Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy

Details Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy

2009-01-28

arxiv.org/abs/0901.4562v1

Applied Physics Letters, 94, 042507 (2009)

Physics

Condensed Matter

Materials Science

12 pages, 3 figures

Scientific paper

10.1063/1.3075061

We demonstrate a simple method to tailor the magnetization reversal mechanisms of Co/Pt multilayers by depositing them onto large area nanoporous anodized alumina (AAO) with various aspect ratios, A = pore depth/diameter. Magnetization reversal of composite (Co/Pt)/AAO films with large A is governed by strong domain-wall pinning which gradually transforms into a rotation-dominated reversal for samples with smaller A, as investigated by a first-order reversal curve method in conjunction with analysis of the angular dependent switching fields. The change of the magnetization reversal mode is attributed to topographical changes induced by the aspect ratio of the AAO templates.

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