Non-Joulian Magnetostriction

The researchers, Harsh Deep Chopra, professor and chair of mechanical engineering at Temple, and Manfred Wuttig, professor of materials science and engineering at Maryland, published their findings, "Non-Joulian Magnetostriction," in the May 21st issue of the journal, Nature (DOI:10.1038/nature14459).

"We have discovered a new class of magnets, which we call 'Non-Joulian Magnets,' that show a large volume change in magnetic fields," said Chopra. "Moreover, these non-Joulian magnets also possess the remarkable ability to harvest or convert energy with minimal heat loss."

"The response of these magnets differs fundamentally from that likely envisioned by Joule," said Wuttig. "He must have thought that magnets respond in a uniform fashion."

Chopra and Wuttig discovered that when they thermally treated certain iron-based alloys by heating them in a furnace at approximately 760 degrees Celsius for 30 minutes, then rapidly cooled them to room temperature, the materials exhibited the non-Joulian behavior.

The researchers found the thermally treated materials contained never before seen microscopic cellular-like structures whose response to a magnetic field is at the heart of non-Joulian magnetostriction. "Knowing about this unique structure will enable researchers to develop new materials with similarly attractive properties," Wuttig added.

Source


Sounds like we are on the verge of making very,very small motors?

Any thoughts?

Sounds exactly like the process for tempering swords.

So what, magnetic swords. That could be a lot of fun. Two swords stuck together while the combatants stare into each others eyes with the death stare.

Now .... about folded steel swords ...

P

a reply to: pheonix358

Actually and from the same source....

The researchers noted that conventional magnets can only be used as actuators for exerting forces in one direction since they are limited by Joule magnetostriction. Actuation, even in two directions, requires bulky stacks of magnets, which increase size and reduce efficiency. Since non-Joulian magnets spontaneously expand in all directions, compact omnidirectional actuators can now be easily realized, they said.

Because these new magnets also have energy efficient characteristics, they can be used to create a new generation of sensors and actuators with vanishingly small heat signatures, said the researchers. These magnets could also find applications in efficient energy harvesting devices; compact micro-actuators for aerospace, automobile, biomedical, space and robotics applications; and ultra-low thermal signature actuators for sonars and defense applications.

An actuator is a type of motor that is responsible for moving or controlling a mechanism or system.

It is operated by a source of energy, typically electric current, hydraulic fluid pressure, or pneumatic pressure, and converts that energy into motion. An actuator is the mechanism by which a control system acts upon an environment. The control system can be simple (a fixed mechanical or electronic system), software-based (e.g. a printer driver, robot control system), a human, or any other input.

Source

So no the OP is not about swords.

Any thoughts?

a reply to: Kashai

by heating them in a furnace at approximately 760 degrees Celsius for 30 minutes, then rapidly cooled them to room temperature

That is the process for tempering a blade.

So ... could you then magnetize a blade treated in this manner and end up with this affect.


P

a reply to: pheonix358

I would say that one would have a sword that could carry an electrical charge in a rather efficient way as long as one had the precise formula for the "iron based alloys".

Coupled with a powerful enough power source conceivably the sword would generate an electrical current on its surface.

A new weapon for "Mortal Combat" or a "Judge Dredd" type gun, that would shock any user it was not compatible with.

This news seems as significant as the Herbert-smithite discovery. Can't wait til this swag us applied to nanotech .

Omnidirectional magnets...and to think they said a magnet based overunity device was impossible.

Omnidirectional magnets would allow for the attract and repulse phase without physical movement of the magnets...properly arrange the lines of magnetic force, this could mean an energy device that could actually generate 'free' energy.

Maybe..

originally posted by: MysterX
Omnidirectional magnets..

The article talked about onmidirectional actuators, not omnidirectional magnets.

Since non-Joulian magnets spontaneously expand in all directions, compact omnidirectional actuators can now be easily realized

Actuators may use magnets, but they aren't the same thing, kind of like your car uses gasoline but your car isn't gasoline.

Wouldn't this aid Gauss weapon systems as well?,perhaps magnetic containmemt of anti matter?

a reply to: cavtrooper7

The comprehension of this rather fundamental development is a "game changer", with respect to all sorts of technology known today.

In response to your question I would say yes.


Any thoughts?

originally posted by: pheonix358

So ... could you then magnetize a blade treated in this manner and end up with this affect.


P

If you were using iron-gallium alloy, I suppose. Might not hold an edge.

originally posted by: MysterX
Omnidirectional magnets...and to think they said a magnet based overunity device was impossible.

It is. This isn't an omnidirectional magnet, though.

It's a material that changes volume as well as shape in a magnetic field. Not a huge amount, though.

originally posted by: Kashai
a reply to: pheonix358

I would say that one would have a sword that could carry an electrical charge in a rather efficient way as long as one had the precise formula for the "iron based alloys".

It's got nothing to do with charge.

What's different is that the material shows a volume change in a magnetic field. That's the difference. That's all the difference is. It's handy if you're building little hydraulic actuators, or a sonar head.

originally posted by: cavtrooper7
Wouldn't this aid Gauss weapon systems as well?,perhaps magnetic containmemt of anti matter?

Only if those things required a material that was real efficient in changing volume (very slightly) in a magnetic field. I can't envision it. You generally would want to reduce any magnetostriction whatever in a rail gun. And a Penning trap doesn't use anything like that.

originally posted by: Bedlam
It's a material that changes volume as well as shape in a magnetic field. Not a huge amount, though.

I was looking for some indication of the amount in the article but if it's there I didn't see it. How much is "not a huge amount"? 10% change in volume?

Let take a look at a PDF on the topic....

The 180 degree Bloch walls oriented along a magnetically easy direction generate the demagnetized state of a thin circular ferromagnetic plate, Extended Data Fig. 5a. If the magnetostriction of the material equals zero the Bloch walls may be considered laminates of two 90 degree walls.

Therefore, the spontaneous magnetization at the center of the 180 degree walls is directed normal to the walls. This fact is of little consequence as long as λ100≪1. However, it becomes significant if λ100 is finite as it does in the Fe-Ga, Al, Ge family. In this case, a significant stress arises in the center of the 180 degree Bloch walls causing the crystal to twin thereby forming the state we discovered.

Source

Nature article/abstract/free and open to public

The full article is available for $32.00 at Nature unless one has a subscription.

Any thoughts?

a reply to: Bedlam


I was offering that this material if used as the members asked would conduct an electrical current much better that the typical standard, with respect to a sword.

a reply to: Kashai

If WE know I would say it's already in a pipeline with an unseen system.

a reply to: cavtrooper7

I certainly welcome speculation.

a reply to: Kashai

I wonder what it would look like if we whipped all of this stuff out but I wouldn't like to see an EMERGENCY requiring it.