Search results for "Magnetic Relaxation"

showing 6 items of 16 documents

Single-Molecule-Magnet Fe Fe and Antiferromagnetic Fe Coordination Clusters

2019

Supported by endogenous (part of the ligand, in-built) phenoxo bridges provided by the ligand 2,6-bis[{{(5-bromo-2-hydroxybenzyl)}{(2-(pyridylethyl)}amino}methyl]-4-methylphenol) (H3L), in its deprotonated form, exogenous (not part of the ligand, externally added or generated) oxo-/hydroxo- and acetato-bridged [FeII4FeIII2(O)2(O2CMe)4(L)2]·4Et2O (1) and [FeIII4(OH)2(O2CMe)3(L)2](ClO4)·3MeCN·2H2O (2) coordination clusters have been synthesized and structurally characterized. Complexes 1 and 2 have μ4-O and μ3-OH bridges, respectively. Magnetic studies on 1 reveal slow magnetic relaxation below 2 K. Both in-phase ( χ'M) and out-of-phase (χ″M) magnetic susceptibility were found to be frequency…

Spin states010405 organic chemistryChemistryLigand010402 general chemistry01 natural sciencesMagnetic susceptibility0104 chemical sciencesInorganic ChemistryCrystallographyDeprotonationMagnetAntiferromagnetismMagnetic relaxationSingle-molecule magnetPhysical and Theoretical Chemistry
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Single chain magnet behaviour in an enantiopure chiral cobalt(II)–copper(II) one-dimensional compound

2010

The self-assembly of an enantiomerically pure, chiral dianionic oxamatocopper(II) complex with cobalt(II) ions leads to neutral oxamato-bridged heterobimetallic chains that combine chirality and slow magnetic relaxation, providing thus the first example of ‘‘chiral single chain magnets (CSCMs). Ruiz Garcia, Rafael, Rafael.Ruiz@uv.es ; Lloret Pastor, Francisco, Francisco.Lloret@uv.es

StereochemistryHigh Energy Physics::LatticeUNESCO::QUÍMICAchemistry.chemical_elementSingle chainComputer Science::Computational Geometry010402 general chemistry01 natural sciences:QUÍMICA [UNESCO]CatalysisIonMagnetic RelaxationMaterials ChemistryMagnetic relaxation[CHIM.COOR]Chemical Sciences/Coordination chemistrySelf-assembly ; Dianionic oxamatocopper ; Cobalt ; Ions ; Magnetic RelaxationComputingMilieux_MISCELLANEOUSIons010405 organic chemistryUNESCO::QUÍMICA::Química inorgánicaHigh Energy Physics::PhenomenologyMetals and AlloysGeneral ChemistrySelf-assemblyCobalt:QUÍMICA::Química inorgánica [UNESCO]Copper3. Good health0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCrystallographyEnantiopure drugchemistryMagnetCeramics and CompositesDianionic oxamatocopperChirality (chemistry)Cobalt
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Time evolution of the microwave second-order response of YBaCuO powder

2003

Transient effects in the microwave second-order response of YBaCuO powder are investigated. The time evolution of the second harmonic signal has been measured for about 300 s after the sample had been exposed to variations of the DC magnetic field. We show that in different time scales the transient response has different origin. In the time scale of milliseconds the transient response of samples in the critical state is ascribable to processes of flux redistribution induced by the switching on/off of the microwave field. At longer times, the time evolution of the second harmonic signal can be ascribed to motion of fluxons induced by the variation of the DC magnetic field. In particular, di…

SuperconductivityMillisecondMaterials scienceCondensed matter physicsFluxonCondensed Matter - SuperconductivityTime evolutionEnergy Engineering and Power TechnologySecond-harmonic generationFOS: Physical sciencesCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsMagnetic fieldSuperconductivity (cond-mat.supr-con)Fluxon dynamics Magnetic relaxation Non-linear microwave responseTransient responseElectrical and Electronic EngineeringMicrowave
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Reversible solvatomagnetic switching in a single-ion magnet from an entatic state

2016

We have developed a new strategy for the design and synthesis of multifunctional molecular materials showing reversible magnetic and optical switching.

Thermochromismgenetic structuresSingle ion010405 organic chemistryChemistrychemistry.chemical_elementEntatic stateNanotechnologyGeneral Chemistryequipment and supplies010402 general chemistry01 natural scienceseye diseases0104 chemical sciencesChemistryTransition metalMagnetMagnetic relaxationhuman activitiesCobaltQuantum computerChemical Science
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A Study of the Lack of Slow Magnetic Relaxation in Mononuclear Trigonal Bipyramidal Cobalt(II) Complexes

2021

Trigonal bipyramidal molecular geometryCrystallographyMaterials sciencechemistrylawchemistry.chemical_elementMagnetic relaxationGeneral ChemistryCrystal structureElectron paramagnetic resonanceCobaltlaw.inventionChemistrySelect
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Magnetic Disaccommodation in Manganese Ferrites in the Temperature Region IV

1991

The magnetic relaxation in polycrystalline, nonstoichiometric manganese ferrite samples MnxFe3−xO4 is investigated as a function of the Mn content (0 ≦ x ≦ 1). The analysis of the experimental results shows that in the temperature region IV two different relaxation processes at 285 (IV) and 220 K (IVa) can be distinguished. The process IV exhibits orientational relaxation characteristics and is composed by the superposition of two Debye processes with activation energies close to 0.75 and 0.80 eV whereas relaxation IV a could be associated with vacancy migration through the lattice, but future investigations are necessary to probe this. Es wird die magnetische Relaxation in polykristallinen…

chemistry.chemical_classificationChemistrychemistry.chemical_elementManganese ferriteActivation energyManganeseCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsCrystallographyNuclear magnetic resonanceVacancy defectMagnetic relaxationCrystalliteInorganic compoundSolid solutionPhysica Status Solidi (a)
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