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Superconductivity: electrical current without resistance. Applications: MRI imagining, magnets. and levitation trains.

A Fresh Spin in Quantum Physics: “spin triplet” supercurrent MRSEC, Johns Hopkins University, DMR05-20491. Superconductivity: electrical current without resistance. Applications: MRI imagining, magnets. and levitation trains. Generally, ferromagnets are detrimental to superconductivity.

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Superconductivity: electrical current without resistance. Applications: MRI imagining, magnets. and levitation trains.

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  1. A Fresh Spin in Quantum Physics: “spin triplet” supercurrent MRSEC, Johns Hopkins University, DMR05-20491 Superconductivity: electrical current without resistance. Applications: MRI imagining, magnets. and levitation trains. Generally, ferromagnets are detrimental to superconductivity. We have created a "spin triplet" supercurrent through a unique ferromagnet, CrO2, a half-metal with 100% spin polarization. Using CrO2, the space between superconductors can be 300 nm apart, instead of 1 nm in conventional ferromagnets. (a), Simplified spin dependent density-of-states (DOS) of CrO2 with a gap for the spin-down DOS, hence no spin-flip scattering in the transport. (b) schematic illustration and (c) scanning electron micrograph of the final device. This finding implies new technologies in the field of "spintronics,” which taps spin as well as charge of electron. The promise: smaller, faster and cost-effective computer memory storage and processing. Spintronic technology already in computer hard drives and magnetic random access memory devices. Spin-based transistors and "quantum computers," are under development for hyperfast calculations. The spin triplet current created with the ferromagnet would allow for new control in spintronics development. R. S. Keizer, S. T. B. Goennenwein, T. M. Klapwijk, G. Miao, G. Xiao, and A. Gupta, “A spin triplet supercurrent through half-metallic ferromagnet CrO2” Nature 439, 825 (2006).

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