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Nanomagnets with giant magnetic anisotropy energy and long coherence time aredesired for various technological innovations such as quantum informationprocession and storage. Based on the first-principles calculations and modelanalyses, we demonstrate that a single uranium atom substituting Al on theAl2O3(0001) surface may have high structural stability and large magneticanisotropy energy up to 48 meV per uranium atom. As the magnetization residesin the localized f-shell and is not much involved in chemical bonding withneighbors, long coherence time up to ~1.6 mS can be achieved for the quantumspin states. These results suggest a new strategy for the search of ultrasmallmagnetic units for diverse applications in the quantum information era.

Giant magnetic anisotropy energy and long coherence time of uranium substitution on defected Al2O3(0001)