Vertical shift register using dipolar interaction in magnetic multilayers

Shin Liang Chin, Amalio Fernández-Pacheco, Dorothée C M C Petit, Russell P. Cowburn

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A vertical shift register consisting of multi-layered ferromagnetic bars with in-plane magnetization is investigated numerically using macrospin simulations. These layers are anti-ferromagnetically coupled via dipolar interactions and their in-plane aspect ratio determines their anisotropy. A single data bit is represented by a magnetic kink soliton, which forms at the boundary of two anti-parallel domains with opposite phases. It can be propagated bi-directionally using an externally applied rotating magnetic field. The soliton propagation is dependent on the applied field strength, the magnetic anisotropy of the ferromagnetic layers, and the dipolar coupling energies. For the device investigated here, the largest field range for soliton propagation is found to be from 35 Oe to 235 Oe at a lateral aspect ratio of 1.33. The soliton is also subjected to edge effects where it can be either pinned or reflected rather than being expelled from the stack. It is found that by reducing the thickness of the edge layer, these effects can be reduced substantially. By reducing the thickness of the edge layer by 20%, the field range in which the soliton is expelled increases by more than a factor of two.

Original languageEnglish
Article number233905
JournalJournal of Applied Physics
Volume118
Issue number23
DOIs
Publication statusPublished - 21 Dec 2015
Externally publishedYes

Fingerprint

shift registers
solitary waves
interactions
aspect ratio
anisotropy
propagation
field strength
magnetization
magnetic fields
simulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Chin, S. L., Fernández-Pacheco, A., Petit, D. C. M. C., & Cowburn, R. P. (2015). Vertical shift register using dipolar interaction in magnetic multilayers. Journal of Applied Physics, 118(23), [233905]. https://doi.org/10.1063/1.4937915

Vertical shift register using dipolar interaction in magnetic multilayers. / Chin, Shin Liang; Fernández-Pacheco, Amalio; Petit, Dorothée C M C; Cowburn, Russell P.

In: Journal of Applied Physics, Vol. 118, No. 23, 233905, 21.12.2015.

Research output: Contribution to journalArticle

Chin, SL, Fernández-Pacheco, A, Petit, DCMC & Cowburn, RP 2015, 'Vertical shift register using dipolar interaction in magnetic multilayers', Journal of Applied Physics, vol. 118, no. 23, 233905. https://doi.org/10.1063/1.4937915
Chin SL, Fernández-Pacheco A, Petit DCMC, Cowburn RP. Vertical shift register using dipolar interaction in magnetic multilayers. Journal of Applied Physics. 2015 Dec 21;118(23). 233905. https://doi.org/10.1063/1.4937915
Chin, Shin Liang ; Fernández-Pacheco, Amalio ; Petit, Dorothée C M C ; Cowburn, Russell P. / Vertical shift register using dipolar interaction in magnetic multilayers. In: Journal of Applied Physics. 2015 ; Vol. 118, No. 23.
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