Permanent Magnet: ON/OFF Mechanism...

[kentoot]

hi guys, this is my first post 

Anyway, I did try this experiment using a ceramic magnet, conductive epoxy and a 15 MHz function gen, but cant make it to work.

conductive epoxy :
http://www.chemtronics.com/products/product.asp?id=33

HP function generator :
tried all sort of waveform (square,sawtooth,sine) with different frequencies (50,60,180,180K,1M etc.), also with different amplitude (1v, 5v, 10v) and with different wave voltage offset, still nothing !! btw, my function gen only allows 10vp-p, maybe that's the reason

Well, I'm out of ideas, unless given more detail about the whole setup.

Although you can control ferromagnetic property using electric field :
http://www.ohno.riec.tohoku.ac.jp/english/Research_toptst-file/spinpheno-file/FET/FET.html
http://www.iop.org/EJ/abstract/0953-8984/16/48/029

[Dingus Mungus]

 

Why are people going through and removing or editing their posts?!?!?!

:: looks at tao ::

Seriously, even if the post was worthless to you, others might be interested in reading it.

[CLaNZeR]

Seeing the first post in this thread has been removed I decided to have a hunt around and I think it went along these lines below:

**Quoted from another source**

on/off switch for permanent magnet

Ever considered whether it?s possible to turn a *permanent* magnet on/off at will ?

Well now you can, and those who are astute enough will realise how this can be used in motors, generators etc.

How is it done ? Simply apply a 180khz square wave current directly through the magnet at right angles to the magnetic field. Only a small current is required at a voltage of 12-20Volts.

Take a magnet, and ensure any protective metal coating is removed (e.g. most neodymiums have a metal layer over them). Then connect two wires, one to either side of the magnet at right angle to the direction of the magnetic field. Use conductive epoxy to do this. Then cover the whole magnet in an epoxy layer.

Then connect these wires to a simple square wave generator circuit, capable of going up to 250khz. At around 180khz you?ll notice the power of the magnet significantly reduced (to virtually zero).

An easy way to view this is to place another magnet in a tube, in such a way that it cannot rotate. With the other magnet with the wires attached oriented with North up. And the magnet in the tube oriented North DOWN. Place the tube on top of the other magnet. Thus the magnets repel.

As the tune your circuit up to 180khz you?ll be able to the see the repelled magnet lowering as the magnetic field diminishes. Switch off the current and the magnet in the tube leaps back up as it is repelled once again. The strength of the magnet does not appear to deteriorate even over many thousands of cycles.

Note I?m talking about a CURRENT being applied through the magnet NOT another magnetic field being applied at right angles using a coil or such like.

[attack duck]

  Sorry to drag this dead thread out of the grave, but it looks doable after all. 

"Our discovery will enable transformer cores with tunable inductances, and permanent magnets whose ability to hold objects can be switched on and off," 

http://www.eetimes.com/showArticle.jhtml;jsessionid=AE4FO4DZTRMOMQSNDLOSKH0CJUNN2JVN?articleID=201310704

[gaby de wilde]

hi guys, this is my first post 

Welcome to the forum. 

Maybe this is interesting here.

camster6:
Hans Coler claims the electron is a south pole.... more info Hans Coler claims the electron is a south pole. Physics teaches us the electron is a small magnet containing a north and south pole. Some test on the Hans Coler claim.

http://www.youtube.com/watch?v=qII_gsz-7ec

http://www.youtube.com/watch?v=0qBCHjai7Os