Nonvolatile State Configuration of Nano-Watt Parametric ISING Spins Through Ferroelectric Hafnium Zirconium Oxide MEMS Varactors
2023 IEEE 36th International Conference on Micro Electro Mechanical Systems (MEMS)(2023)
摘要
This work reports on an Ising system formed by two artificial spins and relying, for the first time, on a ferroelectric MEMS device to permanently configure the spins’ interactions to ferromagnetic or anti-ferromagnetic. These spins, consisting of two parametric oscillators (POs) built from off-the-shelf components, are driven by the same 2MHz ("pump") signal and are coupled through a series LC-network with resonance frequency (f
C
) formed by two inductors and a microfabricated hafnium zirconium oxide (HZO) MEMS varactor. We show that leveraging the nonvolatile ferroelectric memory characteristic of the HZO varactor allows a shift of f
C
to a lower or to a higher value than ~1MHz based on HZO polarization state, triggering nonvolatile ferromagnetic or anti-ferromagnetic interactions without consuming power for the spin-coupling during the system operation. These features, together with the exceptionally low power threshold of the POs, makes the reported Ising system consume the least power-per-spin (~600nW) reported to date.
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关键词
MEMS, Ising Machines, Parametric Oscillators, Ferroelectric Devices, Ferromagnetic Spins
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