eclecticsynergy
Well-known member
If the polarities are the opposite and they attract, they should not demagnatize even in contact. Forcing like/repelling poles together will demagnatize one or both magnets, but I believe it takes time.
Partial degaussing can happen instantaneously with a stronger mag affecting a weaker one. As you said, only when like-to-like polarity repels.
People used to mellow their A5 humbucker bars by touching an opposing A8 to them for just a moment.
Ceramic can degauss alnicos significantly, immediately upon contact.
Neo mags can do it instantly from several inches away.