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Imaging magnetic flux-closure domains and domain walls in electroless-deposited CoNiB nanotubes

Stano, Michal ; Schaefer, Sandra ; Wartelle, Alexis ; Rioult, Maxime ; Belkhou, Rachid ; Sala, Alessandro ; Mentes, Tevfik Onur ; Locatelli, Andrea ; Cagnon, Laurent ; Trapp, Beatrix ; Bochmann, Sebastian ; Martin, Sylvain ; Gautier, Eric ; Toussaint, Jean-Christophe ; Ensinger, Wolfgang ; Fruchart, Olivier (2017):
Imaging magnetic flux-closure domains and domain walls in electroless-deposited CoNiB nanotubes.
In: Condensed Matter - Materials Science, [Article]

Abstract

Magnetic nanotubes are predicted to host mag- netic domains and domain walls with a topology different from that for at elements[1, 2]. Com- pared to cylindrical nanowires, reports on mag- netism of isolated metallic nanotubes are scarce and so far no material has given rise to well- defined magnetic domains. Here we report the fabrication of high-aspect ratio CoNiB nanotubes by electroless plating inside a porous template. Through imaging, we evidenced multiple mag- netic domains and domain walls in these nano- tubes. Surprisingly, magnetization in the do- mains is orthoradial (azimuthal, vortex-like), a situation not anticipated by theory for long nano- tubes. The material is therefore technologically appealing for a dense 3D magnetic device such as the racetrack memory[3] (based on shifting mag- netic walls), as ux-closure domains should efi- ciently prevent cross-talk related to internal di- polar fields. Further, we show tuning of a growth- induced anisotropy and thus of the magnetic state of the tube by annealing.

Item Type: Article
Erschienen: 2017
Creators: Stano, Michal ; Schaefer, Sandra ; Wartelle, Alexis ; Rioult, Maxime ; Belkhou, Rachid ; Sala, Alessandro ; Mentes, Tevfik Onur ; Locatelli, Andrea ; Cagnon, Laurent ; Trapp, Beatrix ; Bochmann, Sebastian ; Martin, Sylvain ; Gautier, Eric ; Toussaint, Jean-Christophe ; Ensinger, Wolfgang ; Fruchart, Olivier
Title: Imaging magnetic flux-closure domains and domain walls in electroless-deposited CoNiB nanotubes
Language: English
Abstract:

Magnetic nanotubes are predicted to host mag- netic domains and domain walls with a topology different from that for at elements[1, 2]. Com- pared to cylindrical nanowires, reports on mag- netism of isolated metallic nanotubes are scarce and so far no material has given rise to well- defined magnetic domains. Here we report the fabrication of high-aspect ratio CoNiB nanotubes by electroless plating inside a porous template. Through imaging, we evidenced multiple mag- netic domains and domain walls in these nano- tubes. Surprisingly, magnetization in the do- mains is orthoradial (azimuthal, vortex-like), a situation not anticipated by theory for long nano- tubes. The material is therefore technologically appealing for a dense 3D magnetic device such as the racetrack memory[3] (based on shifting mag- netic walls), as ux-closure domains should efi- ciently prevent cross-talk related to internal di- polar fields. Further, we show tuning of a growth- induced anisotropy and thus of the magnetic state of the tube by annealing.

Journal or Publication Title: Condensed Matter - Materials Science
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 21 Jul 2017 11:10
Funders: M.S. acknowledges grant from the Laboratoire d'excellence LANEF in Grenoble (ANR-10-LABX-51-01)., S.S. gratefully acknowledge funding by the LOEWE project RESPONSE of the Hessen State Ministry of Higher Education, Research and the Arts (HMWK).
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