Field influence on the slow magnetic relaxation of nickel-based single ion magnets

2018 ◽  
Vol 47 (24) ◽  
pp. 7879-7882 ◽  
Author(s):  
Ján Titiš ◽  
Cyril Rajnák ◽  
Dušan Valigura ◽  
Roman Boča
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
External Field ◽  
Applied Magnetic Field ◽  
Magnetic Relaxation ◽  
Low Frequency ◽  
Mononuclear Complex ◽  
Frequency Channel ◽  
Slow Magnetic Relaxation ◽  
Field Influence

A mononuclear complex, [Ni(pydca)(dmpy)]·H2O, exhibits a slow magnetic relaxation under an applied magnetic field with manifold relaxation channels. With an external field of 0.6 T, the low-frequency channel is the dominating relaxation path yielding a relaxation time of 322 ms at 2.0 K. At 1.2 T the relaxation time is as slow as 876 ms.

Slow magnetic relaxation in a μ1,1′-azido cobalt(ii) methylquinoline chain complex

2018 ◽  
Vol 47 (44) ◽  
pp. 15745-15750 ◽  
Author(s):  
Cyril Rajnák ◽  
Ľubor Dlháň ◽  
Ján Moncol ◽  
Ján Titiš ◽  
Roman Boča
Keyword(s):  
Relaxation Time ◽  
External Field ◽  
Magnetic Relaxation ◽  
Low Frequency ◽  
Chain Complex ◽  
Frequency Mode ◽  
Chain Architecture ◽  
1D Chain ◽  
Slow Magnetic Relaxation ◽  
Low Frequency Mode

A [Co(N3)2(mqu)] complex with a 1D chain architecture (mqu – 4-methylquinoline) shows slow magnetic relaxation with three distinct modes. The relaxation time strongly depends upon the applied external field. The low-frequency mode exhibits a relaxation time longer than one second: τLF = 1.6(2) s at BDC = 0.8 T and T = 1.9 K.

Field effects to slow magnetic relaxation in a mononuclear Ni(ii) complex

2017 ◽  
Vol 53 (51) ◽  
pp. 6930-6932 ◽  
Author(s):  
D. Lomjanský ◽  
J. Moncol' ◽  
C. Rajnák ◽  
J. Titiš ◽  
R. Boča
Keyword(s):  
Relaxation Time ◽  
Magnetic Relaxation ◽  
Low Frequency ◽  
Frequency Mode ◽  
Field Effects ◽  
Slow Magnetic Relaxation ◽  
Low Frequency Mode

A mononuclear Ni(ii) complex [Ni(NCS)2(nqu)2(H2O)2]·2nqu (nqu – 5-nitroquinoline) shows a field induced slow magnetic relaxation with three relaxation domains. The relaxation time for the low-frequency mode is as slow as τ = 0.3 s at T = 1.9 K and BDC = 0.4 T.

THE GIANT VOLUMETRIC MAGNETOSTRICTION OF FERROMAGNETIC COMPOSITES WITH ELASTOMER MATRIX

1999 ◽  
Vol 13 (24) ◽  
pp. 865-878 ◽  
Author(s):  
S. BEDNAREK
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Applied Magnetic Field ◽  
Filling Factor ◽  
Sample Volume ◽  
Silicon Steel

The results of investigation of volumetric magnetostriction of a ferromagnetic composite consisting of silicon steel particles dispersed in an elastomer matrix and its relaxation are presented. The composite consisted of silicon steel particles of 0.15–0.20 mm in size, which were dispersed in a polymerized silicone. The filling factor of the composite by these particles amounted to 0.4, 0.6 or 0.8. The investigation was carried out by means of the pycnometric method in a magnetic field with the induction of 0–8 T produced by Bitter's magnet. It was found that according to the filling factor and the induction of the applied magnetic field, relative changes in the sample volume amounted to (0.37–112.8) × 10-4 and the relaxation time of the volumetric magnetostriction was 2.12–85.8 s.

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.

The Temperature of Berezinsky – Kosterlitz – Thouless Transition in Two-Dimensional Superconductor in an External Field

2014 ◽  
Vol 9 (3) ◽  
pp. 75-80
Author(s):  
Aleksandr Krinitsyn ◽  
Iliya Tikhomirov ◽  
Klimentiy Yugay
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
External Magnetic Field ◽  
External Field ◽  
Critical Field ◽  
Applied Magnetic Field ◽  
Coherence Length ◽  
Upper Critical Field ◽  
Two Dimensional ◽  
Calculated Temperature

The Method of Monte-Carlo calculated temperature of Berezinsky – Kosterlitz – Thouless transition in twodimensional superconductor 2nd type in the presence of an external magnetic field. It is shown that near the upper critical field filling cells with a size of ξ × ξ relation, where ξ – coherence length at a given temperature, corresponds to half. It is also shown that ТBKT decreases with increasing interaction between the vortices and antivortices and increase of the external applied magnetic field

Slow magnetic relaxation in Cu(ii)–Eu(iii) and Cu(ii)–La(iii) complexes

2019 ◽  
Vol 43 (32) ◽  
pp. 12698-12701 ◽  
Author(s):  
Malay Dolai ◽  
Mahammad Ali ◽  
Cyril Rajnák ◽  
Ján Titiš ◽  
Roman Boča
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Low Temperature ◽  
Ground State ◽  
Magnetic Relaxation ◽  
Slow Magnetic Relaxation ◽  
Paramagnetic Behaviour

A dinuclear [(H2O)Cu(HLN2O2)Eu(NO3)3] complex exhibits paramagnetic behaviour with S = 1/2 ground state. At low temperature it displays slow magnetic relaxation that is supported by a small external magnetic field.

scholarly journals A Mixed Valence CoIICoIII2 Field-Supported Single Molecule Magnet: Solvent-Dependent Structural Variation

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1060
Author(s):  
Susanta Hazra ◽  
Cyril Rajnák ◽  
Ján Titiš ◽  
M. Fátima C. Guedes da Silva ◽  
Roman Boča ◽  
...  
Keyword(s):  
Single Molecule ◽  
Structural Variation ◽  
Mixed Valence ◽  
Low Frequency ◽  
Structural Features ◽  
Ac Magnetic Susceptibility ◽  
Frequency Channel ◽  
One Pot ◽  
Single Molecule Magnet ◽  
Slow Magnetic Relaxation

One-pot reaction of the Schiff base N,N’-ethylene bis(salicylaldimine) (H2L), CoCl2.6H2O, and [Ph2SnCl2] in acetone produces the mixed valence CoIICoIII2 compound [CoIICoIII2(μ-L)2(Ph)2(μ-Cl)2]·(CH3)2CO·H2O (1). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic SnIVCoIII (2) or monometallic CoIII complex (3), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic CoIICoIII2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as τ~0.6 s at T = 2.0 K and BDC = 1.0 T.

Positive zero-field splitting and unexpected slow magnetic relaxation in the magneto-chemical calibrant HgCo(NCS)4

2021 ◽  
Vol 50 (10) ◽  
pp. 3468-3472
Author(s):  
Roman Boča ◽  
Ján Titiš ◽  
Cyril Rajnák ◽  
J. Krzystek
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Relaxation ◽  
Positive Zero ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Field Splitting ◽  
Zero Field Splitting Parameter ◽  
Slow Magnetic Relaxation ◽  
Splitting Parameter

Magnetochemical standard HgCo(NCS)4 with positive zero-field splitting parameter D displays a slow magnetic relaxation strongly dependent upon the external magnetic field.

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