Method of controlling a super conductor

Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Tunneling through region of reduced conductivity

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505190, 505310, 505329, 505726, 505842, H01L 2906, H01L 3922

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active

058723684

ABSTRACT:
The order parameter of a superconductor is reduced by injecting spin-polarized carriers into the superconductor. The reduction in the order parameter is used to modulate the critical current of the superconductor. In a typical embodiment, a current is caused to flow through a superconductor. Spin polarized electrons are then injected into the path of the current in the superconductor by biasing a magnetic metal with respect to a terminal of the superconductor. The bias current may be varied to modulate the injection and thus the flow of current through the superconductor.

REFERENCES:
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Vas'ko et al., "Critical Current Suppression in a Superconductor bu Injection of Spin-Polarized Carriers from a Ferromagnet", Physical Review Letters, vol. 78, No. 6, pp. 1134-1137, Feb. 2, 1997.
Tedrow et al., "Spin Polarization of Electrons Tunneling from Films of Fe, Co, Ni, and Gd", Physical Review B, vol. 7, No. 1, pp. 318-326, Jan. 1, 1973.
Dessau, Daniel S., Colossal Magnetoresistive Oxides, Abstract-SRC-Workshop 97.
"Transport Properties of YBazCu.sub.3 O7-.delta./Ferromagnetic Interfaces", Haas et al., Physica C, 235-240 (1994) pp. 1905-1906.
"Quasiparticle-Injection-Induced Superconducting Weak Links," Wong et al., Phys. Rev. Let., vol. 37, No. 3, 19 Jul. 1976, pp. 150-153.
"High-Tc Transistor", Manhart, J., preprint, Superconductor Science and Technology (Jul. 28, 1995).
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"Spin Coupled Resistance Observed in Ferromagnet-Superconductor-Ferromagnet Trilayers", Johnson, M., Applied Phys. Lett. 65, vol. No. 11 Sep. 12, 1994, pp. 1460-1462.

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