Dynamics of magnetization switching of exchange-coupled trilayers by using a micromagnetic simulation

K. S. Kim, H. J. Lee, Sang Ho Lim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A micromagnetic simulation of the dynamics of magnetization switching is performed in exchangecoupled trilayers consisting of two ferromagnetic layers separated by a very thin non-magnetic spacer. The elliptical magnetic thin films with lateral dimensions of 200 nm (long axis) × 100 nm (short axis) and with a total magnetic layer thickness of 4 nm are considered. The spin-flop field and the saturation field obtained under static conditions are found to vary significantly with the thickness asymmetry, but a much smaller dependence is observed in the direct write field. The dynamics of magnetization switching is characterized by an abrupt coherent rotation, followed by oscillations that eventually die out at a pulse duration time of 10 ∼ 20 ns, depending on the magnetization component and the final magnetic state. The coherent rotation occurs at a short pulse duration time of 1 ∼ 2 ns. The oscillations in the two magnetic layers are completely in phase and the frequency estimated from a Fourier analysis is 1.0 GHz. A large difference in the dynamic switching behavior is also observed to exist, depending on the final magnetic state.

Original languageEnglish
Pages (from-to)1492-1497
Number of pages6
JournalJournal of the Korean Physical Society
Volume53
Issue number3
Publication statusPublished - 2008 Sep 1

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magnetization
pulse duration
oscillations
simulation
Fourier analysis
spacers
asymmetry
saturation
thin films

Keywords

  • Dynamics of magnetization switching
  • Exchange-coupled trilayers
  • Magnetic random access memory
  • Micromagnetic simulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Dynamics of magnetization switching of exchange-coupled trilayers by using a micromagnetic simulation. / Kim, K. S.; Lee, H. J.; Lim, Sang Ho.

In: Journal of the Korean Physical Society, Vol. 53, No. 3, 01.09.2008, p. 1492-1497.

Research output: Contribution to journalArticle

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N2 - A micromagnetic simulation of the dynamics of magnetization switching is performed in exchangecoupled trilayers consisting of two ferromagnetic layers separated by a very thin non-magnetic spacer. The elliptical magnetic thin films with lateral dimensions of 200 nm (long axis) × 100 nm (short axis) and with a total magnetic layer thickness of 4 nm are considered. The spin-flop field and the saturation field obtained under static conditions are found to vary significantly with the thickness asymmetry, but a much smaller dependence is observed in the direct write field. The dynamics of magnetization switching is characterized by an abrupt coherent rotation, followed by oscillations that eventually die out at a pulse duration time of 10 ∼ 20 ns, depending on the magnetization component and the final magnetic state. The coherent rotation occurs at a short pulse duration time of 1 ∼ 2 ns. The oscillations in the two magnetic layers are completely in phase and the frequency estimated from a Fourier analysis is 1.0 GHz. A large difference in the dynamic switching behavior is also observed to exist, depending on the final magnetic state.

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