High Permeability of Z-Type Ferrite Sheets Directional Array

2017 ◽  
Vol 898 ◽  
pp. 1645-1648
Author(s):  
Shi Bing Pan ◽  
Cheng Jun Zhang ◽  
Hai Kun Wu ◽  
Lei Qian ◽  
Ming Xun Yu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Permeability ◽  
Chemical Precipitation ◽  
Media Theory ◽  
Precipitation Method ◽  
Intrinsic Permeability ◽  
High Permeability ◽  
Effective Media ◽  
Specific Direction ◽  
Effective Media Theory

Z-type ferrite sheets were prepared by chemical precipitation method to investigate influences of directional arrays from the Z-type ferrite sheets on magnetic properties. The permeability of the ferrite directional arrays was obviously improved in the specific direction. Assuming that the intrinsic permeability of Z-type ferrite was existed, the magnetic permeability in array was calculated by the Maxwell-Garnett equation of effective media theory. The reason for the large difference between the theoretical calculation and measured value was also discussed.

scholarly journals Impact of Iron on the Fe–Co–Ni Ternary Nanocomposites Structural and Magnetic Features Obtained via Chemical Precipitation Followed by Reduction Process for Various Magnetically Coupled Devices Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 341
Author(s):  
Tien Hiep Nguyen ◽  
Gopalu Karunakaran ◽  
Yu.V. Konyukhov ◽  
Nguyen Van Minh ◽  
D.Yu. Karpenkov ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Reduction Process ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Magnetic Characteristics ◽  
Reduction Temperature ◽  
Fe Content ◽  
Magnetic Features ◽  
Co Precipitation

This paper presents the synthesis of Fe–Co–Ni nanocomposites by chemical precipitation, followed by a reduction process. It was found that the influence of the chemical composition and reduction temperature greatly alters the phase formation, its structures, particle size distribution, and magnetic properties of Fe–Co–Ni nanocomposites. The initial hydroxides of Fe–Co–Ni combinations were prepared by the co-precipitation method from nitrate precursors and precipitated using alkali. The reduction process was carried out by hydrogen in the temperature range of 300–500 °C under isothermal conditions. The nanocomposites had metallic and intermetallic phases with different lattice parameter values due to the increase in Fe content. In this paper, we showed that the values of the magnetic parameters of nanocomposites can be controlled in the ranges of MS = 7.6–192.5 Am2/kg, Mr = 0.4–39.7 Am2/kg, Mr/Ms = 0.02–0.32, and HcM = 4.72–60.68 kA/m by regulating the composition and reduction temperature of the Fe–Co–Ni composites. Due to the reduction process, drastic variations in the magnetic features result from the intermetallic and metallic face formation. The variation in magnetic characteristics is guided by the reduction degree, particle size growth, and crystallinity enhancement. Moreover, the reduction of the surface spins fraction of the nanocomposites under their growth induced an increase in the saturation magnetization. This is the first report where the influence of Fe content on the Fe–Co–Ni ternary system phase content and magnetic properties was evaluated. The Fe–Co–Ni ternary nanocomposites obtained by co-precipitation, followed by the hydrogen reduction led to the formation of better magnetic materials for various magnetically coupled device applications.

scholarly journals Effective media theory with spatial correlation for flow in a fracture

1997 ◽  
Vol 102 (B10) ◽  
pp. 22587-22594 ◽  
Author(s):  
Joseph B. Walsh ◽  
Stephen R. Brown ◽  
William B. Durham
Keyword(s):  
Spatial Correlation ◽  
Media Theory ◽  
Effective Media ◽  
Effective Media Theory

Permeability calculation in composite media with low filler concentration: A new method of effective media theory application

2009 ◽  
Vol 105 (7) ◽  
pp. 07A526 ◽  
Author(s):  
J. T. Jiang ◽  
L. Zhen ◽  
X. J. Wei ◽  
Y. X. Gong ◽  
W. Z. Shao ◽  
...  
Keyword(s):  
Media Theory ◽  
New Method ◽  
Filler Concentration ◽  
Composite Media ◽  
Effective Media ◽  
Effective Media Theory ◽  
Theory Application

Preparation and Characterization of Water Based and Double Enveloped Nano-Fe3O4 Magnetic Fluids

2010 ◽  
Vol 152-153 ◽  
pp. 1044-1048
Author(s):  
Lai Qiang Li ◽  
Shu Lin Wang ◽  
Jie Liu ◽  
Sheng Juan Li ◽  
Jun Jing Zhang
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Magnetic Fluid ◽  
Crystallization Behavior ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Water Based ◽  
Water Base

The nanoparticles of Fe3O4 were prepared with chemical precipitation method, and then used sodium oleate and the lauryl sulfonic aid sodium as bilayer to envelope the ultra-fine Fe3O4 particles. Then stabilized water base magnetic fluid was obtained. The crystallization behavior and the surface of Fe3O4 nanoparticles after the modification were investigated with XRD and IR respectively; the particle size was studied with TEM; the magnetic properties were studied with VSM. The mechanism of bilayer surfactants that modified Fe3O4 magnetic nanoparticles was explained, and influencing factors of the magnetic fluid were discussed.

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