Domain-wall pinning by local control of anistropy in Pt/Co/Pt strips-

J.H. Franken, M. Hoeijmakers, R. Lavrijsen, H.J.M. Swagten

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Uittreksel

We theoretically and experimentally analyze the pinning of a magnetic domain wall (DW) at engineered anisotropy variations in Pt/Co/Pt strips with perpendicular magnetic anisotropy. An analytical model is derived showing that a step in the anisotropy acts as an energy barrier for the DW. Quantitative measurements are performed showing that the anisotropy can be controlled by focused ion beam irradiation with Ga ions. This tool is used to experimentally study the field-induced switching of nanostrips which are locally irradiated. The boundary of the irradiated area indeed acts as a pinning barrier for the domain wall and the pinning strength increases with the anisotropy difference. Varying the thickness of the Co layer provides an additional way to tune the anisotropy, and it is shown that a thinner Co layer gives a higher starting anisotropy thereby allowing tunable DW pinning in a wider range of fields. Finally, we demonstrate that not only the anisotropy itself, but also the width of the anisotropy barrier can be tuned on the length scale of the domain wall.
Originele taal-2Engels
Artikelnummer024216
Pagina's (van-tot)024216-1/10
Aantal pagina's19
TijdschriftJournal of Physics : Condensed Matter
Volume24
Nummer van het tijdschrift2
DOI's
StatusGepubliceerd - 2012

Vingerafdruk

Domain walls
domain wall
strip
Anisotropy
anisotropy
Magnetic domains
Magnetic anisotropy
Focused ion beams
Energy barriers
magnetic domains
Analytical models
Irradiation
Ions
ion beams
irradiation

Citeer dit

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Domain-wall pinning by local control of anistropy in Pt/Co/Pt strips-. / Franken, J.H.; Hoeijmakers, M.; Lavrijsen, R.; Swagten, H.J.M.

In: Journal of Physics : Condensed Matter, Vol. 24, Nr. 2, 024216, 2012, blz. 024216-1/10.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Domain-wall pinning by local control of anistropy in Pt/Co/Pt strips-

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AB - We theoretically and experimentally analyze the pinning of a magnetic domain wall (DW) at engineered anisotropy variations in Pt/Co/Pt strips with perpendicular magnetic anisotropy. An analytical model is derived showing that a step in the anisotropy acts as an energy barrier for the DW. Quantitative measurements are performed showing that the anisotropy can be controlled by focused ion beam irradiation with Ga ions. This tool is used to experimentally study the field-induced switching of nanostrips which are locally irradiated. The boundary of the irradiated area indeed acts as a pinning barrier for the domain wall and the pinning strength increases with the anisotropy difference. Varying the thickness of the Co layer provides an additional way to tune the anisotropy, and it is shown that a thinner Co layer gives a higher starting anisotropy thereby allowing tunable DW pinning in a wider range of fields. Finally, we demonstrate that not only the anisotropy itself, but also the width of the anisotropy barrier can be tuned on the length scale of the domain wall.

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