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Applied Physics Letters / Volume 99 / Issue 22 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 99, 222505 (2011); http://dx.doi.org/10.1063/1.3664225 (3 pages)

Micromagnetic study of current-pulse-induced magnetization switching in magnetic tunnel junctions with antiferromagnetically and ferromagnetically coupled synthetic free layers

Chikako Yoshida1, Young Min Lee1, Takao Ochiai1, Yuji Uehara2, and Toshihiro Sugii1

1Low-power Electronics Association & Project, 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan
2Fujitsu Limited, 4-1-1, Kami-odanaka, Nakahara-ku, Kawasaki, Kanagawa 211-8588, Japan

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(Received 6 June 2011; accepted 5 November 2011; published online 28 November 2011)

We investigated the dynamics of current-pulse-induced magnetization switching in magnetic tunnel junctions (MTJs) with antiferromagnetically and ferromagnetically coupled synthetic free layers through micromagnetic simulations. We found that a magnetic vortex is formed in thick upper ferromagnetic layers and plays an important role in magnetization switching in both types of synthetic free layers. Furthermore, higher thermal stability is observed in an MTJ with the ferromagnetically coupled free layer at an annealing temperature of 250 °C.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

annealing, antiferromagnetic materials, ferromagnetic materials, magnetic multilayers, magnetic switching, magnetic tunnelling, magnetisation, micromagnetics, thermal stability, vortices

PACS

  • 75.70.Cn

    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

  • 75.45.+j

    Macroscopic quantum phenomena in magnetic systems

  • 75.47.-m

    Magnetotransport phenomena; materials for magnetotransport

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.78.Cd

    Micromagnetic simulations

  • 75.78.Jp

    Ultrafast magnetization dynamics and switching

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3664225

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Yakata, H. Kubota, T. Sugano, T. Seki, K. Yakushiji, A. Fukushima, S. Yuasa, and K. Ando, Appl. Phys. Lett. 95, 242504 (2009)APPLAB000095000024242504000001.

    M. Ichimura, T. Hamada, H. Imamura, S. Takahashi, and S. Maekawa, J. Appl. Phys. 105, 07D120 (2009)JAPIAU00010500000707D120000001.

    C. Y. You, J. Appl. Phys. 107, 073911 (2010)JAPIAU000107000007073911000001.

    J.-G. Zhu, J. Appl. Phys. 91, 7273 (2002)JAPIAU000091000010007273000001.

    X. Zhu and S. H. Kang, J. Appl. Phys. 106, 113906 (2009)JAPIAU000106000011113906000001.

    K. J. Lee and B. Dieny, Appl. Phys. Lett. 88, 132506 (2006)APPLAB000088000013132506000001.


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