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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.
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https://hal.archives-ouvertes.fr/hal-01614287
Contributor : Laurent Vila <>
Submitted on : Tuesday, October 10, 2017 - 4:32:34 PM
Last modification on : Friday, November 6, 2020 - 4:25:04 AM

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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. Physical Review Applied, American Physical Society, 2017, 9, pp.024032. ⟨10.1103/PhysRevApplied.9.024032⟩. ⟨hal-01614287⟩

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