Why a permanent magnet does not lose magnetism when magnetizeing iron/ferrite

[Low-Q]

In other words : does magnetization require energy to be spent ? I believe, yes and I believe it needs it continuously to fight against gravity.

You believe, but do you KNOW?
When you hook up your clothings for the night, is it energy that keeps them hanging there over night, or is it a counterforce that keeps them there?
So many confuse force with energy. As long the magnet sticks to the fridge, and do not move, work is not done, nor any energy involved 


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[lancaIV]

I believe yes,there is the need of energy to become two materials bonded,up this moment there is no more need to spend energy (closed magnetic cycle)


                                        on/off-switch magnet
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[ageofmagnetizm]

Magnetic fields of a permanent magnets depends on coincidence of spins of electrons of atoms of a magnet. This coincidence
depends on alignments of magnetic domains (sort of crystals) inside of a magnet. When a magnet is engaging other ferromagnetic
block - then electrons of a block tends to align its spins with applied magnetic fields causing that magnetic domains rearrange
to align its magnetic poles with attracting poles of applied magnet. This cause magnetization of ferromagnetic block.
While, during magnetization - magnetic domains of applied magnet remain unchanged as its magnetic fields do.
For demagnetization of a permanent magnet - it is necessary to apply other, stronger magnetic fields which will repeal poles of
a magnet - then its magnetic fields will begin rearrangement so that magnetic domains will have theirs magnetic poles attracting
magnetic poles of a stronger magnet. Once that magnetic field of a ferromagnetic block are weaker than fields of a permanent magnet -
then domains of a magnet remains unchanged, and domains of a block change...

[verpies]

Ask yourself a question:
"Why an ideal shorted energized coil does not lose magnetism when magnetizing iron/ferrite ?"

[Low-Q]

Ask yourself a question:
"Why an ideal shorted energized coil does not lose magnetism when magnetizing iron/ferrite ?"

An ideal coils that has no resistance at all, will have solely current flowing through it all the time.
Electric current cannot carry energy by its own, so there is no energy to loose. In order to get energy, you must involve voltage.
Current is the medium, and voltage is the pressure. In a normal coil you must apply "pressure" to keep the electrons flowing through the coil. While an ideal coil without resistance, there is no need for pressure to sustain the electron flow.


Magnetizing an object does in other words not involve energy, but the normal non-superconductive coils used to magnetize magnets will use energy because the coils isn't ideal, and need voltage to sustain the flow of current.


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