Spin spatial splitter based on a magnetic nanostructure with zero average magnetic field

2014 ◽  
Vol 313 ◽  
pp. 545-548 ◽  
Author(s):  
Xu-Hui Liu ◽  
Gui-Lian Zhang ◽  
Yong-Hong Kong ◽  
Ai-Hua Li ◽  
Xi Fu
Keyword(s):  
Magnetic Field ◽  
Average Magnetic Field ◽  
Magnetic Nanostructure

Electron-spin filter based on a novel magnetic nanostructure with zero average magnetic field

2016 ◽  
Vol 54 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Gui-Xiang Liu ◽  
Li-Hua Shen ◽  
Wen-Yue Ma ◽  
Lin Yuan
Keyword(s):  
Magnetic Field ◽  
Electron Spin ◽  
Spin Filter ◽  
Average Magnetic Field ◽  
Magnetic Nanostructure

A 4 × 4 array multichannel magnetic stimulation system using submillimeter sized planar square spiral coils: The spatial distribution of electromagnetic field

2022 ◽  
pp. 1-18
Author(s):  
Lei Tian ◽  
Limei Song ◽  
Yu Zheng ◽  
Jinhai Wang
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Spatial Distribution ◽  
Field Strength ◽  
Electric Field ◽  
Magnetic Stimulation ◽  
Spiral Coil ◽  
Average Magnetic Field ◽  
Stimulation System ◽  
Field Strengths

Multi-coil magnetic stimulation has advantages over single-coil magnetic stimulation, such as more accurate targeting and larger stimulation range. In this paper, a 4 × 4 array multichannel magnetic stimulation system based on a submillimeter planar square spiral coil is proposed. The effects of multiple currents with different directions on the electromagnetic field strength and the focusing zone of the array-structured magnetic stimulation system are studied. The spatial distribution characteristics of the electromagnetic field are discussed. In addition, a method is proposed that can predict the spatial distributions of the electric and magnetic fields when currents in different directions are applied to the array-structured magnetic stimulation system. The study results show that in the section of z = 2 μm, the maximum and average magnetic field strengths of the array-structured magnetic stimulation system are 6.39 mT and 2.68 mT, respectively. The maximum and average electric field strengths are 614.7 mV/m and 122.82 mV/m, respectively, where 84.39% of the measured electric field values are greater than 73 mV/m. The average magnetic field strength of the focusing zone, i.e., the zone in between the two coils, is 3.38 mT with a mean square deviation of 0.18. Therefore, the array-structured multi-channel magnetic stimulation system based on a planar square spiral coil can have a small size of 412 μm × 412 μm × 1.7 μm, which helps improving the spatial distribution of electromagnetic field and increase the effectiveness of magnetic stimulation. The main contribution of this paper is a method for designing multichannel micro-magnetic stimulation devices.

scholarly journals Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Davor Vinko ◽  
Domagoj Bilandžija ◽  
Vanja Mandrić Radivojević
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Field Distribution ◽  
Uniform Magnetic Field ◽  
Optimization Method ◽  
Magnetic Field Distribution ◽  
Wireless Power ◽  
Average Magnetic Field ◽  
Coil Structure

Conventional magnetically coupled resonant wireless power transfer systems are faced with resonant frequency splitting phenomena and impedance mismatch when a receiving coil is placed at misaligned position. These problems can be avoided by using uniform magnetic field distribution at receiving plane. In this paper, a novel 3D transmitting coil structure with improved uniform magnetic field distribution is proposed based on a developed optimization method. The goal is to maximize the average magnetic field strength and uniform magnetic field section of the receiving plane. Hence, figures of merit (FoM1 and FoM2) are introduced and defined as product of average magnetic field strength and length or surface along which uniform magnetic field is generated, respectively. The validity of the optimization method is verified through laboratory measurements performed on the fabricated coils driven by signal generator at operating frequency of 150 kHz. Depending on the allowed ripple value and predefined coil proportions, the proposed transmitting coil structure gives the uniform magnetic field distribution across 50% to 90% of the receiving plane.

scholarly journals The average magnetic field draping and consistent plasma properties of the Venus magnetotail

1986 ◽  
Vol 91 (A7) ◽  
pp. 7939 ◽  
Author(s):  
D. J. McComas ◽  
H. E. Spence ◽  
C. T. Russell ◽  
M. A. Saunders
Keyword(s):  
Magnetic Field ◽  
Plasma Properties ◽  
Average Magnetic Field
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