[SI-LIST] Re: relative magnetic permeability of tungsten, molybdenum... proving hard to find
- From: "Tabatchnick, Justin" <justin.tabatchnick@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 7 Nov 2003 13:24:27 -0800
If you know the magnetic path length (l) and the area (A) through which
the magnetic flux passes then reluctance =3D Mu(l)/A and suseptance is
just the inverse=20
Justin , Intel
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of D G
Sent: Friday, November 07, 2003 11:09 AM
To: si-list@xxxxxxxxxxxxx
Cc: si-list-bounce@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: relative magnetic permeability of tungsten,
molybdenum... proving hard to find
I doubt the differences from 1 will affect any calculations. But just
in case...
I noticed that magnetic susceptibility is more commonly given for metals
rather than permeability. Is there a way to calculate permeability from
susceptibility?
Daniel
From: "Bart Bouma" <bart.bouma@xxxxxxxxx>
> Hi all,=20
> I'm not a specialist on this too, but some materials are used in
MLCCs.
>=20
> This is what I wrote to Mark:
>=20
> " Nickel is a ferro-magnetic metal: these have high permeability
values=20
> (upto 800,000 for alloys)
>=20
> Gold, copper, silver etc. are diamagnetic materials: relative
permeability=20
> just below 1.
>=20
> Gold: 0.99996
> Copper: 0.99999
>=20
> Paramagnetic materials: values for relative permeability also around
1,=20
> but just above.
> e.g. Palladium is a material belonging to the last category:
(Palladium:=20
> ur =3D 1.00078)
>=20
> Sorry, but I didn't find values for molybenum and tungsten, but I
think=20
> (!) that these are either diamagnetic or paramagnetic materials.
> So take ur =3D 1. "=20
>=20
>=20
> best regards, Bart Bouma
> appl. eng. MLCC & X2Y
> www.yageo.com
>=20
>=20
>=20
>=20
>=20
> "Knighten, Jim L" <JK100005@xxxxxxxxxxxxxxxx>
>=20
> 07-11-03 00:55
> Sent by: si-list-bounce@xxxxxxxxxxxxx
>=20
> Please respond to JK100005
>=20
> =20
> To: mark.walker@xxxxxxxxxxxxxxxx
> si-list@xxxxxxxxxxxxx
> cc:=20
> Subject: [SI-LIST] Re: relative magnetic permeability
of tungsten, molybde num...=20
> proving hard to find
> Category:=20
>=20
>=20
>=20
> Mark,
>=20
> I'm not an expert, but I think that gold, molybdenum, and tungsten
have
> relative permeabilities of 1. I don't believe they are magnetic.
>=20
> Jim
>=20
> ________________________
> James L. Knighten, Ph.D.
> Teradata, a division of NCR http://www.ncr.com
> 17095 Via del Campo
> San Diego, CA 92127
> tel: 858-485-2537
> fax: 858-485-3788
>=20
>=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]=20
> On
> Behalf Of WALKER, Mark
> Sent: Thursday, November 06, 2003 9:11 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] relative magnetic permeability of tungsten,=20
> molybdenum...
> proving hard to find
>=20
>=20
> All, can you help me out with the relative magnetic permeability of a
few
> conductors?
>=20
> I've spent most of the afternoon using google and searching through
the
> numerous engineering, physics & chemistry handbooks in our library,
all to
> no avail. I'm looking at materials used for MCM conductors plus a few=20
> others
> for comparison, with a view to analysing the effects on multi-gigabit=20
> serial
> link type signals.
>=20
> Ideally, I'd like to complete the following list for relative magnetic
> permeability, Ur:
>=20
> copper, Ur =3D 1.
> gold
> molybdenum
> tungsten
> nickel, Ur in the range 5 to 20 (assume 10) at 1 GHz (see Johnson &=20
> Graham,
> black magic 2, p267).
>=20
> However, even if such figures are forthcoming, are they close enough
to=20
> the
> paste like compounds used for MCM conductors?
>=20
> Cheers,
> Mark.
>=20
> Stevenage,
> England.
--=20
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