Tuning emergent magnetism in a Hund's impurity
1038/nnano.2015.193 Abstract: The recently proposed concept of a Hund's metal—a metal in which electron correlations are driven by Hund's rule coupling—can be used to explain the exotic magnetic and electronic [...] materials is, however, experimentally challenging. Here, we show that the basic constituent of a Hund's metal—a Hund's impurity—can be realized using a single iron atom adsorbed on a platinum surface, a system [...] magnetic anisotropy) and probe the magnetic excitations with the microscope tip. The regime of our Hund's impurity can be tuned from an emergent magnetic moment to a multi-orbital Kondo state, and the system