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

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

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 and Schaefer, Sandra and Wartelle, Alexis and Rioult, Maxime and Belkhou, Rachid and Sala, Alessandro and Mentes, Tevfik Onur and Locatelli, Andrea and Cagnon, Laurent and Trapp, Beatrix and Bochmann, Sebastian and Martin, Sylvain and Gautier, Eric and Toussaint, Jean-Christophe and Ensinger, Wolfgang and 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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