Effect of wavy spin-transfer torque on ultrafast unipolar switching of a nanomagnet with out-of-plane polarizer

Seo Won Lee; Kyung Jin Lee

doi:10.1109/TMAG.2011.2158399

Effect of wavy spin-transfer torque on ultrafast unipolar switching of a nanomagnet with out-of-plane polarizer

Seo Won Lee, Kyung Jin Lee

Department of Materials Science and Engineering

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

4 Citations (Scopus)

Abstract

We report that current-induced ultrafast unipolar switching can be realized by utilizing wavy spin-transfer torque (STT) and out-of-plane polarizer. Two spin-valve structures with normal STT and wavy STT are studied to investigate the effect of wavy STT on ultrafast precessional switching. We find that for the structure with normal STT, only antiparallel (AP)-to-parallel (P) switching occurs in one polarity of current whereas for the structure with wavy STT, both P-to-AP and AP-to-P switchings occur, showing alternative switching patterns as a function of current and pulse width.

Original language	English
Article number	6027797
Pages (from-to)	3872-3875
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	47
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2011.2158399
Publication status	Published - 2011 Oct

Keywords

Spin-transfer torque (STT)
ultrafast switching
wavy spin-transfer torque

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2011.2158399

Cite this

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title = "Effect of wavy spin-transfer torque on ultrafast unipolar switching of a nanomagnet with out-of-plane polarizer",

abstract = "We report that current-induced ultrafast unipolar switching can be realized by utilizing wavy spin-transfer torque (STT) and out-of-plane polarizer. Two spin-valve structures with normal STT and wavy STT are studied to investigate the effect of wavy STT on ultrafast precessional switching. We find that for the structure with normal STT, only antiparallel (AP)-to-parallel (P) switching occurs in one polarity of current whereas for the structure with wavy STT, both P-to-AP and AP-to-P switchings occur, showing alternative switching patterns as a function of current and pulse width.",

keywords = "Spin-transfer torque (STT), ultrafast switching, wavy spin-transfer torque",

author = "Lee, {Seo Won} and Lee, {Kyung Jin}",

note = "Funding Information: This work was supported by the IT R&D Program of MKE/ KEIT under Grant 2009-F-004-01, the Korea Science and Engineering Foundation through the Basic Research Program funded by the Ministry of Science and Technology, Korea, under Grant 2010-0023798, and the Degree and Research Center Program funded by the Korea Research Council of Fundamental Science and Technology.",

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doi = "10.1109/TMAG.2011.2158399",

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PY - 2011/10

Y1 - 2011/10

N2 - We report that current-induced ultrafast unipolar switching can be realized by utilizing wavy spin-transfer torque (STT) and out-of-plane polarizer. Two spin-valve structures with normal STT and wavy STT are studied to investigate the effect of wavy STT on ultrafast precessional switching. We find that for the structure with normal STT, only antiparallel (AP)-to-parallel (P) switching occurs in one polarity of current whereas for the structure with wavy STT, both P-to-AP and AP-to-P switchings occur, showing alternative switching patterns as a function of current and pulse width.

AB - We report that current-induced ultrafast unipolar switching can be realized by utilizing wavy spin-transfer torque (STT) and out-of-plane polarizer. Two spin-valve structures with normal STT and wavy STT are studied to investigate the effect of wavy STT on ultrafast precessional switching. We find that for the structure with normal STT, only antiparallel (AP)-to-parallel (P) switching occurs in one polarity of current whereas for the structure with wavy STT, both P-to-AP and AP-to-P switchings occur, showing alternative switching patterns as a function of current and pulse width.

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Effect of wavy spin-transfer torque on ultrafast unipolar switching of a nanomagnet with out-of-plane polarizer

Abstract

Keywords

ASJC Scopus subject areas

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