Topological photonic crystals have emerged as a powerful platform for achieving robust light transport, even in the presence of disorder. In this work, we theoretically investigate the formation of topological interface states (TIS) in a magnetized plasma-based topological photonic crystal (MPTPC). The interface state arises at the boundary between two magnetized plasma photonic crystals with distinct topological phases. We analyze the impact of three key physical parameters: magnetic field strength \(\varvec{B_{ext}}\) , electron density ( \(\varvec{n_e}\) ), and loss factor ( \(\gamma\) ) on the transmittance spectra and localization properties of the TIS. Our results reveal that \(\varvec{B_{ext}}\) and \(\varvec{n_e}\) significantly influence the spectral position and width of the interface mode in opposing ways: increasing \(|\varvec{B_{ext}}|\) leads to a blueshift and broadening, while increasing \(\varvec{n_e}\) results in a redshift and narrowing of the mode. In contrast, variations in the loss factor \(\gamma\) within the studied range have a negligible effect on the TIS. These findings highlight the need for a careful balance between \(|\varvec{B_{ext}}|\) and \(\varvec{n_e}\) to optimize the quality and stability of the interface mode. The tunability of the TIS in MPTPCs opens new avenues for designing reconfigurable and robust photonic devices.
