Magneto-optical Phase Transition in a Nanostructured Co/Pd Thin Film*

Interest in the study of magnetism in nanostructures at low temperatures is growing. We report work that extends the magnetics experiments in [1] that studied Bose-Einstein Condensation (BEC) of magnons in confined nanostructures. We report experimental investigation of the magneto-optical properties, influenced by photon-magnon interactions, of a Co/Pd thin film below and above the magnon BEC temperature. Comparison of results from SQUID and MOKE experiments revealed a phase transition temperature in both magnetic and magneto-optical properties of the material that is attributed to the magnon BEC. Recent research in magnonics has provided a realization scheme for developing magnon BEC qubit gates for a quantum computing processor [2]. Future research work will explore this technology and find ways to apply quantum computing to address some computational challenges in communication systems. [1] Bennett L. H. and Della Torre, E. (2014) J. Mod. Phys. 5, 693. [2] Andrianov S. N. and Moiseev, S. A. (2014) Phys. Rev. A 90,042303.