# Material magnetisation

1. May 27, 2004

### drag

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.

2. May 28, 2004

### drag

hmm... some attention ?

3. May 28, 2004

### Gokul43201

Staff Emeritus
Could you be more specific, and restate your question in terms of B, H, M, and $$\mu$$ ?

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: May 28, 2004
4. May 28, 2004

### drag

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.

5. May 29, 2004

### drag

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...

6. May 29, 2004

Hahaha,
Will anyone be spared ?

7. May 30, 2004

### drag

Sure, those who pay up-front...

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