scholarly journals Spatial characterization of the magnetic field profile of a probe tip used in magnetic resonance force microscopy

2008 ◽  
Vol 92 (21) ◽  
pp. 214104 ◽  
Author(s):  
E. Nazaretski ◽  
E. A. Akhadov ◽  
I. Martin ◽  
D. V. Pelekhov ◽  
P. C. Hammel ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Field Profile ◽  
Magnetic Resonance Force Microscopy ◽  
Force Microscopy ◽  
Spatial Characterization ◽  
Magnetic Field Profile ◽  
The Magnetic Field

Optimization of Multilayered Bi-2223/Ag-Au Conductors for Current Lead Applications

1999 ◽  
Vol 13 (09n10) ◽  
pp. 1357-1362 ◽  
Author(s):  
L. Martini ◽  
F. Barberis ◽  
R. Berti ◽  
L. Bigoni ◽  
F. Curcio ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gold Alloy ◽  
Electrical Characterization ◽  
Field Profile ◽  
The Third ◽  
Magnetic Field Profile ◽  
Composite Conductors ◽  
Current Leads ◽  
The Magnetic Field

Multilayered Bi-2223 composite conductors fabricated by means of the "Accordion folding" method appear to be suitable for applications as current leads (CL). In this work, we report on the results of electrical characterization of silver-gold alloy sheathed Bi-2223 conductors up to 400 mm long, having a DC overall critical current density J c eng exceeding 3000 A/cm2 at 77 K. The I c evolution from the first to the third thermal treatment as well as the uniformity along the specimen lenght has been monitored. Lastly, calculations of the magnetic field profile across stacked multilayered Bi-2223 conductors are reported and discussed.

Dependence of the a-Si:H Defect Density of States on the Magnetic Field Profile of an Electron Cyclotron Resonance Microwave Plasma

1992 ◽  
Vol 258 ◽  
Author(s):  
F.S. Pool ◽  
J.M. Essick ◽  
Y.H. Shing ◽  
R.T. Mather
Keyword(s):  
Magnetic Field ◽  
Density Of States ◽  
Cyclotron Resonance ◽  
Electron Cyclotron Resonance ◽  
Microwave Plasma ◽  
Defect Density ◽  
Electron Cyclotron ◽  
Field Profile ◽  
Magnetic Field Profile ◽  
The Magnetic Field

ABSTRACTThe magnetic field profile of an electron cyclotron resonance (ECR) microwave plasma was systematically altered to determine subsequent effects on a-Si:H film quality. Films of a-Si:H were deposited at pressures of 0.7 mTorr and 5 mTorr with a H2/SiH4 ratio of approximately three. The mobility gap density of states ND, deposition rate and light to dark conductivity were determined for the a-Si:H films. This data was correlated to the magnetic field profile of the plasma, which was characterized by Langmuir probe measurements of the ion current density. By variation of the magnetic field profile ND could be altered by more than an order of magnitude, from 1×1016 to 1×1017 at 0.7 mTorr and 1×1016 to 5×1017 at 5 mTorr. Two deposition regimes were found to occur for the conditions of this study. Highly divergent magnetic fields resulted in poor quality a-Si:H, while for magnetic field profiles defining a more highly confined plasma, the a-Si:H was of device quality and relatively independent of the magnetic field configuration.

scholarly journals Non-stationarity of the quasi-perpendicular bow shock: comparison between Cluster observations and simulations

2011 ◽  
Vol 29 (2) ◽  
pp. 263-274 ◽  
Author(s):  
H. Comişel ◽  
M. Scholer ◽  
J. Soucek ◽  
S. Matsukiyo
Keyword(s):  
Magnetic Field ◽  
Bow Shock ◽  
Field Profile ◽  
Mass Ratio ◽  
Poynting Flux ◽  
Magnetic Field Profile ◽  
Low Mass ◽  
Low Mass Ratio ◽  
The Waves ◽  
The Magnetic Field

Abstract. We have performed full particle electromagnetic simulations of a quasi-perpendicular shock. The shock parameters have been chosen to be appropriate for the quasi-perpendicular Earth's bow shock observed by Cluster on 24 January 2001 (Lobzin et al., 2007). We have performed two simulations with different ion to electron mass ratio: run 1 with mi/me=1840 and run 2 with mi/me=100. In run 1 the growth rate of the modified two-stream instability (MTSI) is large enough to get excited during the reflection and upstream gyration of part of the incident solar wind ions. The waves due to the MTSI are on the whistler mode branch and have downstream directed phase velocities in the shock frame. The Poynting flux (and wave group velocity) far upstream in the foot is also directed in the downstream direction. However, in the density and magnetic field compression region of the overshoot the waves are refracted and the Poynting flux in the shock frame is directed upstream. The MTSI is suppressed in the low mass ratio run 2. The low mass ratio run shows more clearly the non-stationarity of the shock with a larger time scale of the order of an inverse ion gyrofrequency (Ωci): the magnetic field profile flattens and steepens with a period of ~1.5Ωci−1. This non-stationarity is different from reformation seen in previous simulations of perpendicular or quasi-perpendicular shocks. Beginning with a sharp shock ramp the large electric field in the normal direction leads to high reflection rate of solar wind protons. As they propagate upstream, the ion bulk velocity decreases and the magnetic field increases in the foot, which results in a flattening of the magnetic field profile and in a decrease of the normal electric field. Subsequently the reflection rate decreases and the whole shock profile steepens again. Superimposed on this 'breathing' behavior are in the realistic mass ratio case the waves due to the MTSI. The simulations lead us to a re-interpretation of the 24 January 2001 bow shock observations reported by Lobzin et al. (2007). It is suggested that the high frequency waves observed in the magnetic field data are due to the MTSI and are not related to a nonlinear phase standing whistler. Different profiles at the different spacecraft are due to the non-stationary behavior on the larger time scale.

scholarly journals Dynamic nuclear polarization in a magnetic resonance force microscope experiment

2016 ◽  
Vol 18 (13) ◽  
pp. 8806-8819 ◽  
Author(s):  
Corinne E. Issac ◽  
Christine M. Gleave ◽  
Paméla T. Nasr ◽  
Hoang L. Nguyen ◽  
Elizabeth A. Curley ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Field Gradient ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magnetic Field Gradient ◽  
Magnetic Resonance Force Microscopy ◽  
Force Microscopy ◽  
Microwave Assisted ◽  
Magnetic Resonance Force Microscope

Microwave-assisted dynamic nuclear polarization in a magnetic field gradient using magnetic resonance force microscopy.

Evolution of the magnetic-field profile inTl2Ba2CuO6:Consequences for the second magnetization peak

1999 ◽  
Vol 59 (21) ◽  
pp. 13635-13638 ◽  
Author(s):  
S. Anders ◽  
Ming Xu ◽  
H. M. Jaeger ◽  
T. W. Li ◽  
D. G. Hinks
Keyword(s):  
Magnetic Field ◽  
Field Profile ◽  
Magnetic Field Profile ◽  
The Magnetic Field ◽  
Second Magnetization Peak
Sign in / Sign up

Export Citation Format

Share Document