  Developing materials that can lead to compact versions of artificial neurons
(neuristors) and synapses (memristors) is the main aspiration of the nascent
neuromorphic materials research field. Oscillating circuits are interesting as
neuristors, emulating the firing of action potentials. We present
room-temperature self-oscillating devices fabricated from epitaxial thin films
of semiconducting TbMnO3. We show that these electrical oscillations induce
concomitant mechanical oscillations that produce audible sound waves, offering
an additional degree of freedom to interface with other devices. The intrinsic
nature of the mechanism governing the oscillations gives rise to a high degree
of control and repeatability. Obtaining such properties in an epitaxial
perovskite oxide, opens the way towards combining self-oscillating properties
with those of other piezoelectric, ferroelectric, or magnetic perovskite oxides
to achieve hybrid neuristor-memristor functionality in compact heterostuctures.
