Spin-torque driven switching probability density function asymmetry

Hui Zhao; Yisong Zhang; Pedram Khalili Amiri; Jordan A. Katine; Juergen Langer; Hongwen Jiang; Ilya N. Krivorotov; Kang L. Wang; Jian Ping Wang

doi:10.1109/TMAG.2012.2197815

Spin-torque driven switching probability density function asymmetry

Hui Zhao, Yisong Zhang, Pedram Khalili Amiri, Jordan A. Katine, Juergen Langer, Hongwen Jiang, Ilya N. Krivorotov, Kang L. Wang, Jian Ping Wang

Electrical and Computer Engineering

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

21 Scopus citations

Abstract

We studied the spin transfer torque (STT) driven switching voltage distribution systematically by characterizing the switching probability density function (PDF) with large statistics (10 ⁵ trials) across a wide time scale from 5 ns to 1 μs. The skew normal distribution function is found to be a good one to fit the measured switching PDF down to low values, which would be used as a guideline to extrapolate read disturb rate (RDR) and write error rate (WER) in STT-RAM design. Moreover, the asymmetry of switching probability density function is observed to flip when the pulse width decreases. It is related to the fluctuation mechanism transition from the thermal agitation to the initial magnetization trajectory dispersion.

Original language	English (US)
Article number	6332615
Pages (from-to)	3818-3820
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	48
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2012.2197815
State	Published - 2012

Bibliographical note

Funding Information:
This work was supported in part by the DARPA STT-RAM program (Grant No. HR0011-09-C-0114) and NSF MRSEC Program at University of Minnesota (Grants No. DMR-0819885). The work of J.-P. Wang, H. Zhao, and Y. Zhang was supported in part by an Intel University Research Grant.

Keywords

Magnetic tunnel junction
STT-RAM
spin transfer torque switching

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title = "Spin-torque driven switching probability density function asymmetry",

abstract = "We studied the spin transfer torque (STT) driven switching voltage distribution systematically by characterizing the switching probability density function (PDF) with large statistics (10 5 trials) across a wide time scale from 5 ns to 1 μs. The skew normal distribution function is found to be a good one to fit the measured switching PDF down to low values, which would be used as a guideline to extrapolate read disturb rate (RDR) and write error rate (WER) in STT-RAM design. Moreover, the asymmetry of switching probability density function is observed to flip when the pulse width decreases. It is related to the fluctuation mechanism transition from the thermal agitation to the initial magnetization trajectory dispersion.",

keywords = "Magnetic tunnel junction, STT-RAM, spin transfer torque switching",

author = "Hui Zhao and Yisong Zhang and Amiri, {Pedram Khalili} and Katine, {Jordan A.} and Juergen Langer and Hongwen Jiang and Krivorotov, {Ilya N.} and Wang, {Kang L.} and Wang, {Jian Ping}",

note = "Funding Information: This work was supported in part by the DARPA STT-RAM program (Grant No. HR0011-09-C-0114) and NSF MRSEC Program at University of Minnesota (Grants No. DMR-0819885). The work of J.-P. Wang, H. Zhao, and Y. Zhang was supported in part by an Intel University Research Grant.",

year = "2012",

doi = "10.1109/TMAG.2012.2197815",

language = "English (US)",

volume = "48",

pages = "3818--3820",

journal = "IEEE Transactions on Magnetics",

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T1 - Spin-torque driven switching probability density function asymmetry

AU - Zhao, Hui

AU - Zhang, Yisong

AU - Amiri, Pedram Khalili

AU - Katine, Jordan A.

AU - Langer, Juergen

AU - Jiang, Hongwen

AU - Krivorotov, Ilya N.

AU - Wang, Kang L.

AU - Wang, Jian Ping

N1 - Funding Information: This work was supported in part by the DARPA STT-RAM program (Grant No. HR0011-09-C-0114) and NSF MRSEC Program at University of Minnesota (Grants No. DMR-0819885). The work of J.-P. Wang, H. Zhao, and Y. Zhang was supported in part by an Intel University Research Grant.

PY - 2012

Y1 - 2012

N2 - We studied the spin transfer torque (STT) driven switching voltage distribution systematically by characterizing the switching probability density function (PDF) with large statistics (10 5 trials) across a wide time scale from 5 ns to 1 μs. The skew normal distribution function is found to be a good one to fit the measured switching PDF down to low values, which would be used as a guideline to extrapolate read disturb rate (RDR) and write error rate (WER) in STT-RAM design. Moreover, the asymmetry of switching probability density function is observed to flip when the pulse width decreases. It is related to the fluctuation mechanism transition from the thermal agitation to the initial magnetization trajectory dispersion.

AB - We studied the spin transfer torque (STT) driven switching voltage distribution systematically by characterizing the switching probability density function (PDF) with large statistics (10 5 trials) across a wide time scale from 5 ns to 1 μs. The skew normal distribution function is found to be a good one to fit the measured switching PDF down to low values, which would be used as a guideline to extrapolate read disturb rate (RDR) and write error rate (WER) in STT-RAM design. Moreover, the asymmetry of switching probability density function is observed to flip when the pulse width decreases. It is related to the fluctuation mechanism transition from the thermal agitation to the initial magnetization trajectory dispersion.

KW - Magnetic tunnel junction

KW - STT-RAM

KW - spin transfer torque switching

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 11

M1 - 6332615

ER -

Spin-torque driven switching probability density function asymmetry

Abstract

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Keywords

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