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.

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.

Observations of a low-frequency mode in a linear multiple mirror

1985 ◽  
Vol 28 (7) ◽  
pp. 2302
Author(s):  
M. A. Makowski ◽  
G. A. Emmert
Keyword(s):  
Low Frequency ◽  
Frequency Mode ◽  
Low Frequency Mode

Light Scattering from Pulsed Laser Deposited BaBi4Ti4O15 Thin Films

2000 ◽  
Vol 623 ◽  
Author(s):  
R.K. Soni ◽  
Anju Dixit ◽  
R. S. Katiyar ◽  
A. Pignolet ◽  
K.M. Satyalakshmi ◽  
...  
Keyword(s):  
Thin Films ◽  
Light Scattering ◽  
Room Temperature ◽  
Layer Structure ◽  
Low Frequency ◽  
Pulsed Laser ◽  
Buffer Layers ◽  
Frequency Mode ◽  
High Frequency Vibrations ◽  
Low Frequency Mode

AbstractLight scattering investigations are carried out on BaBi4Ti4O15 (BBiT) which is a member of the Bi-layer structure ferroelectric oxide with n = 4. The BBiT thin films, thickness ∼ 300 nm, were grown on epitaxial conducting LaNiO3 electrodes on epitaxial buffer layers on (100) silicon by pulsed laser deposition. Micro-Raman measurements performed on these films reveal a sharp low-frequency mode at 51 cm−1 along with broad highfrequeficy modes corresponding to other lattice vibrations including TiO6 octahedra. No temperature dependence of the low frequency mode is seen while a weak dependence of the broad high frequency vibrations are observed in the mixed oriented regions. Raman polarization carried out at room temperature indicates that the prominent modes have Alg and Eg symmetries in the BaBi4Ti4O15 thin films.

Interactions between second mode and low-frequency waves in a hypersonic boundary layer

2017 ◽  
Vol 820 ◽  
pp. 693-735 ◽  
Author(s):  
Xi Chen ◽  
Yiding Zhu ◽  
Cunbiao Lee
Keyword(s):  
Boundary Layer ◽  
Parametric Resonance ◽  
Low Frequency ◽  
Frequency Mode ◽  
Linear Stability Theory ◽  
Hypersonic Boundary Layer ◽  
Reynolds Stresses ◽  
Second Mode ◽  
Low Frequency Mode ◽  
Low Frequency Waves

The stability of a hypersonic boundary layer on a flared cone was analysed for the same flow conditions as in earlier experiments (Zhang et al., Acta Mech. Sinica, vol. 29, 2013, pp. 48–53; Zhu et al., AIAA J., vol. 54, 2016, pp. 3039–3049). Three instabilities in the flared region, i.e. the first mode, the second mode and the Görtler mode, were identified using linear stability theory (LST). The nonlinear-parabolized stability equations (NPSE) were used in an extensive parametric study of the interactions between the second mode and the single low-frequency mode (the Görtler mode or the first mode). The analysis shows that waves with frequencies below 30 kHz are heavily amplified. These low-frequency disturbances evolve linearly at first and then abruptly transition to parametric resonance. The parametric resonance, which is well described by Floquet theory, can be either a combination resonance (for non-zero frequencies) or a fundamental resonance (for steady waves) of the secondary instability. Moreover, the resonance depends only on the saturated state of the second mode and is insensitive to the initial low-frequency mode profiles and the streamwise curvature, so this resonance is probably observable in boundary layers over straight cones. Analysis of the kinetic energy transfer further shows that the rapid growth of the low-frequency mode is due to the action of the Reynolds stresses. The same mechanism also describes the interactions between a second-mode wave and a pair of low-frequency waves. The only difference is that the fundamental and combination resonances can coexist. Qualitative agreement with the experimental results is achieved.

Observations of low-frequency mode in a multicomponent plasma with negative ions

1999 ◽  
Vol 6 (5) ◽  
pp. 1636-1640 ◽  
Author(s):  
B. Handique ◽  
H. Bailung ◽  
G. C. Das ◽  
Joyanti Chutia
Keyword(s):  
Low Frequency ◽  
Negative Ions ◽  
Frequency Mode ◽  
Multicomponent Plasma ◽  
Low Frequency Mode
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