Spin transport phenomena at strongly correlated interfaces play central roles in fundamental physics as well as spintronic applications. To anatomize spin-transport carriers, we propose the detection of the spin-current noise in interacting itinerant fermions. The Fano factor given by the ratio between the spin current and its noise reflects elementary carriers of spin transport at the interface of spin-polarized Fermi gases realized in ultracold atoms. The change of the Fano factor microscopically evinces a crossover from quasiparticle transport to magnon transport in itinerant fermionic systems.

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• Fermi gases
• Ferromagnetism
• Magnons
• Quantum transport
• Shot noise
• Spintronics
• Strongly correlated systems
• Nonequilibrium Green's function