Device for sensing a magnetic field

Details Device for sensing a magnetic field Device for sensing a magnetic field

2008-03-11

2008-03-11

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S252000

Reexamination Certificate

active

07342396

ABSTRACT:
The device for sensing a magnetic field comprises a closed superconducting pick-up loop (1) having a path width (d) etched out of a single layer superconducting thin film and provided with a constriction (15) having a width (w) of narrow dimension smaller than the path width (d). The closed superconducting pick-up loop (1) constitutes a flux-to-field transformer (FFDT). At least one magnetoresistive element (2) is placed on top of or below the superconducting thin film, is isolated from the superconducting thin film by a thin insulating layer and is located so that an active part of the magnetoresistive element (2) is at the location of the constriction (15) and has a width equal to or less than the width of the constriction (15). The active part of the magnetoresistive element (2) is oriented so that the bias current in this active part is directed essentially along the constriction (15), orthogonally to the width of narrow dimension.

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Cantor, R., et al.: “Low-Noise, Single-Layer YBa2Cu3O7−xDC Squid Magnetometers at 77 K” IEEE Transactions on Applied Superconductivity, vol. 5, No. 2, Jun. 1995, pp. 2927-2930.
Kaiser, G. et al: “First experimental investigations on a thin film Hall magnetometer with a high temperature superconducting pick-up antenna,” CRYOGENICS, vol. 38, No. 6, pp. 625-629, (1998).
Robbes, D. et al: “Highly Sensitive Uncooled Magnetometers:State of the Art. Superconducting Magnetic Hybrid Magnetometers, an alternative to SQUIDs?” IEEE Transactions on Applied Superconductivity, IEEE Inc., New York, US, vol. 11, No. 1, Mar. 2001, pp. 629-634.

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