Controlled domain-wall injection in perpendicularly magnetized strips

Lavrijsen, R.; Franken, J. H.; Kohlhepp, J. T.; Swagten, H. J. M.; Koopmans, B.
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p222502
Academic Journal
For applications of domain wall (DW) motion in magnetic devices, it is vital to control the creation and position of the DW. We use Ga+ irradiation of Pt/Co/Pt strips to locally change the perpendicular magnetic anisotropy. This allows us to controllably inject DWs into a device at a tunable field. The observed initial linear decrease and subsequent increase in the DW injection field upon increasing irradiation dose are explained by micromagnetic simulations and an analytical one-dimensional model.


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