Restriction of vortex motion in superconducting NbN film via ion irradiation

Tracking the vortex motion plays an important role in improving the performance of superconducting materials and devices. The method of ion irradiation is usually adopted to hinder the vortex motions in the type-II superconductors by generating vortex pinning centers. In this work, we report the transport study on magnetic and electric properties of Niobium-Nitride (NbN) by the influence of ion irradiations on the vortex motion. By applying various values of ion irradiations, i.e., 3.75 MeV-Kr15+, 15 keV-N1+, and 300 keV-H1+; a reduction of 75