Magnetic coils and permeability

[fonograph]

Imagine the Qi charger,two copper coils being close transfer energy by magnetic induction.There is a coupling factor based on the coil size,shape,distance and orientation.More coupling = more efficient energy transfer.

My question is,what if the recieving coil was made from some ferromagnetic type material like iron or nickel? Copper have permeability 1,the nickel or iron will be much higher.Would it increase the coupling factor? I know iron have lower conductivity than copper,   and I think magnetic hysteresis losses will also be thing,but isnt generaly higher permeability of the reciever coil going to increase the near-field magnetic induction coupling factor and therefore efficiency?

What if the recieving coil was made from some magic material that have same conductivity as copper,no hysteresis loss and permeability 100,will that increase the coupling?

[T3sl4co1l]

No, or not very much.  The coil's wire is perpendicular to the flux, therefore little mutual flux flows.

The Q factor will also be pitiful, because those materials have very high AC resistance.

Tim