Substitute Materials of Transformer Core?

[madans]

Greetings dear teachers,
First of all allow me to apologize since my native language is not English. I'm not a builder myself yet and a little confused where to ask. I haven't finished read all the previous info in this section/thread, but I think my questions somehow a little related (hopefully).

1. Is there any alternative about the substitute materials of transformer core? (beside iron&its family; air; plastic)
Some time ago I read an article that copper can also possible to be made into magnet.
https://www.researchgate.net/publication/280871157_Beating_the_Stoner_criterion_using_molecular_interfaces
have anyone tried?

2. Is there any related info about a kind of dynamic transformer? It is a kind of rotary transformer, with the core as the moving part like in a coil gun or particle accelerator.

3. Is it possible to power the load/r at the output using capacitor at the input (as a starter)?
Generally, like we know, transformer consist of 1 input winding/coil and 1 output coil/winding. I'm just confused about how actually the electromagnet induction works. Is it the rate of change of magnet flux? Is it possible for capacitor with low current to create a suitable magnet flux?

Here is what I want to try (have anyone tried it? what is the result?):
Supposed that we have a suitable core material/design and more than one input coil and one output coil,
then
t01.in01 to voltage source with limited current, such as capacitor; oscillator; f generator
t01.in02 to current source with limited voltage or voltage0 near 0 or in standby before input01 energized, such as battery; ground; spark gap; shorted (coil itself) *edit: ground>>earth(ing) ground/water
t01.out01 to output/load, such as lamp; motor; input coil/winding of transformer02 (t02.in01);
t02.in01 here as a power source (voltage and current source) of transformer02
t02.out01 to t01.in01 if t01.in02 is shorted/closed loop

Hope you in good condition, Thank you,
Anis