Are magnets affected by cold?

[riggerrob 558]

Are magnetic riser covers affected by sub-freezing temperatures?
Let's hear from Jerome Bunker and UPT.

[councilman24 36]

The magnetism should increase, slightly, in cold temperatures someone would jump at. It would decrease slightly at hot temperatures. None of the changes should be noticable.

I'm old for my age.
Terry Urban
D-8631
FAA DPRE

[NovaTTT 1]

Quote

Are magnetic riser covers affected by sub-freezing temperatures?
Let's hear from Jerome Bunker and UPT.

The magnetic properties aren't significantly affected.

Magnetic fields become stronger in increasingly colder temperatures, but in terms of equipment use and the temperatures at which it is used, the effect is not significant.

Conversely, magnetism diminishes and can even dissipate at high temperatures, but not the temperatures at which the equipment is used (or could even survive).

In terms of the physical properties? The magnets themselves are physically unaffected by typical "sub-freezing" temperatures. Temperatures that one would consider to be significantly "sub-freezing", say
If the sub-zero temperatures are chemically induced, say by liquid nitrogen, refrigerant, etc., then one's concern would be the compromising of the equipment, not the magnets, but that's another topic, I suspect.

I hope this is helpful.


(edited for spelling)

"Even in a world where perfection is unattainable, there's still a difference between excellence and mediocrity." Gary73

[BKR 0]

Magnet by its nature can loose completely its magnetism or not at all when exposed to cold, real cold. Magnets are mainly made in samarium-cobalt, alnico, more rarely in néodynium-fer-bore (sorry I do not know the name in English of these materials). These mixed materials are not affected by cold, real cold even in a cryogenisation status. Water doesn't affect magnetism too and most of the stainless and steel are treated by cryogenisation to reinforced their structure during the forging process.

Jérôme Bunker
Basik Air Concept
www.basik.fr
http://www.facebook.com/pages/Le-Luc-France/BASIK-AIR-CONCEPT/172133350468

[JohnRich 4]

Quote

Are magnetic riser covers affected by sub-freezing temperatures?

Maybe it's the stiffness of the fabric riser covers that changes in cold weather, making it seem like it's the magnets.

[LaRusic 0]

Caution, scientific content




"Cold can have an effect on magnetism, because old can have an effect of how fast charged particles move. It is the motion of charged particles, usually
electrons around a nucleus, that produces magnetic fields. Cooling a metal can make the motion within less random, thus allowing more atoms to line up
with each other. This increases the magnetic field of the material. On theother hand, making a magnet very hot will cause more random motion, resulting in less allignment of molecules and less megnetism.

Kenneth Mellendorf PhD Nuclear Physics"

The Altitude above you, the runway behind you, and the fuel not in the plane are totally worthless
Dudeist Skydiver # 10

[Sangi 0]

You guys go into such detailed bla bla bla scientific mumbo jumbo..

The guy only wants to know if his magnetic riser covers will work properly when he jumps during the winter

"Dream as you'll live forever, live as you'll die today." James Dean

[billvon 2,416]

>The guy only wants to know if his magnetic riser covers will work properly
>when he jumps during the winter.

Simple answer - they will not be noticeably affected by the cold, and will work about as well as they work when it's warm.

[erdnarob 1]

Glad to see another person involved in physics being a skydiver. After all-skydiving is applied physics. Ok the guy wants to know if the magnets of his riser cover will be affected during the winter. The answer is NO (as long he is jumping at the surface of the Earth).
But in my mind, this forum is for exchanging ideas and to propagate knowledge.

Now for the why it is like that, well LaRusic is giving the answer. In other word we have to know the origin of the magnetism first.
In atoms, there are electrons spinning around the nucleus. Each electron because of its spin (+ or -) (rotation about itself clockwise or counterclockwise) creates magnetism and acts like a magnet bar (with a South and a North pole). Alright so far. Generally in an atom, the number of electrons with a spin + matches the number of electrons with a spin - and if that happens the total magnetism is zero or neutral. However some atoms have not their spin + and spin - matched or equal and therefore the atom itself becomes a very small magnet. Now put a lot of those special atoms (like a piece of iron) and align them in the same direction (with a strong electromagnet) and you have what we call a magnet. Now the temperature of a material is an indication of the atoms vibration in a solid for instance. More temperature more vibration. At a certain temperature, the Curie point, the vibration is such that the material loses completely its magnetism because too intense vibration is not allowing the aligment of the atoms anymore. On the other hand if you get the material cold (as LaRusic says) the magnetism will increase since the atoms vibration slows down and that way keeps a better alignment. For Jerome now, we have NEODYMIUM, IRON and BORON in English.
Canada eh !.

Learn from others mistakes, you will never live long enough to make them all.

[BKR 0]

For Jerome now, we have NEODYMIUM, IRON and BORON in English.
Canada eh !Cool.

It was too late too translate.

Jérôme Bunker
Basik Air Concept
www.basik.fr
http://www.facebook.com/pages/Le-Luc-France/BASIK-AIR-CONCEPT/172133350468