CERAMIC SUPERCONDUCTIVE MEMORY ELEMENT

• Main Authors: TSUCHIMOTO SHUHEI, NOJIMA HIDEO, HASHIZUME NOBURO, KATAOKA TERUE, MORISUE MICHITADA
• Format: Patent
• Language: English
• Published: 21.12.1989
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CONDUCTORS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INFORMATION STORAGE; INSULATORS; PHYSICS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; SEMICONDUCTOR DEVICES; STATIC STORES

PURPOSE:To make a control energy small so as to enable the write-in and readout at a high speed by a method wherein a superconductive loop formed of a ceramic superconductor that has granules which are partially very susceptible to the effect of a magnetic field and a control conductor wire near to the loop are provided. CONSTITUTION:When a current of 4mA is made to flow through a superconductor wire section through the intermediary of electrode terminals a-b under a such a condition that it is cooled at a liquid nitrogen temperature, a current of 2mA half the current of 4mA flows through wires 1 and 2 respectively. Next, when a current of 10mA is made to flow through a conductor wire 3, a magnetic field of 0.4 gauss or so is applied onto the ceramic superconductor wire 1 separate from the wire 3 by a space of 50mum, which is brought into a normal conductive state and becomes electrically resistive, so that a current flows only through the superconductor wire 2. In this state, when a power source connected between the conductor wire 3 and the electrode terminals a-b of the superconductor wires is turned off, a permanent current of 4mA or so flows through a superconductive wire loop, so that a memory element retaining a magnetic flux inside the superconductive wire loop is brought into a write-in state.