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The mechanisms governing mechanical dissipation in amorphous tantala arestudied at microscopic scale via Molecular Dynamics simulations, namely bymechanical spectroscopy in a wide range of temperature and frequency. We findthat dissipation is associated with irreversible atomic rearrangements with asharp cooperative character, involving tens to hundreds of atoms arranged inspatially extended clusters of polyhedra. Remarkably, at low temperature weobserve an excess of plastically rearranging oxygen atoms which correlates withthe experimental peak in the macroscopic mechanical losses. A detailedstructural analysis reveals preferential connections of the irreversiblyrearranging polyhedra, corresponding to edge and face sharing. These resultsmight lead to microscopically informed design rules for reducing mechanicallosses in relevant materials for structural, optical, and sensing applications.

Non-local cooperative atomic motions that govern dissipation in amorphous tantala unveiled by dynamical mechanical spectroscopy