Given a nail, and a magnet it is possible to magnetize the nail by patiently rubbing the nail until it is magnetized; albeit the field strength may be less than that of the source.
With several score kilograms of space debris in orbit, all ferromagnetic material up there may each well have been subjected to several thousand revolutions around their primary; some sooner than the other. Would such ferromagnetic debris be magnetized by their orbit within the magnetosphere?
p.s. If yes, I would assume the material that magnetize quicker might attract those that are yet to be magnetized to form a larger mass, and so on ad infinitum. What prevents such an occurence? Is it precluded merely because of the volume of open space and the possible repulsion if the similar poles face each other?