Evolution from a single relaxation process to two-step relaxation processes of Dy2 single-molecule magnets via the modulations of the terminal solvent ligands

2021 ◽  
Vol 50 (1) ◽  
pp. 217-228
Author(s):  
Dawei Li ◽  
Man-Man Ding ◽  
Yuan Huang ◽  
David Felipe Tello Yepes ◽  
Haiyan Li ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Relaxation Processes ◽  
Single Molecule Magnets

Three Dy2 SMMs were synthesized and characterized. The target of evolution from a single relaxation process to two-step relaxation processes was achieved by adjusting the sizes of the terminal solvent ligands.

Dramatic impact of auxiliary ligands on the two-step magnetic relaxation process in Dy4(iii) single-molecule magnets

2019 ◽  
Vol 48 (17) ◽  
pp. 5793-5799 ◽  
Author(s):  
Kun Zhang ◽  
Gao-Peng Li ◽  
Cheng Zhang ◽  
Yao-Yu Wang
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Coordination Sites

Two-step relaxation processes are modulated in two Dy(iii)4 SMMs through modifying the auxiliary ligands on the changeable coordination sites.

Cu(ii)–Dy(iii) and Co(iii)–Dy(iii) based single molecule magnets with multiple slow magnetic relaxation processes in the Cu(ii)–Dy(iii) complex

2015 ◽  
Vol 44 (29) ◽  
pp. 13242-13249 ◽  
Author(s):  
Malay Dolai ◽  
Mahammad Ali ◽  
Ján Titiš ◽  
Roman Boča
Keyword(s):  
Schiff Base ◽  
Single Molecule ◽  
Schiff Base Ligand ◽  
Magnetic Relaxation ◽  
Magnetic Behaviour ◽  
Dinuclear Complexes ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Slow Magnetic Relaxation

Two CuII–DyIII and CoIII–DyIII dinuclear complexes of a Schiff base ligand (H3L) exhibit single-molecule magnetic behaviour with multiple slow magnetic relaxation processes for the former.

Magnetic field and dilution effects on the slow relaxation of {Er3} triangle-based arsenotungstate single-molecule magnets

2020 ◽  
Vol 49 (35) ◽  
pp. 12458-12465 ◽  
Author(s):  
Hanhan Chen ◽  
Lin Sun ◽  
Jinpeng Zhang ◽  
Zikang Xiao ◽  
Pengtao Ma ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Slow Relaxation ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Thermally Activated ◽  
Slow Magnetic Relaxation ◽  
Dilution Effects

Triangular {Er3} cluster containing POM exhibits field-induced two thermally activated relaxation processes. Whereas, the diamagnetic dilution sample indicates slow magnetic relaxation with the QTM being partially suppressed.

scholarly journals Relationship between the Coordination Geometry and Spin Dynamics of Dysprosium(III) Heteroleptic Triple-Decker Complexes

2019 ◽  
Vol 5 (4) ◽  
pp. 65 ◽  
Author(s):  
Tetsu Sato ◽  
Satoshi Matsuzawa ◽  
Keiichi Katoh ◽  
Brian K. Breedlove ◽  
Masahiro Yamashita
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Spin Dynamics ◽  
Twist Angle ◽  
Magnetic Interactions ◽  
Relaxation Processes ◽  
Coordination Geometry ◽  
Single Molecule Magnets ◽  
Spin Lattice ◽  
The Relationship

When using single molecule magnets (SMMs) in spintronics devices, controlling the quantum tunneling of the magnetization (QTM) and spin-lattice interactions is important. To improve the functionality of SMMs, researchers have explored the effects of changing the coordination geometry of SMMs and the magnetic interactions between them. Here, we report on the effects of the octa-coordination geometry on the magnetic relaxation processes of dinuclear dysprosium(III) complexes in the low-temperature region. Mixed ligand dinuclear Dy3+ triple-decker complexes [(TPP)Dy(Pc)Dy(TPP)] (1), which have crystallographically equivalent Dy3+ ions, and [(Pc)Dy(Pc)Dy(TPP)] (2), which have non-equivalent Dy3+ ions, (Pc2− = phthalocyaninato; TPP2− = tetraphenylporphyrinato), undergo dual magnetic relaxation processes. This is due to the differences in the ground states due to the twist angle (φ) between the ligands. The relationship between the off-diagonal terms and the dual magnetic relaxation processes that appears due to a deviation from D4h symmetry is discussed.

Multiple-decker phthalocyaninato dinuclear lanthanoid(iii) single-molecule magnets with dual-magnetic relaxation processes

2012 ◽  
Vol 41 (44) ◽  
pp. 13582 ◽  
Author(s):  
Keiichi Katoh ◽  
Yoji Horii ◽  
Nobuhiro Yasuda ◽  
Wolfgang Wernsdorfer ◽  
Koshiro Toriumi ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetic Relaxation ◽  
Relaxation Processes ◽  
Single Molecule Magnets

scholarly journals Defects, Tunneling, and EPR Spectra of Single-Molecule Magnets

2002 ◽  
Vol 746 ◽  
Author(s):  
Kyungwha Park ◽  
M. A. Novotny ◽  
N. S. Dalal ◽  
S. Hill ◽  
P. A. Rikvold ◽  
...  
Keyword(s):  
Single Molecule ◽  
Mean Field ◽  
Anisotropy Parameter ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Paramagnetic Resonance ◽  
Tunneling Mechanism ◽  
Dipole Interactions

ABSTRACTWe examine theoretically electron paramagnetic resonance (EPR) lineshapes as functions of resonance frequency, energy level, and temperature for single crystals of three different kinds of single-molecule nanomagnets (SMMs): Mn12 acetate, Fe8Br, and the S = 9/2 Mn4 compound. We use a density-matrix equation and consider distributions in the uniaxial (second-order) anisotropy parameter D and the g factor, caused by possible defects in the samples. Additionally, weak intermolecular exchange and electronic dipole interactions are included in a mean-field approximation. Our calculated linewidths are in good agreement with experiments. We find that the distribution in D is common to the three examined single-molecule magnets. This could provide a basis for a proposed tunneling mechanism due to lattice defects or imperfections. We also find that weak intermolecular exchange and dipolar interactions are mainly responsible for the temperature dependence of the lineshapes for all three SMMs, and that the intermolecular exchange interaction is more significant for Mn4 than for the other two SMMs. This finding is consistent with earlier experiments and suggests the role of spin-spin relaxation processes in the mechanism of magnetization tunneling.

scholarly journals Single-molecule magnets: Jahn–Teller isomerism and the origin of two magnetization relaxation processes in Mn12 complexes

Polyhedron ◽  
2001 ◽  
Vol 20 (11-14) ◽  
pp. 1139-1145 ◽  
Author(s):  
Sheila M.J Aubin ◽  
Ziming Sun ◽  
Hilary J Eppley ◽  
Evan M Rumberger ◽  
Ilia A Guzei ◽  
...  
Keyword(s):  
Single Molecule ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Jahn Teller

scholarly journals Series of Chloranilate-Bridged Dinuclear Lanthanide Complexes: Kramers Systems Showing Field-Induced Slow Magnetic Relaxation

2019 ◽  
Vol 5 (2) ◽  
pp. 30 ◽  
Author(s):  
Ryuta Ishikawa ◽  
Shoichi Michiwaki ◽  
Takeshi Noda ◽  
Keiichi Katoh ◽  
Masahiro Yamashita ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Lanthanide Complexes ◽  
Relaxation Processes ◽  
X Ray Diffraction ◽  
Single Molecule Magnets ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Slow Magnetic Relaxation

A series of chloralilate-bridged dinuclear lanthanide complexes of formula [{LnIII(Tp)2}2(μ-Cl2An)]·2CH2Cl2, where Cl2An2− and Tp− represent the chloranilate and hydrotris (pyrazolyl)borate ligands, respectively, and Ln = Gd (1), Tb (2), Ho (3), Er (4), and Yb (5) was synthesized. All five complexes were characterized by an elemental analysis, infrared spectroscopy, single crystal X-ray diffraction, and SQUID measurements. The complexes 1–5 in the series were all isostructural. A comparison of the temperature dependence of the dc magnetic susceptibility data of these complexes revealed clear differences depending on the lanthanide center. Ac magnetic susceptibility measurements revealed that none of the five complexes exhibited a slow magnetic relaxation under a zero applied dc field. On the other hand, the Kramers systems (complexes 4 and 5) clearly displayed a slow magnetic relaxation under applied dc fields, suggesting field-induced single-molecule magnets that occur through Orbach and Raman relaxation processes.

The origin of the second relaxation process in the [Mn12O12(O2CR)16(H2O)4] single-molecule magnets: ‘Jahn–Teller isomerism’ in the [Mn12O12] core

1999 ◽  
pp. 1973-1974 ◽  
Author(s):  
Ziming Sun ◽  
Daniel Ruiz ◽  
David N. Hendrickson ◽  
Neil R. Dilley ◽  
M. Brian Maple ◽  
...  
Keyword(s):  
Relaxation Process ◽  
Single Molecule ◽  
Single Molecule Magnets ◽  
Jahn Teller
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