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A model of superconducting computer memory exploiting the orthogonal spintransfer (OST) in the pseudospin valve (PS) that is controlled by thethree-terminal Josephson superconducting-ferromagnetic transistor (SFT) isdeveloped. The building blocks of the memory are hybrid PS and SFT structures.The memory model is formulated in terms of the equation-defined PS and SFTdevices integrated into the PS/SFT memory cell (MC) circuit. Logical units "0"and "1" are associated with the two PS states respectively characterized by twodifferent values of resistance. Elementary logical operations comprising theread/write processes occur when a word pulse applied to the SFT's injectorcoincides with the respective bit pulse acting on MC. Physically, a word pulsetriggers SFT to a resistive state, causing the PS switching between the logical"0" and "1" states. Thus, the whole switching dynamics of MC depends on thenon-equilibrium and nonstationary properties of PS and SFT. Modeling the singleMC as well as the larger MC-based circuits comprising respectively twelve andthirty elements suggest that such the memory cells can undergo ultrafastswitching (sub-ns) and low energy consumption per operation (sub-100 fJ). Thesuggested model allows studying the influence of noises, punch-through effect,crosstalk, parasitic, etc. The obtained results suggest that the hybrid PS/SFTstructures are well-suited to superconducting computing circuits as they arebuilt of magnetic and non-magnetic transition metals and therefore have lowimpedances (1-30 Ohm).

Modeling the computer memory based on the ferromagnet/superconductor multilayers