Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions

Yiou Zhang; Guanyang He; Xixiang Zhang; Gang Xiao

doi:10.1063/1.5110715

Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions

Yiou Zhang, Guanyang He, Xixiang Zhang, Gang Xiao

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13 Scopus citations

Abstract

We have investigated the magnetotransport and noise properties of magnetic tunnel junctions incorporating a superparamagnetic free layer, in a wide temperature range from 150 K to 400 K. Both 1/f noise and sensitivity reach the maximum near the blocking temperature of the superparamagnetic transition. The smooth change of noise around the blocking temperature is attributed to size distribution of nanoclusters comprising the free layer. The best detectability (40 nT / H z at 1 Hz) is achieved at 350 K. In ferromagnetic and superparamagnetic states, 1/f noise follows different scaling relations with respect to sensitivity. The change of scaling law is explained by thermodynamics of the nanoclusters.

Original language	English (US)
Pages (from-to)	022402
Journal	Applied Physics Letters
Volume	115
Issue number	2
DOIs	https://doi.org/10.1063/1.5110715
State	Published - Jul 8 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology (KAUST) through the Sensor Initiative.

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10.1063/1.5110715

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title = "Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions",

abstract = "We have investigated the magnetotransport and noise properties of magnetic tunnel junctions incorporating a superparamagnetic free layer, in a wide temperature range from 150 K to 400 K. Both 1/f noise and sensitivity reach the maximum near the blocking temperature of the superparamagnetic transition. The smooth change of noise around the blocking temperature is attributed to size distribution of nanoclusters comprising the free layer. The best detectability (40 nT / H z at 1 Hz) is achieved at 350 K. In ferromagnetic and superparamagnetic states, 1/f noise follows different scaling relations with respect to sensitivity. The change of scaling law is explained by thermodynamics of the nanoclusters.",

author = "Yiou Zhang and Guanyang He and Xixiang Zhang and Gang Xiao",

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AU - Zhang, Yiou

AU - He, Guanyang

AU - Zhang, Xixiang

AU - Xiao, Gang

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PY - 2019/7/8

Y1 - 2019/7/8

N2 - We have investigated the magnetotransport and noise properties of magnetic tunnel junctions incorporating a superparamagnetic free layer, in a wide temperature range from 150 K to 400 K. Both 1/f noise and sensitivity reach the maximum near the blocking temperature of the superparamagnetic transition. The smooth change of noise around the blocking temperature is attributed to size distribution of nanoclusters comprising the free layer. The best detectability (40 nT / H z at 1 Hz) is achieved at 350 K. In ferromagnetic and superparamagnetic states, 1/f noise follows different scaling relations with respect to sensitivity. The change of scaling law is explained by thermodynamics of the nanoclusters.

AB - We have investigated the magnetotransport and noise properties of magnetic tunnel junctions incorporating a superparamagnetic free layer, in a wide temperature range from 150 K to 400 K. Both 1/f noise and sensitivity reach the maximum near the blocking temperature of the superparamagnetic transition. The smooth change of noise around the blocking temperature is attributed to size distribution of nanoclusters comprising the free layer. The best detectability (40 nT / H z at 1 Hz) is achieved at 350 K. In ferromagnetic and superparamagnetic states, 1/f noise follows different scaling relations with respect to sensitivity. The change of scaling law is explained by thermodynamics of the nanoclusters.

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Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions

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