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Tohoku University Technology: Random number generation unit and computing system: T19-076

Comparable computing ability with quantum annealing at room temperature

Quantum annealing has been intensively investigated recent years. However, it requires a superconductivity condition (at extreme low temperature), and complicate system like quantum bit connection. Meanwhile, magnetic tunnel junction (MTJ), a solid-state component gives probability output in MRAM, has been noticed among those research. This invention applies MTJ’s property and successfully provides a probability information processing computer system, which is comparable with quantum annealing’s computing ability but much simpler to use.

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Tohoku University Technology: Giant Magnetoresistance Magnetic Tunnel Junction Device: T21-109

Improved stability of operation against external magnetic fields.

In recent years, magnetic tunnel junctions (MTJs) have attracted attention as solid-state devices capable of generating random output signals, with applications expected in random number generation units for probabilistic computing systems. However, superparamagnetic MTJs, designed to have a magnetic direction in the free layer that is easily disturbed by thermal fluctuations, are sensitive to external magnetic fields due to their small anisotropic magnetic field, making them susceptible to external magnetic influences even from fields of a few mT. The present invention is a technology that offers excellent operational stability (robustness) against external magnetic fields, suitable for superparamagnetic MTJs, and supports the social implementation of computing systems using them.

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