Increasing the signal-to-noise ratio of magnetic tunnel junctions by cryogenic preamplification
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. Additionally, an increase in 1/f noise in the antiparallel state of the tunneling junction as opposed to the parallel state is observed giving evidence of 1/f noise dependence on the magnetic state of the junction.
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Publication Date:
- Research Org.:
- Georgia Institute of Technology, Atlanta, GA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1609717
- Alternate Identifier(s):
- OSTI ID: 1508673; OSTI ID: 1666138
- Grant/Contract Number:
- FG02-06ER46281; NA0003525; FG0206ER46281; NA-0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 125; Journal Issue: 16; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Physics; Parasitic capacitance; Transistors; Thin films; Amplifiers; Magnetism; Magnetic tunnel junctions; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Spin Electronics; Cryogenic Preamplification
Citation Formats
Dark, J., Ying, H., Nunn, G., Cressler, J. D., and Davidović, D. Increasing the signal-to-noise ratio of magnetic tunnel junctions by cryogenic preamplification. United States: N. p., 2019.
Web. doi:10.1063/1.5059326.
Dark, J., Ying, H., Nunn, G., Cressler, J. D., & Davidović, D. Increasing the signal-to-noise ratio of magnetic tunnel junctions by cryogenic preamplification. United States. https://doi.org/10.1063/1.5059326
Dark, J., Ying, H., Nunn, G., Cressler, J. D., and Davidović, D. Wed .
"Increasing the signal-to-noise ratio of magnetic tunnel junctions by cryogenic preamplification". United States. https://doi.org/10.1063/1.5059326. https://www.osti.gov/servlets/purl/1609717.
@article{osti_1609717,
title = {Increasing the signal-to-noise ratio of magnetic tunnel junctions by cryogenic preamplification},
author = {Dark, J. and Ying, H. and Nunn, G. and Cressler, J. D. and Davidović, D.},
abstractNote = {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. Additionally, an increase in 1/f noise in the antiparallel state of the tunneling junction as opposed to the parallel state is observed giving evidence of 1/f noise dependence on the magnetic state of the junction.},
doi = {10.1063/1.5059326},
journal = {Journal of Applied Physics},
number = 16,
volume = 125,
place = {United States},
year = {Wed Apr 24 00:00:00 EDT 2019},
month = {Wed Apr 24 00:00:00 EDT 2019}
}
Web of Science
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