Wave-Vector Filtering Effect in a Novel Magnetic Nanostructure with Zero Average Magnetic Field

2019 ◽  
Vol 32 (3) ◽  
pp. 451-455 ◽  
Author(s):  
Gui-Lian Zhang ◽  
Fang-Fang Peng ◽  
Jing-Song Meng
Keyword(s):  
Magnetic Field ◽  
Wave Vector ◽  
Average Magnetic Field ◽  
Magnetic Nanostructure ◽  
Filtering Effect

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

Wave vector filtering effect for electrons in magnetically and electrically confined semiconductor heterostructure

2020 ◽  
Vol 34 (06) ◽  
pp. 2050080
Author(s):  
Meng-Rou Huang ◽  
Mao-Wang Lu ◽  
Xin-Hong Huang ◽  
Dong-Hui Liang ◽  
Zeng-Lin Cao
Keyword(s):  
Wave Vector ◽  
Applied Voltage ◽  
Transmission Probability ◽  
Two Dimensional ◽  
Electron Transmission ◽  
Magnetic Nanostructure ◽  
Semiconductor Heterostructure ◽  
Filtering Efficiency ◽  
Parallel Configuration ◽  
Filtering Effect

Wave vector filtering effect is explored for electrons in magnetically and electrically confined semiconductor heterostructure, which can be realized experimentally by depositing a ferromagnetic stripe and a Schottky metal stripe in parallel configuration on the surface of [Formula: see text] heterostructure. Adopting improved transfer matrix method to solve Schrödinger equation, electronic transmission coefficient is calculated exactly, and then wave vector filtering efficiency is obtained by differentiating transmission probability over longitudinal wave vector. An obvious wave vector filtering effect appears, due to an essentially two-dimensional process for electron transmission through a magnetic nanostructure. Besides, wave vector filtering efficiency is associated closely with width, position and externally applied voltage of Schottky metal stripe, which makes wave vector filtering effect become controllable and results in a manipulable momentum filter for nanoelectronics.

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.

Weakly relativistic dielectric tensor and dispersion functions of a Maxwellian plasma

1983 ◽  
Vol 30 (1) ◽  
pp. 125-131 ◽  
Author(s):  
V. Krivenski ◽  
A. Orefice
Keyword(s):  
Magnetic Field ◽  
Wave Vector ◽  
Magnetized Plasma ◽  
Harmonic Number ◽  
Dielectric Tensor ◽  
Absorption And Emission ◽  
Emission Properties ◽  
Maxwellian Plasma ◽  
Plasma Dispersion ◽  
The Magnetic Field

In order to study the absorption and emission properties of a magnetized plasma in the electron cyclotron range of frequencies, the weakly relativistic (Shkarofsky) plasma dispersion functions are simply and exactly expressed in terms of the Z function. This gives a useful working form to the dielectric tensor, for any wave vector and harmonic number, covering also the case of electron Maxwellian distributions drifting along the magnetic field.

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.

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