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Pure Spin Current in a Non-Equilibrium Magnetic Insulator

  • Non-equilibrium systems are found everywhere in nature and provide an array of interesting phenomena that are also essential for current- or heat-driven devices.
  • We investigate spin current in a magnetic insulator, YIG, under thermally driven  non-equilibrium conditions, a challenging task for conventional transport techniques
  • Brillouin light scattering (BLS) is used to probe local phonon and magnon temperature and to map local magnon population
  • Theoretically, we expand to the concept of magnon chemical potential to describe spin current in an non-equilibrium system
  • We experimentally evaluate two mechanisms that drive spin current  in a magnetic insulator, temperature and magnon chemical potential gradient.