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od 2020-09-20

Title: Domain wall generated by graded interlayer coupling in Co/Pt/Co film with perpendicular anisotropy

Source: Applied Physics Letters

Year : 2015

Abstract:

A magnetic multilayer of the structure substrate/Pt-15 nm/Co-0.8 nm/Pt-wedge(0-7 nm)/Co-0.6 nm/ Pt-2 nm is characterized by perpendicular anisotropy of both Co layers. For a Pt spacer thickness t(Pt) <= 2.6 nm, the magnetization reversal of the Co-layers occurs cooperatively, while for larger t(Pt), it occurs sequentially. The Co-layer with 0.6 nm thickness (Co-S) is magnetically softer than the second one (Co-H). In the 2.6 <= t(Pt) <= 3.0 nm range, there are significant changes of the switching field due to a strong gradient of the interlayer coupling. In this region, the magnetization reversal in the Co-S layer takes place reversibly by the propagation of a single, straight domain wall. This specific nature of magnetization reversal is explained by a decelerated motion of the domain wall observed both for the direction corresponding to the increasing, as well as decreasing coupling energy.

DOI: 10.1063/1.4926357   (Pobrane:  2018-03-29)