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The compound SmB$_6$ is the best established realization of a topologicalKondo insulator, in which a topological insulator state is obtained throughKondo coherence. Recent studies have found evidence that the surface of SmB$_6$hosts ferromagnetic domains, creating an intrinsic platform for unidirectionalballistic transport at the domain boundaries. Here, surface-sensitive X-rayabsorption (XAS) and bulk-sensitive resonant inelastic X-ray scattering (RIXS)spectra are measured at the Sm N$_{4,5}$-edge, and used to evaluate electronicsymmetries, excitations and temperature dependence near the surface of cleavedsamples. The XAS data show that the density of large-moment atomic multipletstates on a cleaved surface grows irreversibly over time, to a degree thatlikely exceeds a related change that has recently been observed in the surface4f orbital occupation.

Irreversible proliferation of magnetic moments at cleaved surfaces of the topological Kondo insulator SmB6