Demagnetization risk of Neo magnets in repel mode?

[Bulbz]

Try this experiment...

Get hold of a donut shaped magnet, one from the back of a loudspeaker will do just fine, and break it into two pieces. Now try and put the two pieces back together... They will repell each other apart. So the people that say magnets can not be used in repel mode, are they saying that a donut magnet de-mags all by it's self ?. Hmmm !.

[Honk]

Try this experiment...

Get hold of a donut shaped magnet, one from the back of a loudspeaker will do just fine, and break it into two pieces. Now try and put the two pieces back together... They will repell each other apart. So the people that say magnets can not be used in repel mode, are they saying that a donut magnet de-mags all by it's self ?. Hmmm !.

http://www.overunity.com/index.php/topic,2451.msg39543.html#msg39543

[Bulbz]

@ Honk...

Yeah, I understand the two magnets of equal size and strenght wont de-mag in repel mode, but... What if the two broken pieces are from the same magnet but are different sizes. Lets say that when the magnet is broken in two but one piece ends up as 1/3 of the parent magnet and the other piece is 2/3. Will the two un-equal parts of the same magnet de-mag each other in this scenario ?.

[Honk]

Good question. I don't know.... Perhaps someone else here can help?

[Nali2001]

I don't think that a static repulsive field like clamping 2 magnets together will change much, since the magnetic domains will 'holdup'. But when the repulsive field is pulsing it a different story, probably much like hammering a nail in wood. You can let a 200kg hammer rest on a nail and it won't sink the nail into the wood. Because the structure of the wood will 'holdup' the static pressure of the hammer. But you CAN take a 0.1kg hammer and hammer the nail with a rate or frequency and it will drive the nail in the wood. The actual 'action matters'
I thing...