Abstract: Over the past few years, there has been a concerted effort at NIST studying the atomic analogue of a Superconducting Quantum Interference Device (SQUID). The atom-SQUID consists of a Bose-Einstein condensate in a ring trap with a rotating external weak link. The system displays the phenomena of persistent current and hysteresis. In this talk, I will present our results on the the effect of the spin degree of freedom on the stability of persistent-current states and hysteresis in a spin-1 atom-SQUID. Inter-atomic interactions induces coherent oscillations between the spin levels while conserving total magnetisation. We study the stability by calculating the Bogoliubov spectrum of the mean-field solutions of a two-mode approximation and the solutions of Gross-Pitaevskii equation.