The Magnetic Field at Tungsten Nuclei in Iron

1972 ◽  
Vol 50 (8) ◽  
pp. 736-739 ◽  
Author(s):  
J. A. Cameron ◽  
L. Keszthelyi ◽  
G. Mezei ◽  
Z. Szökefalvi-Nagy ◽  
L. Varga
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Hyperfine Field ◽  
Iron Alloy ◽  
Larmor Precession ◽  
Hyperfine Anomaly ◽  
The Magnetic Field ◽  
Mev Protons ◽  
G Factors

Larmor precession of the first 2+ states of 182W and 184W has been observed in an iron alloy containing 5 atom % W. The levels were Coulomb excited with 2.5 MeV protons. The hyperfine energy in 182W is the same as that found by Mössbauer absorption. The variation of the field up to 300 °K is less than 6%. A comparison of g factors measured by the hyperfine field and the external field suggests the existence of a hyperfine anomaly.

scholarly journals Interpolation of externally-caused magnetic fields over large sparse arrays using Spherical Elementary Current Systems

2010 ◽  
Vol 28 (9) ◽  
pp. 1795-1805 ◽  
Author(s):  
S. A. McLay ◽  
C. D. Beggan
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Current System ◽  
Electrical Current ◽  
Ionospheric Currents ◽  
Large Area ◽  
Physically Based ◽  
Subsurface Current ◽  
Current Systems ◽  
The Magnetic Field

Abstract. A physically-based technique for interpolating external magnetic field disturbances across large spatial areas can be achieved with the Spherical Elementary Current System (SECS) method using data from ground-based magnetic observatories. The SECS method represents complex electrical current systems as a simple set of equivalent currents placed at a specific height in the ionosphere. The magnetic field recorded at observatories can be used to invert for the electrical currents, which can subsequently be employed to interpolate or extrapolate the magnetic field across a large area. We show that, in addition to the ionospheric currents, inverting for induced subsurface current systems can result in strong improvements to the estimate of the interpolated magnetic field. We investigate the application of the SECS method at mid- to high geomagnetic latitudes using a series of observatory networks to test the performance of the external field interpolation over large distances. We demonstrate that relatively few observatories are required to produce an estimate that is better than either assuming no external field change or interpolation using latitudinal weighting of data from two other observatories.

Nuclear g factors of three levels of 192Pt

1969 ◽  
Vol 47 (21) ◽  
pp. 2395-2399 ◽  
Author(s):  
D. B. Kenyon ◽  
L. Keszthelyi ◽  
J. A. Cameron
Keyword(s):  
Hyperfine Field ◽  
Angular Correlation ◽  
Iron Alloy ◽  
Scintillation Detectors ◽  
Angular Correlations ◽  
Mixing Ratios ◽  
G Factors

The g factors of the 316, 612, and 785 keV levels of 192Pt have been measured using gamma–gamma angular correlations perturbed by the hyperfine field in an iron alloy. Sources were 192Ir in 1 at.% Ir Fe alloy. Coincidences were observed using a combination of Ge(Li) and scintillation detectors. For the three levels, the g factors obtained were[Formula: see text]In addition, the E2/M1 mixing ratios were obtained from the angular correlation measurements.[Formula: see text]

Infinite solitons in ferromagnetic materials with an internal magnetic field

2021 ◽  
pp. 2150413
Author(s):  
Hamdy I. Abdel-Gawad
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
External Field ◽  
Model Equation ◽  
Graphical Representation ◽  
Magnetic Moments ◽  
Soliton Solutions ◽  
Internal Magnetic Field ◽  
Multiple Soliton Solutions ◽  
The Magnetic Field

The ferromagnetism induced by an external magnetic field (EMF), in (3+1) dimensions, is governed by Kraenkel–Manna–Merle system (KMMS). A (1+1) dimension model equation was derived in the literature. The magnetic moments are parallel to the magnetic field in ferromagnetism as they are aligning in the same direction of the external field. Here, it is shown that the KMMS supports the presence of internal magnetic field. This may be argued to medium characteristics. The objective of this work is to mind multiple soliton solutions, which are obtained via the generalized together with extended unified methods. Graphical representation of the results are carried. They describe infinite soliton shapes, which arise from the multiple variation of the arbitrary functions in the solutions. It is, also, shown that internal magnetic field decays, asymptotically, to zero with time.

scholarly journals External Field-Controlled Ablation: Magnetic Field

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1662 ◽  
Author(s):  
Jovan Maksimovic ◽  
Soon Hock Ng ◽  
Tomas Katkus ◽  
Bruce C. C. Cowie ◽  
Saulius Juodkazis
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Surface Plasmon Polariton ◽  
Femtosecond Laser Ablation ◽  
Laser Pulses ◽  
Periodic Patterns ◽  
Fs Laser ◽  
Application Potential ◽  
Field Lines ◽  
The Magnetic Field

The femtosecond laser ablation of silicon amidst an externally applied magnetic field in different orientations was investigated with respect to the scanning direction and polarisation of the laser beam, by observation of ablation patterns and debris displacement in a range of fluences, magnetic fields strengths, and geometries. Ultra-short ∼ 230 fs laser pulses of 1030 nm wavelengths were utilised in the single and multi-pulse irradiation modes. Ablation with an externally applied magnetic B-field B e x t ≈ 0.15 T was shown to strongly affect debris formation and deposition. The mechanism of surface plasmon polariton (SPP) wave can explain the ablated periodic patterns observed with alignment along the magnetic field lines. The application potential of external field controlled ablation is discussed.

Specific features of penetration and trapping of a magnetic flux in film and bulk YBCO high-temperature superconductors

2018 ◽  
Vol 32 (31) ◽  
pp. 1850346
Author(s):  
Kh. R. Rostami
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Flux ◽  
External Field ◽  
High Temperature Superconductors ◽  
Interaction Mechanism ◽  
Differential Method ◽  
Bulk Ybco ◽  
The Magnetic Field ◽  
Insight Into

An oscillatory differential method of local diagnostics of superconductors is applied to the analysis of the trapped magnetic flux and the effective demagnetization factor in YBCO samples. Regular steps over certain intervals of the external field are observed on the magnetic-field dependence of these parameters. It is demonstrated that, as the external field increases, crystallites in a sample are decomposed into sub- and nanocrystallites with a size much less than the penetration depth [Formula: see text] of the magnetic field. The first critical thermodynamic magnetic fields of sub- and nanocrystallites are determined. These results allow one to reveal the interaction mechanism between magnetic and crystalline microstructures of superconductors and provide a deeper insight into the physical processes that occur in high-temperature superconductors (HTSCs) in a magnetic field.

FeNbVB ALLOY PARTICLES SUSPENDED IN LIQUID GALLIUM: INVESTIGATING THE MAGNETIC PROPERTIES OF THE MR SUSPENSION

2011 ◽  
Vol 25 (07) ◽  
pp. 947-955 ◽  
Author(s):  
GJERGJ DODBIBA ◽  
KENJI ONO ◽  
HYUN SEO PARK ◽  
SEIJI MATSUO ◽  
TOYOHISA FUJITA
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Iron Alloy ◽  
Testing Temperature ◽  
Liquid Gallium ◽  
Temperature Sensitive ◽  
Prepared Powder ◽  
Alloy Particles ◽  
The Magnetic Field

A MR suspension was prepared by dispersing silica-coated iron alloy particles into a liquid gallium. In other words, the iron alloy particles of 30 to 50 nm in diameter were first prepared and then coated with silica. Next, the particles were then suspended in a liquid Ga (assay: 99.9999%). In addition, the magnetic properties of the synthesized particles and suspension under the influence of the magnetic field were investigated. One of the main findings of this study is that the prepared powder showed a temperature sensitive of magnetization within the testing temperature range of 293–353 K. The saturation magnetization of silica-coated FeNbVB particles was about 0.55 T, whereas the saturation magnetization (297 K) of the synthesized MR suspension was 0.019 T.

SELF-MAGNETIZATION IN ELECTROWEAK VACUUM AND IN VERY DENSE SYSTEMS

2011 ◽  
Vol 20 (supp02) ◽  
pp. 168-175
Author(s):  
HUGO PÉREZ ROJAS ◽  
ELIZABETH RODRÍGUEZ QUERTS
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
External Field ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
W Bosons ◽  
Large Density ◽  
Electron Positron ◽  
Vector Bosons ◽  
The Magnetic Field

For charged vector bosons (W bosons) of mass mw, magnetization diverges for B → Bcw, which suggests that if the magnetic field is large enough, it can be self-consistently maintained. For photons bearing an anomalous magnetic moment, having a sufficiently large density, their contribution to magnetization might become of the same order than the applied external field, leading also to self-magnetization. We discuss these models in connection to the case of radiation in equilibrium at high temperature (T ~ mc2) coexisting with hot magnetized electron-positron pairs.

scholarly journals Magneto-Optical Characterization of Trions in Symmetric InP-Based Quantum Dots for Quantum Communication Applications

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 942
Author(s):  
Wojciech Rudno-Rudziński ◽  
Marek Burakowski ◽  
Johann P. Reithmaier ◽  
Anna Musiał ◽  
Mohamed Benyoucef
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Molecular Beam ◽  
Optical Parameters ◽  
Single Spin ◽  
Single Carrier ◽  
Out Of Plane ◽  
The Magnetic Field ◽  
G Factors

Magneto-optical parameters of trions in novel large and symmetric InP-based quantum dots, uncommon for molecular beam epitaxy-grown nanostructures, with emission in the third telecom window, are measured in Voigt and Faraday configurations of an external magnetic field. The diamagnetic coefficients are found to be in the range of 1.5–4 μeV/T2, and 8–15 μeV/T2, respectively out-of-plane and in-plane of the dots. The determined values of diamagnetic shifts are related to the anisotropy of dot sizes. Trion g-factors are measured to be relatively small, in the range of 0.3–0.7 and 0.5–1.3, in both configurations, respectively. Analysis of single carrier g-factors, based on the formalism of spin-correlated orbital currents, leads to similar values for hole and electron of ~0.25 for Voigt and ge ≈ −5; gh ≈ +6 for Faraday configuration of the magnetic field. Values of g-factors close to zero measured in Voigt configuration make the investigated dots promising for electrical tuning of the g-factor sign, required for schemes of single spin control in qubit applications.

Quantization on the circle

2006 ◽  
Vol 84 (5) ◽  
pp. 335-344
Author(s):  
M Merad
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Coherent State ◽  
Path Integral ◽  
Free Particle ◽  
Integral Approach ◽  
Topological Properties ◽  
Path Integral Approach ◽  
Second Stage ◽  
The Magnetic Field

We present, via the path-integral approach, the quantum study of a particle without spin constrained to move on a circle and subjected to the action of an external field (V, A). In the first stage, we follow the Faddeev–Senjanovic constraints technique that is essentially based on the Dirac algorithm; and in the second stage, we use the path-integral coherent state relative to the circle, compatible with the topological properties. In the two cases, the free particle and the problem of the magnetic field are shown as an illustrative calculation.PACS Nos.: 03.65–w, 03.65Ca, 03.65.Db

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