Measurement of the magnetic field in the near-field region and self-inductance in free space due to a multiturn square-loop

1997 ◽  
Vol 144 (6) ◽  
pp. 252-256 ◽  
Author(s):  
E. Lou ◽  
V.J. Raso ◽  
N.G. Durdle ◽  
D.L. Hill
Keyword(s):  
Magnetic Field ◽  
Free Space ◽  
Near Field ◽  
Field Region ◽  
The Magnetic Field

scholarly journals Молекулярные состояния композитных фермионов в самоорганизованных квантовых точках InP/GaInP в нулевом внешнем магнитном поле

2020 ◽  
Vol 54 (2) ◽  
pp. 138
Author(s):  
А.М. Минтаиров
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Near Field ◽  
Optical Microscope ◽  
Zero Magnetic Field ◽  
Composite Fermions ◽  
Photoluminescence Spectra ◽  
Topological Quantum ◽  
Near Field Scanning ◽  
The Magnetic Field

Abstract The size and positions of regions of line localization and the magnetic-field (0–10 T) dependence of the low-temperature (10 K) photoluminescence spectra of single InP/GaInP quantum dots with a number of electrons of N = 5–7 and a Wigner–Seitz radius of ~2.5 are determined using a near-field scanning optical microscope. The formation of composite fermion molecules with a size coinciding with that of localization regions and bond lengths of ~30 and 50 nm, respectively, at a Landau-level filling factor from 1/2 to 2/7 in zero magnetic field is established. At N = 6, the pairing and rearrangement of composite fermions under photoexcitation are found, which offers opportunities for the use of InP/GaInP quantum dots to create a magnetic-field-free topological quantum gate.

Acoustic End Effects in Magnetohydrodynamic Submerged Vehicular Propulsors

1992 ◽  
Vol 36 (01) ◽  
pp. 69-76
Author(s):  
John S. Walker ◽  
Gita Talmage ◽  
Samuel H. Brown ◽  
Neal A. Sondergaard
Keyword(s):  
Magnetic Field ◽  
Inertial Force ◽  
Zero Field ◽  
Uniform Field ◽  
Field Region ◽  
Characteristic Ratio ◽  
Fringing Field ◽  
Field Lines ◽  
Channel Configuration ◽  
The Magnetic Field

This paper treats the effects near the ends of the channel on the transmission and reflection of periodic acoustic waves generated at some cross section inside a magnetohydrodynamic (MHD) seawater propulsion system. A region of high uniform magnetic field inside the MHD submerged vehicular propulsor is separated from the essentially zero magnetic field outside the channel by a nonuniform, fringing magnetic field at each end of the channel. The channel configuration chosen here is that of a straight, rectangular duct with electrically insulating top and bottom walls perpendicular to the magnetic field and highly conducting sidewalls parallel to the field. In particular, the mathematical analysis focuses on determining the percentage of the incident wave which is reflected by the fringing-field region back into the uniform-field region and the percentage which is transmitted through the fringing-field region into the zero-field region. The key parameter is the acoustic interaction parameter N, which is the characteristic ratio of the electromagnetic body force opposing motions across magnetic field lines to the inertial "force" in the acoustic wave. Solutions are presented for the fundamental, plane acoustic mode for arbitrary values of Ν and for all acoustic modes for Ν < 1. The amplitudes of the reflected and transmitted waves depend on the wave frequency, the length of the fringing-field region, N, and the type of wave mode. The magnetic field introduces a strong anisotropy with strong damping of modes involving transverse motions across magnetic field lines and with weak damping of modes involving transverse motions along field lines. This is the third in a series of articles on MHD marine propulsion from the David Taylor Research Center MHD propulsion program [Brown et al (1990), Tempelmeyer (1990)].

Rapid collapse of antiparallel magnetic field system of finite width by fast reconnexion

1981 ◽  
Vol 25 (2) ◽  
pp. 309-321 ◽  
Author(s):  
Masayuki Ugai
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
Magnetic Energy ◽  
Finite Width ◽  
Field Region ◽  
Field Reversal ◽  
Return Current ◽  
Magnetic Field Region ◽  
Current Flows ◽  
The Magnetic Field

The present computer experiment studies an explosive magnetic energy conversion in an antiparallel-fleid system of finite width where sheet current flows in the middle of the system and return current flows on both sides of the system. It is demonstrated that, initiated by local onset of anomalous resistivity, the global plasma flow grows so as to bring about the so-called fast reconnexion process that provides rapid magnetic flux transfer as well as rapid magnetic energy release. In the resulting configuration of fast reconnexion, the plasma flow drastically reverses its direction across the magnetic- field region, and the effective width of the magnetic-field region becomes rapidly reduced with time. It is found that the fast reconnexion suddenly decays when the front tip of the return-current region has just arrived at the field-reversal region.

scholarly journals Near-field probing the magnetic field vector of visible light with a silicon nanoparticle probe and nanopolarimetry

2018 ◽  
Vol 26 (19) ◽  
pp. 24637 ◽  
Author(s):  
Lin Sun ◽  
Benfeng Bai ◽  
Xiaoxia Meng ◽  
Tong Cui ◽  
Guangyi Shang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Visible Light ◽  
Near Field ◽  
Field Vector ◽  
Magnetic Field Vector ◽  
Silicon Nanoparticle ◽  
The Magnetic Field

scholarly journals Analysis of the Influence of the Neighbouring Elements in an HGMS Matrix on the Magnetic Field Distribution in the Vicinity of One Element

2004 ◽  
Vol 13 (2) ◽  
pp. 69-78
Author(s):  
Yu. S. Mostyka ◽  
V. Yu. Shutov ◽  
L. Z. Grebenyuk
Keyword(s):  
Magnetic Field ◽  
Field Distribution ◽  
Free Space ◽  
Magnetic Field Distribution ◽  
Force Distribution ◽  
Distribution Characteristic ◽  
Field Point ◽  
Relative Differences ◽  
Matrix Free ◽  
The Magnetic Field

This article theoretically researches the magnetic field distribution within HGMS matrix free space – a stack of orderly placed cylinder bars. It is shown that, in near vicinity of any matrix bar, the distribution of the magnetic field practically coincides with the field distribution around a single cylinder. Relative differences of force distribution characteristic f(x,y)=H|gradH| are calculated for the bar stack and single cylinders depending upon the relative distance between a given field point and the axis of the bar.

MAGNETO-OPTICS OF QUANTUM DOTS IN THE NEAR FIELD

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1649-1653
Author(s):  
CONSTANTINOS SIMSERIDES ◽  
ANNA ZORA ◽  
GEORGIOS TRIBERIS
Keyword(s):  
Magnetic Field ◽  
Spatial Resolution ◽  
Near Field ◽  
Resolving Power ◽  
Zero Magnetic Field ◽  
Far Field ◽  
Field Orientation ◽  
Structural Symmetry ◽  
Near Field Optics ◽  
The Magnetic Field

We examine a quantum dot (QD) illuminated in the near field with subwavelength spatial resolution, while simultaneously it is subjected to a magnetic field of variable orientation and magnitude. The magnetic field orientation can conserve or destroy the zero-magnetic-field ("structural") symmetry. The asymmetry induced by the magnetic field -except for specific orientations along symmetry axes- can be uncovered in the near-field (NF) but not in the far-field (FF) spectra. We predict that NF magnetoabsorption experiments of realistic spatial resolution could reveal the QD symmetry. This exceptional symmetry-resolving power of the near-field optics, is lost in the far field.

MAGNETIC DEPENDENCE OF HALL SIGN REVERSAL FOR Gd1-xPrxBa2Cu3O7-δ IN A VORTEX STATE

2002 ◽  
Vol 16 (22) ◽  
pp. 853-860 ◽  
Author(s):  
V. DAADMEHR ◽  
H. NAGHSHARA ◽  
M. AKHAVAN
Keyword(s):  
Magnetic Field ◽  
High Temperature Superconductors ◽  
Vortex State ◽  
Complex Nature ◽  
Field Region ◽  
Sign Reversal ◽  
Hall Resistivity ◽  
Sign Change ◽  
Magnetic Field Region ◽  
The Magnetic Field

We have investigated the sign reversal of Hall effect in high-temperature superconductors in the vortex state as a function of temperature for several samples of Gd 1-x Pr x Ba 2 Cu 3 O 7-δ with 0.2 ≥ x ≥ 0 in a magnetic field of 0–2 T. Multiple sign reversals of Hall resistivity have been observed in under-doped and partially over-doped samples. The Gd 1-x Pr x Ba 2 Cu 3 O 7-δ sample with x = 0.1 shows double sign change in Hall resistivity with variation of magnetic field, and a single sign reversal with variation of temperature. While for the x = 0.15 and x = 0.2 samples, no sign reversal is observed, for the x < 0.1 sample, one sign change of Hall resistivity with temperature over the magnetic field region is observed. The tan (θ H ) also shows a similar double sign reversal of Hall resistivity. This can be related to the particle-hole asymmetry and the complex nature of the Fermi surface.

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