Liquid Permanent Magnets

25 views
Skip to first unread message

John Clark

unread,
Jul 19, 2019, 12:18:22 PM7/19/19
to everyth...@googlegroups.com
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

John K Clark

Philip Thrift

unread,
Jul 19, 2019, 1:52:38 PM7/19/19
to Everything List

The Liquid-Metal Effect in Terminator 2: Judgment Day (1991)



@philipthrift 

Lawrence Crowell

unread,
Jul 20, 2019, 4:05:44 PM7/20/19
to Everything List
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:

Brent Meeker

unread,
Jul 20, 2019, 8:25:06 PM7/20/19
to everyth...@googlegroups.com
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
--
You received this message because you are subscribed to the Google Groups "Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email to everything-li...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/febff93c-f3ec-4544-80d0-9a82fa08c39f%40googlegroups.com.

Lawrence Crowell

unread,
Jul 20, 2019, 9:59:51 PM7/20/19
to Everything List
On Saturday, July 20, 2019 at 7:25:06 PM UTC-5, Brent wrote:
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


Ferromagnetism depends on magnetic moments of electron spins and the angular momentum of the electron orbit, where energetically it is favorable for alignment. Lots of experiments have been performed to measure spins.

LC
 

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. 


John K Clark
--
You received this message because you are subscribed to the Google Groups "Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email to everyth...@googlegroups.com.
Reply all
Reply to author
Forward
0 new messages