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Differences in the Magnetic Properties of Co, Fe and Ni 250-300 nm Wide Nanowires Electrodeposited in Amorphous Anodized Alumina Templates
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Materialkemi)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2005 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 17, no 7, 1829-1834 p.Article in journal (Refereed) Published
Abstract [en]

Anodized alumina membranes (AAMs) were synthesized by a three-step electrochemical anodization of aluminum. The anodization results in a hexagonally pseudo-ordered 2D array of nanochannels. The AAMs were used as templates to grow Ni, Co, Fe nanowires, with diameters in the range of 250-300 nm, by electrodeposition. The AAM appears to be amorphous, while the metal nanowires are polycrystalline. The angular dependence of the coercivity, HC, of the Ni nanowires presents a smooth variation from a moHC = 5.5 mT when the field is applied perpendicular to the wires to moHC = 53 mT when the field is applied parallel to them. However, the Co and Fe nanowires exhibit a peak in the angular dependence of HC for fields applied close to the AAM plane (i.e. perpendicular to the wires). The competition between shape anisotropy and dipolar interaction between the nanowires seems to be responsible for the difference in magnetic behavior between the different metals.

Place, publisher, year, edition, pages
2005. Vol. 17, no 7, 1829-1834 p.
Keyword [en]
Anodized alumina membranes, Nanowires, Electrodeposition, Magnetic properties, Angular dependence
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9219DOI: 10.1021/cm047870qISI: 000228106700029Scopus ID: 2-s2.0-18244378771OAI: oai:DiVA.org:kth-9219DiVA: diva2:37650
Note
QC 20100908Available from: 2008-10-09 Created: 2008-10-09 Last updated: 2010-09-08Bibliographically approved

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