Moving magnet=AC, static magnet=DC ?

[dieter]

Well then, can you explain me why this remanent magnetism disappears then the loop is mechanicly opened? BTW. PMHs stick together for years.


I didn't want to discredit you and I also rely on accepted science, basicly. I just don't think it is Remanence in this case, unless the word is used for multiple things.


Regards

[gyulasun]

Hi Dieter,

I did not think you discredit me in any way, I simply meant you are free to refuse conventional science and explore and develop your own science. 

Regarding why the remanence magnetism disappears when a PMH loop is mechanically broken:  I have answered this in my above mail, see these quotes:

"in case a soft material is suddenly exposed to a huge current pulse like Nali2001 gave to his laminated transformator core, then many particles were arranged into their saturation state but due to the originally soft magnetic characteristic of the crystal structure, the particles would gradually retain to their unmagnetized state, while in case of a hard material structure this could not readily happen because of the lattice defects."

"Remanence is not exlusively the feature of permanent magnets: it is a feature of many so called 'hard' magnetic materials and can also be a temporarily feature of soft magnetic materials when they are overexcited, when their crytal structure is 'shocked' by heavy current pulses and their particles need time to recover to their 'soft' state."

It is okay that PMHs can stick together for years: until any magnetic effect from outside influences the particles of the material, these particles (domains, spins, whatever they are called) can rest in their position where the initial huge pulse forced them to turn. The moment you remove the keeper part of a PMH  (the keeper is also a temporarily kind of permanent magnet with many particles forced to a certain direction), you give a magnetic influence to the whole structure and this influence is already enough for most of the particles to return to their original state they acquired during the manifacturing process.  (The full U shaped core can also become a temporal horse shoe magnet of course.)

Regards,  Gyula