Rikagaku Kenkyusho

Mitsui Kinzoku Kogyo Kabushiki Kaisha

Science and Technology Agency

Hiroshi Ohta

Kazutomo Hoshino

Hidefusa Takahara

Masakazu Aono

Kazuhiko Kato

Tomonobu Nakayama

Eiichi Sudoh

Eiichi Goto

This invention provides a superconducting magnetic shield and a magnetic shielding apparatus including the same, thereby accurately measuring an extremely weak magnetic field such an magnetoencephalographic waves by reducing the influence of magnetic field of the earth or magnetic noises.

Superconducting magnetic shield

This invention provides a superconducting magnetic shield and a magnetic shielding apparatus including the same, thereby accurately measuring an extremely weak magnetic field such as magnetoencephalographic waves by reducing the influence of magnetic field of the earth or magnetic noises.

A fluxoid type superconducting logic element essentially comprises a single main superconductor loop and a switching element connected across the main superconductor loop. When the switching element is open, a permanent current flows in the main superconductor loop of the logic element at a cryogenic temperature, thereby sustaining a half-odd integer multiple of magnetic flux unit in each half of said main loop. When a small amount of input magnetic flux is applied to one half of the main loop and the switch is closed, the distribution of the magnetic flux varies according to the quantum theory to allow an integer multiple of magnetic flux to occupy each separated domain of the main loop. These two different magnetic flux distributions can be used to represent a binary state.

Fluxoid type superconducting logic element

A Josephson junction element which comprises a substrate, a first strip-like superconductor thin film layer arranged on said substrate, a second strip-like superconductor thin film layer arranged on said first superconductor layer in crossing relation thereto, an insulator layer disposed between said first and second superconductor layer at the crossing area and a weak link portion connecting said first and second layer together across the sides of the thickness of said insulator layer. A method for manufacturing such Josephson junction element.

Josephson junction element and method of making the same

Disclosed is an improved Josephson junction comprising a superconductor-separator-superconductor laminar deposition on a substrate, the overlying and underlying superconductor layers being laid offset to each other, and a weak link extending from one of the superconductor layers to the other across the thickness of the intervenient separator. A triple layer superconducting device according to this invention has as short barrier length and as low capacitance as possible, and is characteristic of a large product of junction resistance and critical current. Also, the geometrical configuration of the device is most appropriate for the purpose of massproduction.

Method of making a Josephson junction

Disclosed is an improved Josephson junction comprising a superconductor-separator-superconductor laminar depositions on a substrate, the overlying and underlying superconductor layers being laid offset to each other, and a weak link extending from one of the superconductor layers to the other across the thickness of the intervenient separator. A triple layer superconducting device according to this invention has as short barrier length and as low capacitance as possible, and is characteristic of a large product of junction resistance and critical current. Also, the geometrical configuration of the device is most appropriate for the purpose of massproduction.

Growing community of inventors

Wako, Japan

Hiroshi Ohta