Molecular nanomagnets

2017 ◽  
Author(s):  
W. Wernsdorfer
Keyword(s):  
Molecular Electronics ◽  
Single Molecule ◽  
Quantum Dynamics ◽  
Spin Model ◽  
Photon Absorption ◽  
Single Molecule Magnets ◽  
Molecular Nanomagnets ◽  
Quantum Properties ◽  
Molecular Spintronics ◽  
Quantum Phenomena

This article describes the quantum phenomena observed in molecular nanomagnets. Molecular nanomagnets, or single-molecule magnets (SMMs), provides a fundamental link between spintronics and molecular electronics. SMMs combine the classic macroscale properties of a magnet with the quantum properties of a nanoscale entity. The resulting field, molecular spintronics, aims at manipulating spins and charges in electronic devices containing one or more molecules. This article first considers molecular nanomagnets and the giant spin model for nanomagnets before discussing the quantum dynamics of a dimer of nanomagnets, resonant photon absorption in Cr7Ni antiferromagnetic rings, and photon-assisted tunnelling in a single-molecule magnet. It also examines environmental decoherence effects in nanomagnets and concludes by highlighting the new trends towards molecular spintronics using junctions and nano-SQUIDs.

Covalently Linked Dimer of Mn3 Single-Molecule Magnets and Retention of Its Structure and Quantum Properties in Solution

2015 ◽  
Vol 137 (22) ◽  
pp. 7160-7168 ◽  
Author(s):  
Tu N. Nguyen ◽  
Muhandis Shiddiq ◽  
Tuhin Ghosh ◽  
Khalil A. Abboud ◽  
Stephen Hill ◽  
...  
Keyword(s):  
Single Molecule ◽  
Single Molecule Magnets ◽  
Quantum Properties ◽  
Covalently Linked

scholarly journals Quantum dynamics of exchange biased single-molecule magnets

2004 ◽  
Vol 272-276 ◽  
pp. 1037-1041 ◽  
Author(s):  
W. Wernsdorfer ◽  
N. Aliaga-Alcalde ◽  
R. Tiron ◽  
D.N. Hendrickson ◽  
G. Christou
Keyword(s):  
Single Molecule ◽  
Quantum Dynamics ◽  
Single Molecule Magnets

scholarly journals Combining Molecular Spintronics with Electron Paramagnetic Resonance: The Path Towards Single-Molecule Pulsed Spin Spectroscopy

2020 ◽  
Vol 51 (11) ◽  
pp. 1357-1409
Author(s):  
Michael Slota ◽  
Lapo Bogani
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Quantum Transport ◽  
Single Molecule ◽  
Transport Systems ◽  
Resonance Spectroscopy ◽  
Single Molecule Magnets ◽  
Paramagnetic Resonance ◽  
Single Molecule Level ◽  
Molecular Spintronics ◽  
Electron Paramagnetic

AbstractWe provide a perspective on how single-molecule magnets can offer a platform to combine quantum transport and paramagnetic spectroscopy, so as to deliver time-resolved electron paramagnetic resonance at the single-molecule level. To this aim, we first review the main principles and recent developments of molecular spintronics, together with the possibilities and limitations offered by current approaches, where interactions between leads and single-molecule magnets are important. We then review progress on the electron quantum coherence on devices based on molecular magnets, and the pulse sequences and techniques necessary for their characterization, which might find implementation at the single-molecule level. Finally, we highlight how some of the concepts can also be implemented by including all elements into a single molecule and we propose an analogy between donor–acceptor triads, where a spin center is sandwiched between a donor and an acceptor, and quantum transport systems. We eventually discuss the possibility of probing spin coherence during or immediately after the passage of an electron transfer, based on examples of transient electron paramagnetic resonance spectroscopy on molecular materials.

Near-infrared emissive Er(iii) and Yb(iii) molecular nanomagnets in metal–organic chains functionalized by octacyanidometallates(iv)

2019 ◽  
Vol 6 (9) ◽  
pp. 2423-2434 ◽  
Author(s):  
Robert Jankowski ◽  
Jakub J. Zakrzewski ◽  
Olga Surma ◽  
Shin-ichi Ohkoshi ◽  
Szymon Chorazy ◽  
...  
Keyword(s):  
Single Molecule ◽  
Crucial Role ◽  
Near Infrared ◽  
Single Molecule Magnets ◽  
Molecular Nanomagnets ◽  
Metal Organic ◽  
Nir Emission

Photoluminescent single-molecule magnets are formed in lanthanide(pyrazine N,N′-dioxide) chains with octacyanidometallate(iv) coordination branches playing a crucial role in sensitized NIR emission.

scholarly journals Single molecule magnets sublimated on conducting and magnetic substrates

2016 ◽  
Author(s):  
Luigi Malavolti
Keyword(s):  
Single Molecule ◽  
Large Scale ◽  
Single Molecule Magnets ◽  
Magnetic Characterization ◽  
Single Molecule Level ◽  
Spintronic Devices ◽  
Magnetic Surfaces ◽  
Quantum Phenomena ◽  
The Way

Single Molecule Magnets (SMMs) showing bistability and quantum phenomena are promising candidates for spintronic applications. In recent years, the study of hybrid surfaces composed of SMMs on conductive and magnetic surfaces has attracted increasing interest. In this work the preparation of hybrid surfaces made by terbium bis(phthalocyaninato) and Fe4 SMMs is reported. The surfaces were structurally and magnetically characterized by means of laboratory and large scale facility techniques. This investigation has provided interesting hints towards their application in spintronic devices and has paved the way for the magnetic characterization of Fe4 at the single molecule level.

scholarly journals Near-Infrared Emissive Cyanido-Bridged {YbFe2} Molecular Nanomagnets Sensitive to the Nitrile Solvents of Crystallization

2021 ◽  
Vol 7 (6) ◽  
pp. 79
Author(s):  
Michal Liberka ◽  
Kseniia Boidachenko ◽  
Jakub J. Zakrzewski ◽  
Mikolaj Zychowicz ◽  
Junhao Wang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Self Assembly ◽  
Near Infrared ◽  
Magnetic Data ◽  
Phonon Modes ◽  
Single Molecule Magnets ◽  
Molecular Nanomagnets ◽  
Dipole Interactions ◽  
Raman Process ◽  
Slow Magnetic Relaxation

One of the pathways toward luminescent single-molecule magnets (SMMs) is realized by the self-assembly of lanthanide(3+) ions with cyanido transition metal complexes. We report a novel family of emissive SMMs, {YbIII(4-pyridone)4[FeII(phen)2(CN)2]2}(CF3SO3)3·solv (solv = 2MeCN, 1·MeCN; 2AcrCN, 1·AcrCN; 2PrCN, 1·PrCN; 2MalCN·1MeOH; 1·MalCN; MeCN = acetonitrile, AcrCN = acrylonitrile, PrCN = propionitrile, MalCN = malononitrile). They are based on paramagnetic YbIII centers coordinating diamagnetic [FeII(phen)2(CN)2] metalloligands but differ in the nitrile solvents of crystallization. They exhibit a field-induced slow magnetic relaxation dominated by a Raman process, without an Orbach relaxation as indicated by AC magnetic data and the ab initio calculations. The Raman relaxation is solvent-dependent as represented by the power “n” of the BRamanTn contribution varying from 3.07(1), to 2.61(1), 2.37(1), and 1.68(4) for 1·MeCN, 1·PrCN, 1·AcrCN, and 1·MalCN, respectively, while the BRaman parameter adopts the opposite trend. This was correlated with the variation of phonon modes schemes, including the number of available vibrational modes and their energies, dependent on the increasing complexity of the applied nitrile. 1·MeCN and 1·MalCN show the additional T-independent relaxation assignable to dipole-dipole interactions as confirmed by its suppression in 1·AcrCN and 1·PrCN revealing longer Yb–Yb distances and the disappearance in the LuIII-diluted 1·MeCN@Lu. All compounds exhibit YbIII–centered near-infrared photoluminescence sensitized by organic ligands.

scholarly journals SHG-active NIR-emissive molecular nanomagnets generated in layered neodymium(III)-octacyanidometallate(IV) frameworks

2021 ◽  
Author(s):  
Robert Jankowski ◽  
Jakub J. Zakrzewski ◽  
Mikolaj Zychowicz ◽  
Junhao Wang ◽  
Yurie Oki ◽  
...  
Keyword(s):  
Single Molecule ◽  
Electronic Transitions ◽  
Single Molecule Magnets ◽  
Molecular Nanomagnets ◽  
Coordination Systems

Lanthanide(III) single-molecule magnets (Ln-SMMs) offer the fruitful conjunction of magnetic and photoluminescent properties originating from their single-ion anisotropy and emissive f-f electronic transitions. The flexibility of lanthanide(III)-based coordination systems is...

scholarly journals Organometallic Single-Ion Magnets

2014 ◽  
Vol 70 (a1) ◽  
pp. C274-C274
Author(s):  
Bing-Wu Wang ◽  
Zhe-Ming Wang ◽  
Song Gao
Keyword(s):  
Single Molecule ◽  
Basic Research ◽  
Information Storage ◽  
Tunneling Effect ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Molecular Nanomagnets ◽  
Design And Synthesis ◽  
Potential Applications ◽  
Slow Magnetic Relaxation

The single-molecule magnets (SMMs) are attracting the increasing interesting due to their potential applications in high density information storage, quantum computing, molecular spintronics, and magnetic refrigeration. This field provides scientists a possible access into the crossover of the classical and quantum world, and a wonderful model to study the fascinating magnetic properties between microscopic and macroscopic materials, such as slow magnetization relaxation and quantum tunneling effect. After the milestone discovery of the first single-molecule magnets (SMMs) Mn12ac, many new SMMs were structurally and magnetically characterized. The most studied systems are mainly traditional coordination compounds with polynuclear structures. However, for the difficulties in the control of magnetic anisotropy and exchange coupling interactions of the cluster-type molecules, Mn12ac molecule is still one of the most important SMMs with the high relaxation barrier. From 2011 [1-3], we explored an organometallic sandwich molecule, Cp*ErCOT(Cp* = pentamethylcyclopenta-dienide; COT = cyclooctatetraenide), which behaves as a single-ion magnets, into the field of molecular nanomagnets. It opened a door of SMMs to the chemists in organometallic chemistry. Recently, we found some new sandwich or half-sandwich lanthanide organometallic molecules could also show the slow relaxation of magnetization. We hope these systems can provide new understandings of slow magnetic relaxation and new clues on the design and synthesis of molecular nanomagnets. This work was supported by NSFC, the National Basic Research Program of China.

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