts on the use of divalent organolanthanide compounds as an additional strategy for the design of performing Single Molecule Magnets (SMM). Herein, the first divalent thulium sandwich complex with f<sup>13</sup> configuration behaving as a Single Molecule Magnet in absence of DC field is highlighted.

Modulating single-molecule magnet behavior towards multiple magnetic relaxation processes through structural variation in Dy4 clusters

2018 ◽  
Vol 5 (8) ◽  
pp. 1876-1885 ◽  
Author(s):  
Wen-Min Wang ◽  
Xiao-Min Kang ◽  
Hai-Yun Shen ◽  
Zhi-Lei Wu ◽  
Hong-Ling Gao ◽  
...  
Keyword(s):  
Schiff Base ◽  
Single Molecule ◽  
Schiff Base Ligand ◽  
Magnetic Relaxation ◽  
Structural Variation ◽  
Slow Relaxation ◽  
Relaxation Processes ◽  
Magnetic Studies ◽  
Single Molecule Magnet

Three Dy4 clusters based on a flexible and attractive Schiff base ligand HL have been synthesized, and they showed different tetranuclear core arrangements. Magnetic studies reveal that clusters 1–3 display distinct slow relaxation of magnetization.

A series of [2 × 2] square grid LnIII4 clusters: a large magnetocaloric effect and single-molecule-magnet behavior

2019 ◽  
Vol 43 (19) ◽  
pp. 7419-7426 ◽  
Author(s):  
Wen-Min Wang ◽  
Xian-Zhen Li ◽  
Li Zhang ◽  
Jia-Li Chen ◽  
Jun-Hua Wang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Magnetocaloric Effect ◽  
Single Molecule ◽  
Schiff Base Ligand ◽  
Relaxation Behavior ◽  
Slow Relaxation ◽  
Magnetic Studies ◽  
Single Molecule Magnet ◽  
Square Grid

Four new [2 × 2] square grid LnIII4 clusters were successfully synthesized by employing a multidentate chelating Schiff base ligand. Magnetic studies showed that cluster 1 displays a larger magnetocaloric effect (−ΔSm = 34.46 J kg−1 K−1 for ΔH = 7.0 T at 2.0 K), while 3 exhibits slow relaxation behavior under a zero dc field, with ΔE/kB of 42.76 K and τ0 of 1.02 × 10−6 s.

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