scholarly journals Field-dependent prefactor of the thermal relaxation rate in single-domain magnetic particles

1993 ◽  
Vol 48 (21) ◽  
pp. 15823-15828 ◽  
Author(s):  
Ivo Klik ◽  
Ching-Ray Chang ◽  
Huei Li Huang
Keyword(s):  
Relaxation Rate ◽  
Magnetic Particles ◽  
Thermal Relaxation ◽  
Single Domain ◽  
Field Dependent

scholarly journals Integrated Magnetic Analyses for the Discrimination of Urban and Industrial Dusts

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1056
Author(s):  
Beata Górka-Kostrubiec ◽  
Tadeusz Magiera ◽  
Katarzyna Dudzisz ◽  
Sylwia Dytłow ◽  
Małgorzata Wawer ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Particles ◽  
Steel Production ◽  
Hysteresis Loops ◽  
Street Dust ◽  
Single Domain ◽  
Magnetic Fraction ◽  
Magnetic Methods ◽  
Urban Dusts ◽  
Traffic Related Pollution

Industrial and urban dusts were characterized by investigating their magnetic properties. Topsoil composed of technogenic magnetic particles (TMP) originating from areas affected by three ironworks, street dust mainly composed of traffic-related pollution, and particulate matter (PM) from urban agglomeration in Warsaw, Poland were investigated. Several magnetic methods, namely magnetic susceptibility, thermomagnetic curves, hysteresis loops, decomposition of isothermal remanent magnetization acquisition curves, and first-order reversal curves, were performed to evaluate the magnetic fraction of dust. Magnetite was the main magnetic phase in all types of samples, with a small amount of high-coercive hematite within ironworks and street dust samples. Significant differences were observed in the domain structure (grain size) of industrial and traffic-related magnetic particles. The grain size of TMP obtained from steel production was in the range of 5–20 µm and was predominated by a mixture of single-domain (SD) and multidomain (MD) grains, with the prevalence of SD grains in the topsoil affected by Třinec ironwork. The traffic-related dust contained finer grains with a size of about 0.1 µm, which is characteristic of the pseudo-single-domain (PSD)/SD threshold. Street dusts were composed of a slightly higher proportion of MD grains, while PM also revealed the typical behavior of superparamagnetic particles.

Effect of Magnet Moving Speed on the Relaxation Rate of the Levitation Force for YBCO Bulk

2007 ◽  
Vol 546-549 ◽  
pp. 2103-2106 ◽  
Author(s):  
X.L. Wu ◽  
W.M. Yang ◽  
S.H. Zhu ◽  
J.Z. Guo ◽  
T.N. Lu ◽  
...  
Keyword(s):  
Relaxation Rate ◽  
Permanent Magnet ◽  
Measurement System ◽  
Levitation Force ◽  
Force Measurement ◽  
Single Domain ◽  
Ybco Bulk ◽  
Optimal Speed ◽  
Force Measurement System ◽  
Moving Speed

The effect of magnet moving speed on the relaxation of the maximum levitation force of YBCO bulk has been investigated. The experiment was carried out between a cylinder permanent magnet and a single-domain YBCO bulk, and the levitation force was measured using a self-made levitation force measurement system. It is found that the levitation force decreases with time after the gap distance between the magnet and YBCO bulk reduced to 2 mm and kept for the test. It is also found that the levitation force and its relaxation rate is different for different moving speed between the magnet and the YBCO bulk, and the higher the moving speed, the greater the relaxation rate of levitation force. However, the largest levitation force is obtained at an optimal speed, the higher the levitation force, and the faster the relaxation of levitation force.

General Properties of Thermal-Relaxation Rate Equations

1973 ◽  
Vol 8 (7) ◽  
pp. 3487-3487
Author(s):  
M. W. P. Strandberg ◽  
J. R. Shane
Keyword(s):  
Relaxation Rate ◽  
Thermal Relaxation ◽  
Rate Equations ◽  
General Properties

Noncollinear states in a chain of single-domain magnetic particles

JETP Letters ◽  
2011 ◽  
Vol 93 (12) ◽  
pp. 716-719 ◽  
Author(s):  
K. P. Mukhamatchin ◽  
A. A. Fraerman
Keyword(s):  
Magnetic Particles ◽  
Single Domain ◽  
A Chain
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