Ferrite silcon (FeSi) core pros? & cons? I'm hoping for some input here to brainstorm. My unlearned theory is that a plyable substraight, in this case a cylinder, will allow the magnetic domains to come off of its' alignment when influenced to do so by an external force/field. The external input can come from a permanent magnet swipe, a magnetic strip, induced field from primary coils, impulses from audio sources etc.... I guess I'll pose the first question. When magnetic domains are lined up in a NIB rare earth magnet or in a ceramic magnet... Are these domains lined up perfectly? If these lines of domains are only next to perfect in alignment, will this affect the over all strenght? And, even futher out, would it "turn off " meaning that the field would disappear altogether?