Sumitomo Electric Industries, Limited

Agency of Industrial Science and Technology

Hideo Itozaki

Shuji Yazu

Saburo Tanaka

Tetsuji Jodai

Nobuhiko Fujita

Keizo Harada

Kenjiro Higaki

Tatsuoki Nagaishi

Takashi Matsuura

Naoji Fujimori

Hidenori Nakanishi

Hisao Hattori

Hirokazu Kugai

Akihiro Moto

Takeshi Yamaguchi

Tadakazu Kobayashi

Nozomu Kawabe

Haruhisa Toyoda

Hajime Hitotsuyanagi

Tetsuya Hirano

Takahiro Imai

Noriyuki Yoshida

Kazuo Sawada

Satoshi Takano

Tomoyuki Awazu

Teruyuki Murai

Yoshinobu Takeda

Susumu Yamamoto

Shinichi Shikata

Noriki Hayashi

Kenji Miyazaki

Hitoshi Oyama

Takashi Uemura

Takeshi Kobayashi

Kouichi Sogabe

Kenichiro Sibata

Nobuyuki Sasaki

Akira Nakayama

Syoji Nakagama

Hiromu Kawai

Yasuyuki Matsui

Kengo Okura

Shousaku Yamanaka

Kazuhiko Fukushima

Sigeki Isojima

Kazuhiko Hayasi

According to this invention, a magnetic sensor ( ) for measuring a magnetic field distribution of a measurement target S by using a SQUID ( ) is characterized by including a storing portion ( ) with an interior held in a vacuum state to store the SQUID ( ), and a substantially needle-like flux introducing member ( ) made of a high-permeability material to guide a magnetic flux from the measurement target (S) to the SQUID ( ), wherein the flux introducing member ( ) has one end ( ) located in the storing portion ( ) to be away from the SQUID ( ) and the other end ( ) located outside the storing portion ( ).

Superconducting magnetic sensor having a cryostet with a flux guide

A SQUID bias current adjustment device supplies a sinusoidal current at 40 kHz, for example, to a coil to generate magnetic field at a SQUID. The amplitude of the field corresponds to a half period of a field-voltage characteristic. Voltage generated from the SQUID at this time is filtered by using a filter to pick out components of 40 kHz and 80 kHz. The picked out signal components are rectified and converted to direct current, and the bias current is adjusted such that the maximum value is obtained. In this way, a SQUID bias current adjustment device can be provided capable of automatically adjusting bias current properly in a short period of time.

Device and method for easily adjusting working point of SQUID

A modulation current at a predetermined frequency f is applied from an AC source to a flux locked loop for maintaining magnetic flux supplied to a SQUID at a constant value. An output voltage is picked out from the SQUID in this state to which a predetermined bias current is being applied from a current and field bias application circuit, and the picked out voltage passed through a filter and a rectifier is monitored by a voltage monitor. The filter picks out a frequency component of 80 kHz which is twice as high as the frequency component f, 40 kHz, applied from the AC source, and maximizes it. In this way, a method and a device for easily adjusting magnetic field bias in a modulation drive circuit for a SQUID can be provided.

Magnetic field bias adjusting device for SQUID modulation drive circuit achieving easy adjustment

A superconducting thin film pattern ( ) formed from an oxide superconducting thin film is formed on a sapphire substrate ( ) having a step ( ) via a CeO buffer layer, and the step ( ) and superconducting thin film pattern ( ) are formed such that the step ( ) crosses a predetermined portion of a square thin film pattern ( ) having an opening portion ( ) at the central portion. Step-edge Josephson junctions ( ) are formed at the portion crossed by the step ( ), and a SQUID is obtained. The sapphire substrate is relatively inexpensive, and a large substrate can be used.

Squid

A magnetic field sensor has a SQUID, which is made of thin film of oxide superconductor deposited on a substrate, and a magnetic flux guide that has a higher permeability than vacuum to increase the effective capture area. The flux guide is positioned and aligned over a hole that is surrounded with superconducting current loop formed in a washer thereof. The SQUID also has a pair of Josephson junction formed on the washer and a pair of opposite terminals for connecting the washer to an outer circuit. In the SQUID, a variation in magnetic flux passing through the hole is detected in a form of variation in output voltage.

Magnetic field sensor having a flux guide to increase the effective capture area

A hydrogen storage laminated material can be obtained which is capable of achieving reduction in weight as well as being mass-produced industrially while assuring excellent hydrogen storage capability. The hydrogen storage laminated material ( ) has a laminated structure of a first layer ( ) and a second layer ( ), wherein the first layer is formed from an alloy or compound including an element of a group A or A or an element of at least one of the groups A and A, and at least partially includes a bcc structure, and the second layer is formed from an alloy or compound including an element of one of groups A, A and A or an element of at least one of the groups A, A and A.

Hydrogen-occluding layered material

In the apparatus for cooling a superconductor in accordance with the present invention, a male thread portion of an inner container engages a female thread portion of an outer container so as to connect the inner and outer containers to each other. Also, the bottom wall of the inner container is provided with a thermal conductor penetrating therethrough. Further, a sapphire sheet is joined to peripheral portions of an opening of the bottom wall of the outer container facing the thermal conductor, so as to block the opening. As the distance between the bottom wall of the outer container and the bottom wall of the inner container is freely adjusted by changing the engaging position between the thread portions, the gap between a high transition temperature (high T ) superconducting magnetic sensor and the sapphire sheet is adjusted.

Apparatus for cooling superconductor

This magnetic sensor comprises a flux transformer,having a superconducting thin film,formed on a sapphire substrate,, and a SQUID,disposed on the flux transformer,opposite thereto. In this magnetic sensor, since the sapphire substrate,, which can be obtained in a large size, is used for the flux transformer,, even when the SQUID,is made smaller, the magnetic flux introduced from the flux transformer,into the SQUID,can be enhanced so as to increase the effective magnetic flux capturing area, whereby the detecting performance is improved, while the manufacturing cost can be reduced due to the smaller size of the SQUID

Magnetic sensor with squid and having superconducting coils formed on sapphire substrate

The present invention relates to a detecting apparatus for detecting a magnetic minute substance. The detecting apparatus of the present invention can detect continually at a high sensitivity an entity of fine particle, without destroying an object to be inspected. The detecting apparatus comprises a magnetic field generator and a magnetic sensor. The magnetic field generator generates a magnetic field having a right angle to the traveling direction of the object to be inspected. The magnetic sensor includes a SQUID for inspecting a drift of the magnetic field that is parallel to the magnetic field.

Detecting equipment for detecting magnetic minute substance in an object

A substrate for a superconducting microwave component is composed of a pair of oxide superconductor thin films formed on opposite surfaces of a dielectric substrate, respectively. After Tl-type oxide superconducting thin films are deposited the opposite surfaces of the dielectric substrate, respectively, am annealing is performed in a thallium atmosphere.

Method of manufacturing superconducting microwave component substrate

A tunnel junction type Josephson device includes a pair of superconductor layers formed of a compound oxide superconductor material and an insulator layer formed between the pair of superconductor layers. The insulator layer is formed of a compound oxide which is composed of the same constituent elements as those of the compound oxide superconductor material of the superconductor layers but with an atomic ratio which does not present a superconductivity characteristics. In addition, the superconductor layers and the insulator layer are continuously formed while supplying oxygen.

Tunnel junction type josephson device

A high-temperature superconducting thin film of compound oxide selected from the group consisting of:

Superconducting thin film and a method for preparing the same

Method and apparatus for determining concentration of a trace of contaminant magnetic substances contained in a non-magnetic substance. A magnetic field (3) is applied to the non-magnetic substance (1) from outside a duct (2) through which the non-magnetic substance is advanced so that magnetic substances contained in the non-magnetic substance are magnetized. At a downstream in the duct, an intensity of magnetic field produced substantially only by the magnetized magnetic substance is detected by a magnetic sensor (8) having a superconducting quantum interference device (SQUID).

Method and apparatus for determining concentration of magnetic

The present invention provides an improved and simplified voltage step-up circuit (2) for a SQUID magnetometric sensor (1), which provides step-up of a voltage signal generated by a SQUID element (11). The SQUID element is exited by a modulated signal using the FLL method. In an example, a step-up means (22) comprises only one step-up transformer (22T) working at room temperature and an electronic amplifier (22A). The voltage signal is first stepped up by the transformer. A signal processing means (23) processes the stepped up signal with the modulation signal to output a magnetic field measurement signal (V.phi.). In another example, a bias current source (21) is also connected to terminals between SQUID element (11) and the transformer (22). A series resistor is connected between the transformer and one of the terminals. This allows a reduction in the number of terminals between the SQUID sensor (1) and the circuit (2).

Magnetometric sensor using a voltage step up circuit and a SQUID element

The method for forming superconducting films of complex oxide compounds in a process chamber according to the present invention includes the steps of: (a) placing a substrate near a target in a chamber so that the substrate is positioned to be generally perpendicular to a surface of the target, the target comprising a target material of complex oxide compounds; and (b) irradiating a laser beam to the surface of the target to vaporize or sublime the target material forming over the target a flame-shaped plume having on axis generally perpendicular to the surface of the target so that the target material is deposited onto a surface of the substrate, the surface of the substrate maintaining the position to be generally perpendicular to the surface of the target and being generally parallel to the axis of the plume, wherein the target rotates on an axis perpendicular to the surface of the target and the substrate rotates on an axis perpendicular to the surface of the substrate (off-axis geometry), and wherein the laser beam scans the surface of the target. The chamber pressure P.sub.c for the off-axis geometry laser ablation should be 0.8 Torr.ltoreq.P.sub.C.ltoreq. 1.5 Torr for Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x film.

Method and apparatus for depositing superconducting layer onto the

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Hyogo, Japan

Hideo Itozaki