Size effects and origin of easy-axis in nickel nanowire arrays

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dc.contributor.authorKartopu, G.
dc.contributor.authorYalcin, O.
dc.contributor.authorChoy, K. -L.
dc.contributor.authorTopkaya, R.
dc.contributor.authorKazan, S.
dc.contributor.authorAktas, B.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2011
dc.departmentNiğde ÖHÜ
dc.description.abstractHigh quality compact Ni nanowire (NW) arrays with aspect ratios (wire length/diameter) varying between 70-171 for a wire length of similar to 6 mu m, and between 3-400 for a constant wire diameter of 60 nm were successfully grown by direct current electrodeposition into free standing porous alumina templates having a lattice constant, i.e., interpore distance, of 105 nm. The NWs have been investigated using a combination of scanning-and transmission-electron microscopies, selected-area electron diffraction, x-ray diffraction analysis, ferromagnetic resonance (FMR), and vibration sample magnetometer techniques at room temperature. Microscopic and diffraction results show that the wires are uniform and mostly single-crystalline, being 220-oriented along the growth direction. Magnetic properties of samples are heavily dependent on the wire length as well as the diameter or packing factor, P (the volume fraction of wires/template). The FMR spectra and the field orientation dependence of the resonance field values were fitted using the imaginary part of magnetic susceptibility and a dispersion relation of magnetization, including the Bloch-Bloembergen type damping term. Combined with hysteresis (M-H) results, these indicate that the preferred (easy) axis of magnetization is parallel to the NW-axis for P < 33%. On the other hand, strong interwire exchange interactions are determined to supply a magnetization state with preferred axis perpendicular to the wires for samples with P > 33%. Comparison with relatively thick (110 nm diameter) and loosely packed (P similar to 10%) Ni NW arrays suggest that the magnetization reversal mechanism could be that of curling type. (C) 2011 American Institute of Physics. [doi:10.1063/1.3531565]
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [107T635]; European Commission [515703-2]
dc.description.sponsorshipThe support of the Scientific and Technological Research Council of Turkey (TUBITAK) for Project No. 107T635 and the European Commission for the EXCELL Project No. 515703-2 are gratefully acknowledged. We would like to thank Professors Inci Varinli and Talat Ozpozan of Bozok University for providing the facilities for the specimen-preparation laboratory.
dc.identifier.doi10.1063/1.3531565
dc.identifier.issn0021-8979
dc.identifier.issue3
dc.identifier.scopus2-s2.0-79951815698
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://dx.doi.org/10.1063/1.3531565
dc.identifier.urihttps://hdl.handle.net/11480/4754
dc.identifier.volume109
dc.identifier.wosWOS:000287366000057
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherAMER INST PHYSICS
dc.relation.ispartofJOURNAL OF APPLIED PHYSICS
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleSize effects and origin of easy-axis in nickel nanowire arrays
dc.typeArticle

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