The present invention relates to a magnetic device (400a) that can be localized and moved by a magnetic particle imaging apparatus, said magnetic device comprising a force-receiving portion (410a) formed by one or more ferromagnetic force-receiving elements, which force-receiving portion can be moved and/or oriented by use of magnetic fields, and a localization portion (420a) formed by one or more soft-magnetic localization elements arranged within or at a predetermined distance from said force-receiving portion, which localization portion provides response signals in response to the movement of a substantially field free area of a magnetic field over the location of the localization portion.
