Magnetic Axiality: Design Principles from Molecules to Materials

Harriman, Katie L. M.; Errulat, Dylan; Murugesu, Muralee

doi:10.1016/j.trechm.2019.04.005

Cited by 105 publications

(118 citation statements)

References 94 publications

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“…18 Here we performed a tentative analysis of the dipolar interactions restricting them to the (Dy2) 6 octahedron. Dipolar energy for every pair of Dy 3+ ions was calculated using formula (3).…”

Section: Susceptibility and Magnetizationmentioning

confidence: 99%

“…To date hundreds of coordination compounds of open shell dand f-metals have been shown to exhibit magnetic bistability of a lone metal ion and are referred to as single ion magnets (SIMs) with potential applications in super-dense information recording, molecular electronics, spintronics, and quantum computing. [1][2][3][4][5][6] Their key parametersthe energy barrier for magnetization reversal U eff and magnetization blocking temperature T b (the temperature at which the hysteresis loop closes)lately have been strongly improved and currently approach 1540 cm À1 and 80 K, respectively. [7][8][9][10] Open shell metal ions embedded in a diamagnetic ceramic inorganic matrix constitute a special class of such materials.…”

Section: Introductionmentioning

confidence: 99%

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Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation

et al. 2020

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Section: Susceptibility and Magnetizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation

et al. 2020

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“…The appearance and the slowing down of the relaxation when applying a small dc field is expected when the magnetization relaxation is dominated by quantum tunneling (quantum tunneling of magnetization, QTM) [3,77] and/or Raman processes [78]. In the QTM case, the application of a dc field minimizes the probability of the magnetization to tunnel, as already observed in many Ln(III) SMMs [18,19,23,34,57,69,79]. The temperature and frequency dependencies of the ac susceptibility were thus studied under an optimum dc field (i.e., a dc field for which the relaxation process of the magnetization exhibits a good compromise between its characteristic time and the intensity of the relaxation mode) of 600 Oe for 3•2.5MeOH and 1000 Oe for 4•3MeOH•0.5H 2 O (Figures 8 and 9).…”

Section: Ac Magnetic Susceptibilty Studiesmentioning

confidence: 92%

Asymmetric Dinuclear Lanthanide(III) Complexes from the Use of a Ligand Derived from 2-Acetylpyridine and Picolinoylhydrazide: Synthetic, Structural and Magnetic Studies

et al. 2020

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A family of four Ln(III) complexes has been synthesized with the general formula [Ln2(NO3)4(L)2(S)] (Ln = Gd, Tb, Er, and S = H2O; 1, 2 and 4, respectively/Ln = Dy, S = MeOH, complex 3), where HL is the flexible ditopic ligand N’-(1-(pyridin-2-yl)ethylidene)pyridine-2-carbohydrazide. The structures of isostructural MeOH/H2O solvates of these complexes were determined by single-crystal X-ray diffraction. The two LnIII ions are doubly bridged by the deprotonated oxygen atoms of two “head-to-head” 2.21011 (Harris notation) L¯ ligands, forming a central, nearly rhombic {LnIII2(μ-OR)2}4+ core. Two bidentate chelating nitrato groups complete a sphenocoronal 10-coordination at one metal ion, while two bidentate chelating nitrato groups and one solvent molecule (H2O or MeOH) complete a spherical capped square antiprismatic 9-coordination at the other. The structures are critically compared with those of other, previously reported metal complexes of HL or L¯. The IR spectra of 1–4 are discussed in terms of the coordination modes of the organic and inorganic ligands involved. The f-f transitions in the solid-state (diffuse reflectance) spectra of the Tb(III), Dy(III), and Er(III) complexes have been fully assigned in the UV/Vis and near-IR regions. Magnetic susceptibility studies in the 1.85–300 K range reveal the presence of weak, intramolecular GdIII∙∙∙GdIII antiferromagnetic exchange interactions in 1 [J/kB = −0.020(6) K based on the spin Hamiltonian Ĥ = −2J(ŜGd1∙ ŜGd2)] and probably weak antiferromagnetic LnIII∙∙∙LnIII exchange interactions in 2–4. Ac susceptibility measurements in zero dc field do not show frequency dependent out-of-phase signals, and this experimental fact is discussed for 3 in terms of the magnetic anisotropy axis for each DyIII center and the oblate electron density of this metal ion. Complexes 3 and 4 are Single-Molecule Magnets (SMMs) and this behavior is optimally observed under external dc fields of 600 and 1000 Oe, respectively. The magnetization relaxation pathways are discussed and a satisfactory fit of the temperature and field dependencies of the relaxation time τ was achieved considering a model that employs Raman, direct, and Orbach relaxation mechanisms.

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“…The magnetization of the molecule can also switch due to quantum tunnelling, even when the thermal energy is much less than the barrier height. Therefore, achieving high blocking temperatures requires careful design of the molecule and the ligand shell [24,25].…”

Section: Single-molecule Magnets On Surfacesmentioning

confidence: 99%

Nanostructured graphene for nanoscale electron paramagnetic resonance spectroscopy

et al. 2020

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The opening of a quantum confinement gap in nanostructured graphene yields extremely sensitive photodetectors, with electrical noise equivalent power lower than 10 −15 W Hz −0.5 at temperatures below 3 K, for detection of radiation in a very broad frequency range, including ultraviolet, visible and terahertz. Here we demonstrate the operation of these detectors in the presence of magnetic field as high as 7 T, paving the way to in situ spectroscopy of molecular nanomagnets.

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Magnetic Axiality: Design Principles from Molecules to Materials

Cited by 105 publications

References 94 publications

Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation

Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation

Asymmetric Dinuclear Lanthanide(III) Complexes from the Use of a Ligand Derived from 2-Acetylpyridine and Picolinoylhydrazide: Synthetic, Structural and Magnetic Studies

Nanostructured graphene for nanoscale electron paramagnetic resonance spectroscopy

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