Direct observation of domain wall surface tension by deflating or inflating a magnetic bubble

Abstract : The surface energy of a magnetic Domain Wall (DW) strongly affects its static and dynamic behaviours. However, this effect was seldom directly observed and many related phenomena have not been well understood. Moreover, a reliable method to quantify the DW surface energy is still missing. Here, we report a series of experiments in which the DW surface energy becomes a dominant parameter. We observed that a semicircular magnetic domain bubble could spontaneously collapse under the Laplace pressure induced by DW surface energy. We further demonstrated that the surface energy could lead to a geometrically induced pinning when the DW propagates in a Hall cross or from a nanowire into a nucleation pad. Based on these observations, we developed two methods to quantify the DW surface energy, which could be very helpful to estimate intrinsic parameters such as Dzyaloshinskii-Moriya Interactions (DMI) or exchange stiffness in magnetic ultra-thin films.
Type de document :
Pré-publication, Document de travail
14 pages, 6 figures. 2017
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https://hal.archives-ouvertes.fr/hal-01614287
Contributeur : Laurent Vila <>
Soumis le : mardi 10 octobre 2017 - 16:32:34
Dernière modification le : vendredi 9 mars 2018 - 16:38:03

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  • HAL Id : hal-01614287, version 1
  • ARXIV : 1708.06719

Citation

Xueying Zhang, Nicolas Vernier, Weisheng Zhao, Haiming Yu, Laurent Vila, et al.. Direct observation of domain wall surface tension by deflating or inflating a magnetic bubble. 14 pages, 6 figures. 2017. 〈hal-01614287〉

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