Functional Switching in Quantum-Flux-Parametron with Ferromagnetic Patterns

Ito Hiroshi, Taniguchi Soya, Kurokawa Sota, Tanaka Masamitsu, Akaike Hiroyuki, Fujimaki Akira

doi:10.1541/ieejfms.136.753

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Other Title

強磁性パターンを用いた磁束量子パラメトロンの論理機能切り替え
キョウジセイパターンオモチイタジソクリョウシパラメトロンノロンリキノウキリカエ

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Description

<p>Functional switching has been demonstrated based on quantum flux parametron (QFP) circuits with ferromagnetic patterns toward reconfigurable circuits. We form small ferromagnetic patterns of a PdNi alloy on a superconducting loop without degradation of superconductivity. Direction and strength of magnetization of ferromagnetic patterns are controlled by direction and magnitude of an applied magnetic field in a cooling process around the Currie points of the alloy. The ferromagnetic patterns induce a circulating current serving as one of the input currents in a three-inputs QFP majority gate. We obtained functional switching between the AND to the OR operation depending on the direction and strength of magnetization of the ferromagnetic patterns experimentally. The obtained operation margin agreed with a numerically obtained margin, though the magnitude of magnetization at the switching between two operation modes was different. This technique add new functionality and flexibility to the QFP-based integrated circuits.</p>

Journal

IEEJ Transactions on Fundamentals and Materials

IEEJ Transactions on Fundamentals and Materials 136 (12), 753-758, 2016

The Institute of Electrical Engineers of Japan

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