i'm trying to make a post for the last 3 days now but there is always something that stun locks me when i try to make a response. Yes, it's called pyrophoric iron, it even ignites spontaneously in air.
I did it for fun. 
that sounds counter productive  I think you must educate yourself on magnetic fields "pulling" magnets. It is not the field value that does the pulling, it is the field gradient, the field must change with distance through space. Place a magnet within a uniform magnetic field and there is no pull, only a torque that forces the magnet to align with the field. And yes, electrons in a non uniform field will act like tiny magnets to align themselves with the field and then get pulled towards the stronger field area. (That is if there is nothing in the way for them to collide with of course) oh true. i was not aware of that anymore - there needs to be a field gradient for magnets to pull on each other. in the video i linked about how permanent magnets work there is a 2nd part that explains how normal electro magnets work ( https://www.youtube.com/watch?v=1TKSfAkWWN0) but they do it in special way. they use special relativity and electric forces to explain magnetic forces. everything that moves relative to you gets smushed in the direction its moving so suddenly you can have concentrations of electric charges that were not there before. i guess this works with magnets pulling on each other as well. the moving electrons inside the magnetized iron see a concentration of positive electric charges inside the other magnetized piece of iron. It takes energy to pull a tiny magnet from a region of uniform field to a region where there is no field because over that movement the field must decay, that gradient creates the pull back force that has to be overcome. The energy can be reclaimed by letting the magnet be pulled back and capturing the energy. okay but how can you account for thatwhen it comes to energy input/output. the intial idea was to "capture" energy from the magnetic flux dip when you remove electrons from a magnetic atom. so you put in some work to remove an electron from an iron atom and in return you get some magnetic field change. the electron is the main contributer to the magnetic field of the atom. you have the magnetic field of the electron spin and you have magnetic field from the orbital motion. both disappear from the atom when you remove the electron. of course removing only one electron from an iron atom still leaves you with the other half-filled electron shells that do create an external field which you would have to overcome. the most extrem example would be to remove all the electrons from half-filled shells and only the full shells remain (magnetic fields of full shells cancel each other out). so now the magnetic field is basically zero and you dont have to work against it. and the electric energy you just used to remove the electron from the atom is preservered as much as possible in an oscillating circuit. the practical outcome would be to capture the magnetic flux change in the coil of the oscillating circuit itself so maybe the oscillation starts to swing up. This video is food for thought.
https://www.youtube.com/watch?v=AygyCYMVXlI&t=187s
Turning permanent magnets on and off with little energy.
I wonder............
i saw devices like that but i dont see how you can gain more energy from it than you have to put in by opening the "flux-circuit" although... i can never tell how much energy you can actually gain from flux changes in the first place... there is always the principle of... induction and counter induction/counter torque... a rotor of a generator pushing against the magnetic field of the stator coils it just induced power in when the stator circuit is closed... my brain is really bad at picturing how those things but - scratch that. i found it. a neat simulation that shows and animates everything about induction, winding direction, current flow! this thing has been on the internet for ages but it slips and reconnects to my brain in unpredictable ways  https://phet.colorado.edu/sims/cheerpj/faraday/latest/faraday.html?simulation=faradayi used the transformer tab to visualize what the idea should look like. in the simulation you have a battery with electrons flowing inside a coil and a secondary induction coil. you could compare this with the electrons "flowing" inside a permanent magnet. so now we remove the electrons from the magnet so the magnetic field gets weaker and weaker (in the simulation you move the voltage slider to reduce the voltage) causing an induction current in the second coil. this current amplifies the current magnetic field. well - now i'm not sure what that means for the electrons we try to remove. also the counter induction thing should kick in and... now i feel like getting stun locked again. someone take over please  counter induction should make it harder for electrons to flow inside the electromagnet/battery circuit but this cant affect electrons flowing inside atom orbitals right?
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Topic: turning a permanent magnet on and off and harnessing the flux change for power (Read 5285 times)
