Magneto-optical and magnetic properties in a Co/Pd multilayered thin film

• The results show the effect of a non-zero chemical potential on the magnetization.
• The MOKE and SQUID results show a phase transition point at the same temperature.
• Magnon BEC is a major influence of the observed phase transition temperature.

The paper describes investigation of ferromagnetism at low temperatures. We explored the magneto-optical properties, influenced by photon–magnon interactions, of a ferromagnetic Co/Pd multilayered thin film below and above the magnon Bose–Einstein Condensation (BEC) temperature. Analyses of SQUID and MOKE low temperature experimental results reveal a noticeable phase transition in both magnetic and magneto-optical properties of the material at the BEC temperature.