scholarly journals Low-frequency complex magnetic susceptibility of magnetic composite microspheres in colloidal dispersion

2007 ◽  
Vol 311 (1) ◽  
pp. 145-149 ◽  
Author(s):  
Ben H. Erné ◽  
Maria Claesson ◽  
Stefano Sacanna ◽  
Mark Klokkenburg ◽  
Emile Bakelaar ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Low Frequency ◽  
Colloidal Dispersion ◽  
Magnetic Composite ◽  
Composite Microspheres

scholarly journals Magnetic Response of Pr1-xLaCexCuO4 in Comparison with Hole-Doped Cuprates

2014 ◽  
Vol 215 ◽  
pp. 11-16
Author(s):  
Alexei Sherman
Keyword(s):  
Magnetic Susceptibility ◽  
Superconducting State ◽  
Projection Operator ◽  
Low Frequency ◽  
Spin Excitation ◽  
Magnetic Response ◽  
Operator Technique ◽  
Electron Band ◽  
Spin Excitations ◽  
Projection Operator Technique

The magnetic susceptibility of the optimally doped Pr1-xLaCexCuO4in the superconducting state is calculated using thet-Jmodel of Cu-O planes, the Mori projection operator technique, and the dispersion of electron bands derived from photoemission experiments. The electron band folding across the antiferromagnetic Brillouin zone border, which is inherent in the crystal, leads to a commensurate low-frequency response. The same band folding causes the appearance of a supplementary spin-excitation branch, which coexists with usual spin excitations. This coexistence can explain two maxima observed in the frequency dependence of the susceptibility. The two nested spin-excitation branches lead to a comb of closely spaced peaks in momentum cuts, which presumably are not resolved in experiment, being seen as a broad commensurate peak up to 100 meV. Reasons for differences in magnetic responses of electron- and hole-doped cuprates are discussed.

Shape optimization of soft magnetic composite inserts for electromagnetic stirrer with traveling magnetic field

2020 ◽  
Vol 39 (1) ◽  
pp. 28-35
Author(s):  
Kirill Bolotin ◽  
Evgeniy Leonidovich Shvidkii ◽  
Igor Sokolov ◽  
Sergey Alekseevich Bychkov
Keyword(s):  
Liquid Metal ◽  
Three Dimensional ◽  
Low Frequency ◽  
Magnetic Composite ◽  
Shape Effect ◽  
Soft Magnetic ◽  
Electrodynamic Force ◽  
Content Type ◽  
Finite Element Software ◽  
Soft Magnetic Composite

Purpose The purpose of this paper is to search optimal shape of soft magnetic composite-based inserts used to compensate the working gap between the liquid metal and the induction stirrer in metallurgical installations. Design/methodology/approach The study was based on numerical simulation of electromagnetic processes in frequency domain. To optimize inserts shape, the Nelder–Mead method was used. The maximum of integral electrodynamic force along x-axis was chosen as the objective function. All simulations were performed in finite element software package Comsol Multiphysics. Findings Optimal inserts shape was determined, at which the value of integral electrodynamic force along x-axis increased by 20% from 692  to 792 N. Originality/value Magnetic concentrators based on soft magnetic composite materials have long been used in high-frequency systems; at the same time, their use in low-frequency systems has not been previously considered in detail. The study of the shape effect of concentrators on the effectiveness of electromagnetic field in a liquid metal in a three-dimensional formulation was carried out for the first time.

scholarly journals Low-frequency low-field magnetic susceptibility of ferritin and hemosiderin

2000 ◽  
Vol 1500 (2) ◽  
pp. 186-196 ◽  
Author(s):  
P.D. Allen ◽  
T.G. St Pierre ◽  
W. Chua-anusorn ◽  
V. Ström ◽  
K.V. Rao
Keyword(s):  
Magnetic Susceptibility ◽  
Low Frequency ◽  
Low Field

Magnetic Composite Microspheres of Cassava Starch: Preparation and Characterization

2014 ◽  
Vol 926-930 ◽  
pp. 145-149
Author(s):  
Ping Lan ◽  
Yu Xian Feng ◽  
Ri Mei He ◽  
Lei Lei Qiao ◽  
Li Hong Lan ◽  
...  
Keyword(s):  
Cassava Starch ◽  
Magnetic Composite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preparation Conditions ◽  
Composite Microspheres ◽  
Condition Effect ◽  
Initial Ph ◽  
One Step ◽  
Solution Volume

The magnetic composite microspheres of cassava starch have been prepared by magnetization of one-step oxidation, using cassava starch as natural macromolecule material. The condition effect on magnetic content was evaluated by single factor experiments, such as the mass concentration of starch, reaction temperature, reaction time, stirring speed, initial pH and ferrous solution volume. Preparation conditions were optimized by these evaluation experiments. The prepared magnetic composite microspheres were characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and other means.

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