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Black holes cannot support their own internal magnetic field like, forexample, compact stars can. Despite this fact observations indicate that eventhorizons of supermassive black holes (SMBH) are threaded by field lines alongwhich plasma streams flow. Various magnetohydrodynamical mechanisms have beensuggested to generate turbulent magnetic fields on small scales, however, theorigin of the large-scale component is unclear. In this write-up we describeour progress in an on-going work and discuss the possibility of dipole-typemagnetic fields being brought onto SMBH by magnetized neutron stars, which areexpected to drift inward from a hidden population in the Nuclear Star Cluster.This can contribute to an organised component of the magnetic field on thecharacteristic length-scale of the stellar size, which thread the horizonduring the final stages of the magnetized star plunge into or its close flybyaround SMBH. Because of mass--size scaling relations for black holes, theeffect is more important for lower-mass SMBH.

Plunging neutron stars as origin of organised magnetic field in galactic nuclei