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A theory of a thermally induced single-electron "shuttling" instability in amagnetic nanomechanical device subject to an external magnetic field ispresented in the Coulomb blockade regime of electron transport. The modelmagnetic shuttle device considered comprises a movable metallic grain suspendedbetween two magnetic leads, which are kept at different temperatures andassumed to be fully spin polarized with antiparallel magnetizations. For agiven temperature difference shuttling is found to occur for a region ofexternal magnetic fields between a lower and an upper critical field strength,which separate the shuttling regime from normal small-amplitude "vibronic"regimes. We find that (i) the upper critical magnetic field saturates to aconstant value in the high temperature limit and that the shuttle instabilitydomain expands with a decrease of the temperature, (ii) the lower criticalmagnetic field depends not only on the temperature independent phenomenologicalfriction coefficient used in the model but also on intrinsic friction (whichvanishes in the high temperature limit) caused by magnetic exchange forces andelectron tunneling between the quantum dot and the leads. The feasibility ofusing thermally driven magnetic shuttle systems to harvest thermal breakdownphenomena is discussed.

Mechanically Induced Thermal Breakdown in Magnetic Shuttle Structures