Permanent magnets have an excess of electron magnetic moments aligned
and so they must also have their spins aligned. Has anyone directly
measured the excess spin angular momentum of a permanent magnet?
Brent
On 7/20/2019 1:05 PM, Lawrence Crowell wrote:
It is spin-spin coupling, which must by some means be quite strong,
and this orientation is conserved even if the atoms are in motion. The
next step is whether a magnetized gas can exist.
LC
On Friday, July 19, 2019 at 11:18:22 AM UTC-5, John Clark wrote:
Ferrofluids have been around since 1963 but have only a modest
attraction to an external magnetic field and loose all magnetism
once the external field is removed. In today's issue of the
journal Science it is reported that for the first time a liquid
has been found that is Ferromagnetic, that is to say the
attraction to an external magnetic field is much stronger and even
more important it retains it's magnetism even when the external
field is turned off. A liquid permanent magnet could have
applications ranging from robot muscles to steering anticancer
drugs to a tumor.
An attractive, reshapable material
<https://science.sciencemag.org/content/365/6450/219>
John K Clark
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