Material Permeability & Magnetization: High-Field Induction

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Discussion Overview

The discussion revolves around the properties of materials with high magnetic permeability, specifically focusing on their behavior in external magnetic fields. Participants explore the characteristics of such materials that are not ferromagnetic and their response to varying field strengths, particularly in the context of low induced fields.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about materials that exhibit high magnetic permeability without significantly increasing the external magnetic field.
  • Another participant suggests the existence of materials that require high external fields to induce strong internal fields, contrasting this with iron's response to lower fields.
  • A later post seeks clarification on the original question by requesting specific terms related to magnetic fields, such as B, H, M, and μ, indicating a potential contradiction in the initial statement.
  • One participant refines their question to specify a desire for materials that have high permeability but induce low fields, particularly under external fields below 100 Gauss.
  • Another participant mentions finding specific data on Mumetal, which reportedly has a high induction ratio at low external fields, suggesting it may meet the criteria discussed.

Areas of Agreement / Disagreement

The discussion remains unresolved, with participants expressing different perspectives on the properties of materials with high permeability and their induced fields. There is no consensus on the existence or characteristics of such materials.

Contextual Notes

Participants have not fully clarified the definitions or assumptions regarding magnetic permeability and induction, which may affect the interpretation of the discussion. The specific conditions under which materials exhibit the described behaviors are not fully explored.

drag
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Greetings !

I was wondering if there are materials that have
high magnetic permeability, yet aren't really ferromagnets -
would not considrably increase the external field ?

Alternatively, how about materials with high permeability
that need relatively high fields to induce their own strong
fields. For example, iron in magnetic field of a few Gauss will
already produce a 1 T field, so how about materials that will
need say hundreds of Gauss before they're really induced
to Tesla scale field magnitudes ?

Thanks a lot.

Live long and prosper.
 
Physics news on Phys.org
hmm... some attention ? :biggrin:
 
Could you be more specific, and restate your question in terms of B, H, M, and [tex]\mu[/tex] ?

There appears to be an apparent contradiction in the statement of your problem, but I'm going to wait till you rewrite it.
 
Last edited:
Maybe my question was somewhat confusing.
But it's simple really - I'm looking for a material with
high permeability and low induced field. Or alternatively,
high permeability and low induced field at least when the
external field is below, say, 10^-2 T (100 Gauss).
(Low, in this case, would be say - up to 100 times
the external field at most.)

Thanks. :smile:
 
Ah... never mind, found the numbers on one type of
Mumetal, something like 1 to 300 induction at a few Gauss,
fits my secret weapon plans... :biggrin:
 
Hahaha,
Will anyone be spared ?
 
Sure, those who pay up-front... :biggrin:

btw, nice to have you back BH, haven't seen you around
for some time now. :smile:
 

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