Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature

S. H. Liou; Rui Zhang; Stephen E. Russek; L. Yuan; Sean T. Halloran; David P. Pappas

doi:10.1063/1.2837659

Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature

S. H. Liou, Rui Zhang, Stephen E. Russek, L. Yuan, Sean T. Halloran, David P. Pappas

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34 Scopus citations

Abstract

The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic-ferromagnetic interface. In this study, we investigated the low frequency noise of magnetic tunnel junctions (MTJs) annealed in the temperature range from 265 to 305 °C and magnetic fields up to 7 T, either in helium or hydrogen environments. Our results indicate that the magnetic fluctuators in these MTJs changed their frequency based on annealing field and temperature. The noise of the MTJs at low frequency can be reduced by annealing in high magnetic field (7 T) and further improved by annealing in a hydrogen environment.

Original language	English (US)
Article number	07E920
Journal	Journal of Applied Physics
Volume	103
Issue number	7
DOIs	https://doi.org/10.1063/1.2837659
State	Published - 2008

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature",

abstract = "The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic-ferromagnetic interface. In this study, we investigated the low frequency noise of magnetic tunnel junctions (MTJs) annealed in the temperature range from 265 to 305 °C and magnetic fields up to 7 T, either in helium or hydrogen environments. Our results indicate that the magnetic fluctuators in these MTJs changed their frequency based on annealing field and temperature. The noise of the MTJs at low frequency can be reduced by annealing in high magnetic field (7 T) and further improved by annealing in a hydrogen environment.",

author = "Liou, {S. H.} and Rui Zhang and Russek, {Stephen E.} and L. Yuan and Halloran, {Sean T.} and Pappas, {David P.}",

note = "Funding Information: This research was supported by the SERDP Grant No. MM-1569, NSF MRSEC Award No. DMR-0213808, and ARO DAAD Grant No. 19-03-1-0298.",

year = "2008",

doi = "10.1063/1.2837659",

language = "English (US)",

volume = "103",

journal = "Journal of Applied Physics",

issn = "0021-8979",

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T1 - Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature

AU - Liou, S. H.

AU - Zhang, Rui

AU - Russek, Stephen E.

AU - Yuan, L.

AU - Halloran, Sean T.

AU - Pappas, David P.

N1 - Funding Information: This research was supported by the SERDP Grant No. MM-1569, NSF MRSEC Award No. DMR-0213808, and ARO DAAD Grant No. 19-03-1-0298.

PY - 2008

Y1 - 2008

N2 - The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic-ferromagnetic interface. In this study, we investigated the low frequency noise of magnetic tunnel junctions (MTJs) annealed in the temperature range from 265 to 305 °C and magnetic fields up to 7 T, either in helium or hydrogen environments. Our results indicate that the magnetic fluctuators in these MTJs changed their frequency based on annealing field and temperature. The noise of the MTJs at low frequency can be reduced by annealing in high magnetic field (7 T) and further improved by annealing in a hydrogen environment.

AB - The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic-ferromagnetic interface. In this study, we investigated the low frequency noise of magnetic tunnel junctions (MTJs) annealed in the temperature range from 265 to 305 °C and magnetic fields up to 7 T, either in helium or hydrogen environments. Our results indicate that the magnetic fluctuators in these MTJs changed their frequency based on annealing field and temperature. The noise of the MTJs at low frequency can be reduced by annealing in high magnetic field (7 T) and further improved by annealing in a hydrogen environment.

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Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature

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