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From: tan@ihlpg.UUCP (Bill Tanenbaum - AT&T Bell Labs - Naperville IL)
Newsgroups: net.physics
Subject: Re:  Michelson Morley experiment (Actually magnetism)
Message-ID: <856@ihlpg.UUCP>
Date: Mon, 15-Jul-85 13:32:05 EDT
Article-I.D.: ihlpg.856
Posted: Mon Jul 15 13:32:05 1985
Date-Received: Wed, 17-Jul-85 06:19:06 EDT
References: <392@sri-arpa.ARPA>
Organization: AT&T Bell Laboratories
Lines: 12

> From:  Doug Gwyn (VLD/VMB) 
> 
> The field of a bar magnet is due primarily to aligned nuclear spins
> (actually, there are lots of magnetic "domains" each with aligned
> nuclei), not electron spins, if I recall my solid state courses
> correctly (it's been a long time).

The field of a bar magnet is due to aligned electron spins of a small
number of outer electrons.  The magnetic moment of the nucleus is
negligible compared to that of the electron.
-- 
Bill Tanenbaum - AT&T Bell Labs - Naperville IL  ihnp4!ihlpg!tan