Thermal stability characterization of magnetic tunnel junctions using hard-axis magnetoresistance measurements

Pramey Upadhyaya; Pedram Khalili Amiri; Alexey A. Kovalev; Yaroslav Tserkovnyak; Graham Rowlands; Zhongming Zeng; Ilya Krivorotov; Hongwen Jiang; Kang L. Wang

doi:10.1063/1.3548830

Thermal stability characterization of magnetic tunnel junctions using hard-axis magnetoresistance measurements

Pramey Upadhyaya^*, Pedram Khalili Amiri, Alexey A. Kovalev, Yaroslav Tserkovnyak, Graham Rowlands, Zhongming Zeng, Ilya Krivorotov, Hongwen Jiang, Kang L. Wang

^*Corresponding author for this work

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The use of hard-axis magnetoresistance (MR) measurements for characterization of the device-level anisotropy field and thermal stability in CoFeB/MgO/CoFeB magnetic tunnel junctions is proposed and evaluated. We develop functional forms describing the hard-axis MR curves using a Stoner-Wohlfarth particle model, which are then used for fitting to the experimental curves to extract the free layer magnetic anisotropy field. The model accounts for nonidealities observed in the experimental MR curves in the form of asymmetry (with respect to applied fields), and linear drop in resistance at high fields. Micromagnetic simulations are used to identify the cause for these deviations and verify the presented model.

Original language	English (US)
Article number	07C708
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3548830
State	Published - Apr 1 2011

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Thermal stability characterization of magnetic tunnel junctions using hard-axis magnetoresistance measurements",

abstract = "The use of hard-axis magnetoresistance (MR) measurements for characterization of the device-level anisotropy field and thermal stability in CoFeB/MgO/CoFeB magnetic tunnel junctions is proposed and evaluated. We develop functional forms describing the hard-axis MR curves using a Stoner-Wohlfarth particle model, which are then used for fitting to the experimental curves to extract the free layer magnetic anisotropy field. The model accounts for nonidealities observed in the experimental MR curves in the form of asymmetry (with respect to applied fields), and linear drop in resistance at high fields. Micromagnetic simulations are used to identify the cause for these deviations and verify the presented model.",

author = "Pramey Upadhyaya and Amiri, {Pedram Khalili} and Kovalev, {Alexey A.} and Yaroslav Tserkovnyak and Graham Rowlands and Zhongming Zeng and Ilya Krivorotov and Hongwen Jiang and Wang, {Kang L.}",

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T1 - Thermal stability characterization of magnetic tunnel junctions using hard-axis magnetoresistance measurements

AU - Upadhyaya, Pramey

AU - Amiri, Pedram Khalili

AU - Kovalev, Alexey A.

AU - Tserkovnyak, Yaroslav

AU - Rowlands, Graham

AU - Zeng, Zhongming

AU - Krivorotov, Ilya

AU - Jiang, Hongwen

AU - Wang, Kang L.

PY - 2011/4/1

Y1 - 2011/4/1

N2 - The use of hard-axis magnetoresistance (MR) measurements for characterization of the device-level anisotropy field and thermal stability in CoFeB/MgO/CoFeB magnetic tunnel junctions is proposed and evaluated. We develop functional forms describing the hard-axis MR curves using a Stoner-Wohlfarth particle model, which are then used for fitting to the experimental curves to extract the free layer magnetic anisotropy field. The model accounts for nonidealities observed in the experimental MR curves in the form of asymmetry (with respect to applied fields), and linear drop in resistance at high fields. Micromagnetic simulations are used to identify the cause for these deviations and verify the presented model.

AB - The use of hard-axis magnetoresistance (MR) measurements for characterization of the device-level anisotropy field and thermal stability in CoFeB/MgO/CoFeB magnetic tunnel junctions is proposed and evaluated. We develop functional forms describing the hard-axis MR curves using a Stoner-Wohlfarth particle model, which are then used for fitting to the experimental curves to extract the free layer magnetic anisotropy field. The model accounts for nonidealities observed in the experimental MR curves in the form of asymmetry (with respect to applied fields), and linear drop in resistance at high fields. Micromagnetic simulations are used to identify the cause for these deviations and verify the presented model.

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Thermal stability characterization of magnetic tunnel junctions using hard-axis magnetoresistance measurements

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