All Questions
Tagged with material-science electromagnetism
132
questions
2
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1
answer
62
views
Why defects don't have an effective charge in metals?
In semiconductors and insulators, crystal defects, e.g., vacancies and interstitials, are treated as having an effective charge. In metals, however, defects are treated as neutral. I can expect that ...
- 191
0
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0
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25
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The absorption of infrared light for regular materials, like fabric wallets backpacks and clothes
I work as a brand partner for a company that produces a patch which strengthens the production of stemcells in the body.
The patches are activated with the help of the bodys own infrared radiation.
I ...
1
vote
0
answers
95
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What step is missing from this transformation of the Clausius-Mossotti relation into the Garnett-Maxwell equation?
When deriving the Maxwell-Garnett equation for composite systems (host material with dielectric particles disposed in it), the steps generally taken are
Step 1) Equate the Clausius-Mossotti equation ...
- 753
0
votes
1
answer
33
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Light acceleration method using inhomogeneous material mediia
Some time ago I posted this question but I reckon it was too vague. Nontheless, I've been working on it and I've come up with some interesting conclusions. My question is: can light be subject to an ...
- 1,616
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1
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28
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How does it work with permeability?
I have a question regarding the permeability for a material, if I have an electromagnet of two different materials. So also two different values for permeability, does the lowest value for ...
- 11
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0
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44
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Identifying symmetries of rank 2 tensors
Let's say I have a material with permittivity tensor: $$ \epsilon_1 = \begin{pmatrix} \epsilon_{xx} & \epsilon_{xy} & 0 \\
\epsilon_{xy} & \epsilon_{yy} & 0 \\
0 & 0 & \...
- 101
1
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0
answers
26
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Physical interpretation of a dielectric's absorption curve
A given dielectric will behave as an absorbing medium for some frecuencies (those near one of the material's several resonant frequencies), whilst it will behave as a non-absorbing medium for the rest ...
- 1,616
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17
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If a material is homogeneous in $\varepsilon$, can this material be made of different atoms?
I'm currently trying to derive the microscopic expression for the dielectric constant of a material following my proffessor's notes. However, he admits that, even though he assumes $\varepsilon=...
- 1,616
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26
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Determining the condcutivity of a material by method of contactless resistance caused by putting a sample rod in the inductor of an RLC circuit
I'm doing an experiment where I'm trying to determine the conductivity of a material by putting a sample rod in the center of a coil which is a part of an RLC circuit with an AC generator.
I was told ...
0
votes
1
answer
131
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Magnetic hysteresis curve does not form a closed loop?
Sometimes the hysteresis curves for magnetic materials that I see in articles have this noticeable discontinuity at the saturation points, the curve doesn't exactly close into a loop.
For the example ...
- 45
5
votes
3
answers
285
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“Emergent magnetic monopole” discovered (5th December 2023)
Looks like a few days ago (5th December 2023) a research team discovered “emergent magnetic charge” in antiferromagnetic materials, and the result was published on Nature Materials.
The finding was ...
- 687
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2
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40
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How strength of RF coupling depend on the antenna material?
If we place different materials in the microwave owen, they will get hot at different speeds. For instance meals get hot really fast. What material property decides on the strength of the coupling? ...
- 1
0
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0
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310
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Difference in magnetic permeability of High tensile strength steel and Mild steel
Mild steel has a relative magnetic permeability of 2000. High tensile steel is a type of mild steel with elements other than carbon. I need to know whether this would impact the relative permeability ...
- 13
1
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0
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105
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Fourier Transform of Dielectric Function in 2D
According to "Dielectric screening in two-dimensional insulators: Implications for excitonic and impurity states in graphane", https://doi.org/10.1103/PhysRevB.84.085406, the Fourier ...
0
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1
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34
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Can you perfectly control electric currents' behavior in anisotropic media?
I'm an undergrad who is learning recently about anisotropy w.r.t. E&M. I understand that in anisotropic media the behavior of electric currents and other E&M aspects can be very unpredictable ...
- 3