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• W2942004619 abstract "Cryogenic preamplification using silicon–germanium heterojunction bipolar transistors has proven to be effective in increasing the signal-to-noise ratio of the tunnel magnetoresistance of high resistance magnetic tunnel junctions at 8 K. The magnetic tunnel junctions used have resistances greater than 1 MΩ, and the cryogenic measurement system still has sufficient bandwidth for the 1/f noise to roll off. A noise model for the system has been proposed and evaluated experimentally. The noise temperature and minimum noise temperature of the transistor used in the experiment are calculated and compared. The signal-to-noise ratio of the junction alone and the transistor-junction system is derived from the sample and circuit parameters and compared. Experimental data show a signal-to-noise ratio increase by a factor of 6.62 after adding in the cryogenic preamplifier. An increase in 1/f noise in the antiparallel state of the tunneling junction as opposed to the parallel state is also observed giving evidence of 1/f noise dependence on the magnetic state of the junction." @default.
• W2942004619 created "2019-05-03" @default.
• W2942004619 creator A5021979144 @default.
• W2942004619 creator A5042685079 @default.
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• W2942004619 date "2019-04-24" @default.
• W2942004619 modified "2023-10-05" @default.
• W2942004619 title "Increasing the signal-to-noise ratio of magnetic tunnel junctions by cryogenic preamplification" @default.
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• W2942004619 doi "https://doi.org/10.1063/1.5059326" @default.
• W2942004619 hasPublicationYear "2019" @default.
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