Re: Cenco magnets: remagnetizing

[William Beaty <billb@eskimo.com>]

On Thu, 15 May 1997, Jerry Hester wrote:

> I tried this with our CENCO  bar magnets but failed miserably.  After
> several hours in a very large research magnet the bar magnets were
> stronger slightly than before but faded very quickly.  The next trial
> will involve heating the bar magnets and letting them cool in a large
> field.

An easier method: a big Neodymium PM can magnetize most anything but SmCo. 
Just stroke the NIB magnet along the bar magnet (or simply hold one NIB
magnet pole momentarily near one end of the bar magnet, then hold the
other pole near the other end.) 

I've used this to make NSN bar magnets.  Confusing, since both ends of the
resulting magnet attract the same end of a compass, and if you make two,
both poles will repel each other.  "Monopole" magnets!  ;) 


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