Journal
NANOTECHNOLOGY
Volume 27, Issue 33, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0957-4484/27/33/335301
Keywords
segmented nanowires; nanoporous alumina templates; Curie temperature; shape anisotropy; electrodeposition; finite-size scaling relation
Funding
- FCT [SFRH/BPD/84948/2012, SFRH/BPD/82010/2011]
- POPH/FSE
- Brazilian agency CNPq [234513/2014-4 C]
- Brazilian agency CAPES [234513/2014-4 C]
- Brazilian agency FAPERJ [234513/2014-4 C]
- FCT through the Associated Laboratory IN [UID/NAN/50024/2013]
- FEDER
- ON2 [Norte-070124-FEDER-000070]
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The fabrication of segmented Ni/Cu nanowires (NWs), with tunable structural and magnetic properties, is reported. A potentiostatic electrodeposition method with a single electrolytic bath has been used to fabricate multisegmented Ni/Cu NWs inside a highly hexagonally ordered anodic nanoporous alumina membrane, with diameters of 50 nm and Ni segment lengths (L-Ni) tuned from 10 nm up to 140 nm. The x-ray diffraction results evidenced a strong dependence of the Ni NWs crystallographic face-centered-cubic (fcc) texture along the [220] direction on the aspect ratio of the NWs. The magnetic behavior of the multisegmented Ni/Cu NW arrays, as a function of the magnetic field and temperature, is also studied and correlated with their structural and morphological properties. Micromagnetic simulations, together with the experimental results, showed a dominant antiferromagnetic coupling between Ni segments along the wire length for small low aspect-ratio magnetic segments. When increasing the Ni segments' length, the magnetic interactions between these along the wire became stronger, favouring a ferromagnetic coupling. The Curie temperature of the NWs was also found to strongly depend on the Ni magnetic segment length. Particularly the Curie temperature was found to be reduced 75 K for the 20 nm Ni segments, following the finite-size scaling relation with xi(0) = 8.1 angstrom and gamma = 0.48. These results emphasize the advantages of using a template assisted method to electrodeposit multilayer NWs, as it allows an easy tailor of the respective morphological, chemical, structural and magnetic properties.
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