DOI: 10.1063/1.2938843. Analysis of current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy

Analysis of current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy

10.1063/1.2938843

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

Current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy is studied by using micromagnetic simulations, supported by a one-dimensional model of wall dynamics. The threshold current density of perpendicular anisotropy strips is much smaller than that of in-plane anisotropy strips, and is almost independent of the pinning potential strength. This results from the narrower domain wall width, smaller hard-axis anisotropy, and the larger ratio of the depinning field and hard-axis anisotropy. In the one-dimensional model with a zero damping constant, the threshold current density is found to be about 0.72 of the intrinsic threshold current density for a perfect strip in a strong pinning regime that corresponds to strips with perpendicular magnetic anisotropy. The fact that the threshold current density from the pinning sites is smaller than the intrinsic current density is because the effective field, equivalent to the pinning potential, enhances a breakdown in the pinning site. Moreover, in the strong pinning regime, an opposite-direction depinning hardly ever occurs after current pulse is turned off. These features of strips with perpendicular magnetic anisotropy are attractive for magnetic random access memories where the domain wall should be moved stably between the pinning sites with the small current pulse.

Bibliography

Suzuki, T., Fukami, S., Ohshima, N., Nagahara, K., & Ishiwata, N. (2008). Analysis of current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy. Journal of Applied Physics, 103(11).

Authors 5

T. Suzuki (first)
S. Fukami (additional)
N. Ohshima (additional)
K. Nagahara (additional)
N. Ishiwata (additional)

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Dates

Type	When
Created	17 years, 2 months ago (June 11, 2008, 6:12 p.m.)
Deposited	2 years, 1 month ago (July 5, 2023, 2:07 p.m.)
Indexed	4 weeks ago (July 30, 2025, 6:50 a.m.)
Issued	17 years, 2 months ago (June 1, 2008)
Published	17 years, 2 months ago (June 1, 2008)
Published Online	17 years, 2 months ago (June 11, 2008)
Published Print	17 years, 2 months ago (June 1, 2008)

Funders 0

None

BibTeX

@article{Suzuki_2008, title={Analysis of current-driven domain wall motion from pinning sites in nanostrips with perpendicular magnetic anisotropy}, volume={103}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.2938843}, DOI={10.1063/1.2938843}, number={11}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Suzuki, T. and Fukami, S. and Ohshima, N. and Nagahara, K. and Ishiwata, N.}, year={2008}, month=jun }

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