Ramesh Mani, professor of physics and astronomy at Georgia State University, reports that, in the presence of a magnetic field, negative resistivity can produce a positive resistance, along with a sign reversal in the Hall effect, in GaAs/AlGaAs semiconductor devices.Georgia State University...
Why are there positive and negative electrical charges, while magnetic poles always seem to be bound together? Maxwell's Equations Maxwell's equations are the mathematical expression of electromagnetic laws. We have to understand electromagnetism as physics in genera...
fields above which the in-plane MR changes from positive to negative; it has been established23 that Hpeak(T) ~ Hc2(T), i.e. the upper critical field. The error bars reflect the uncertainty in defining the MR peak within our experimental resolution (see inset of Supplementary Fig. ...
In actual practice, it is generally necessary to acquire signal data from both positive and negative sides of k-space. In order to do this, data are collected during symmetric echoes, with the center point of the echo corresponding to k = 0. There are two general techniques to do this, ...
Sign in to download full-size image Fig. 9.15.An equatorial view of the magnetosphere with a southward IMF. The dawn-side magnetopause must carry a negative charge as a terminus of the interplanetary electric field (IEF), by Gauss's law; the charge is positive at dusk for the continuation...
Accordingly, OPV design should target to accomplish small spatial diffusion of CT states to maximise singlet-triplet energy separation, hence increasing the positive impact a magnetic field without going out of resonance. Due to the Zeeman splitting, it could also be argued that the higher triplet ...
It has been shown that the photoconductivity of the 2D electron gas is an oscillating function of the ratio of the radiation frequency to the cyclotron frequency and, depending on this ratio, can be both positive and negative. The theory predicts the possibility of observation of magnetoresistance...
The external magnetic field and magnetic field exist inside the organisms can bring positive or negative effect to the metabolism of living organisms and organization, which is named magnetic biological effect (Moore, 1979). Since 1960s, the effect of magnetic field on the microorganisms has been ...
Magnetic susceptibility, expressed in parts per million (ppm), is a measure of the tendency of a material to interact with and distort the main magnetic field (B0).9 Negative susceptibility values indicate magnetism that opposes B0, or diamagnetism, and positive susceptibility values indicate the ...
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