Fast domain walls governed by OErsted fields in cylindrical magnetic nanowires

Abstract : Since its proposal, the idea to vastly increase data storage density with a magnetic non-volatile 3D shift-register has sustained interest in current-induced domain wall (DW) motion. So far, experimental efforts have focused on flat nanostrips, which exhibit a wide range of noteworthy effects, yet suffer from intrinsic DW instabilities limiting their mobility. In contrast, ferromagnetic cylindrical nanowires (NWs) can host a novel type of magnetic DW, namely the Bloch-point wall (BPW), which due to its specific 3D topology should not experience the same fundamental issue. This could give rise to DW velocities over ~1000 m/s and fascinating new physics including coupling to magnetic spin waves, however, experimental evidence of DW dynamics in NWs is lacking until now. Here we report experimental results on current-induced DW motion in NWs with velocities >600 m/s, quantitatively consistent with predictions. Furthermore, our results indicate that although previously disregarded, the OErsted field induced by the current plays instead a crucial and valuable role in stabilising exclusively BPWs.
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https://hal.archives-ouvertes.fr/hal-02075418
Contributor : Olivier Fruchart <>
Submitted on : Thursday, March 21, 2019 - 1:52:04 PM
Last modification on : Monday, April 8, 2019 - 8:44:59 AM

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  • HAL Id : hal-02075418, version 1
  • ARXIV : 1903.08377

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M. Schöbitz, A. de Riz, S. Martin, S. Bochmann, C. Thirion, et al.. Fast domain walls governed by OErsted fields in cylindrical magnetic nanowires. 2019. ⟨hal-02075418⟩

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