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 Sensing a magnetic field with a super conductive material that exhibits magneto resistive properties

Details
Inventors: Katoka, Shoei; Tsuchimoto, Shuhei; Nojima, Hideo; Kita, Ryusuke; Nagata, Masaya;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Edmonds; Warren S.
Attorney, Agent or Firm:

A superconductive magneto-resistive device is made up of superconductive materials having grain boundaries which act as weak couplings. The superconductive material will change from the superconductive state to the normal state when a magnetic field is applied to the material. The superconductive material can be used in various devices for measuring.

DETAILED DESCRIPTION What is claimed is: 1.
A method for sensing a magnetic field which comprises: (a) applying a magnetic field to a superconductive material having grain boundaries, the application of said magnetic field being accompanied with a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (b) sensing said magnetic field by detecting a change in the resistance of said superconductive material which change in resistance is accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
2.
A method for sensing a magnetic field which comprises: (a) applying a magnetic field to a superconductive material having grain boundaries by applying current to said superconductive material having grain boundaries; (b) applying an external magnetic field to said superconductive material having grain boundaries, accompanied with a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (c) sensing said external magnetic field by detecting a change in the resistance of said superconductive material having grain boundaries which is accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
3.
A method for sensing a magnetic field which comprises: (a) supplying a current through a superconductive material having grain boundaries; (b) applying a magnetic field to said superconductive material, said magnetic field causing a phase transition of said superconductive material from a superconductive phase to a normal conductive phase; and (c) detecting a change in the resistance of said superconductive material as an indication of said magnetic field, said change being accompanied with the phase transition of said superconductive material from the superconductive phase to the normal conductive phase.
4.
A superconductive magneto-resistive device comprising: a superconductive material having grain boundaries which act as weak couplings; and means for operatively connecting said superconductive material to use the change in resistance of said superconductive material when a magnetic field is applied to said superconductive material


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