English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Ta/CoFeB/MgO trilayers with perpendicular magnetic anisotropy are oftencharacterised by vanishing or modest values of interfacialDzyaloshinskii-Moriya interaction (DMI), which results in purely Bloch or mixedBloch-N\'eel domain walls (DWs). Here we investigate the creep evolution of theoverall magnetic bubble morphology in these systems under the combined presenceof in-plane and out-of-plane magnetic fields and we show that He$^+$ ionirradiation induces a transition of the internal DW structure towards a fullyN\'eel spin texture. This transition can be correlated to a simultaneousincrease in DMI strength and reduction in saturation magnetisation -- which area direct consequence of the effects of ion irradiation on the bottom and topCoFeB interfaces, respectively. The threshold irradiation dose above which DWsacquire a pure N\'eel character is experimentally found to be between 12$\times$ 10$^{18}$ He$^+$/m$^2$ and 16 $\times$ 10$^{18}$ He$^+$/m$^2$,matching estimations from the one dimensional DW model based on materialparameters. Our results indicate that evaluating the global bubble shape duringits expansion can be an effective tool to sense the internal bubble DWstructure. Furthermore, we show that ion irradiation can be used to achievepost-growth engineering of a desired DW spin texture.

Bloch-to-N\'eel domain wall transition evinced through morphology of magnetic bubble expansion in Ta/CoFeB/MgO layers