A composite magnetosuperconducting switch is proposed. The device, which is based on Andreev reflection at the superconductor/ferromagnet contact, combines high efficiency with nonvolatility. The low-impedance state of the device corresponds to the normal state of the superconductor, whereas the high-impedance state corresponds to the superconducting state. The proposed device does not require high-quality Andreev contacts; on the contrary, interface scattering significantly increases the efficiency of the device. Up to 1000%–2500% efficiency can be achieved with the existing ferromagnetic materials. The device can be used as a basic element for nonvolatile logic and memory.

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