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Magneto-sensitive nickel nanowires fabricated by electrodeposition into multi- and single-ion track templates
Uppsala University, The Svedberg Laboratory.
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2006 (English)In: Journal of Applied Electrochemistry, ISSN 0021-891X, E-ISSN 1572-8838, Vol. 36, no 10, 1157-1162 p.Article in journal (Refereed) Published
Abstract [en]

Polycarbonate templates of ( 30 +/- 1) mu m thickness containing cylindrical etched-track nanochannels of ( 500 +/- 50) nm diameter were used for electrodeposition of Ni nanowires. Using 10(4) channels per cm(2), the most favourable deposition potential of -1.0 V was determined in a potentiostatic mode by varying the deposition potential with respect to an Ag/AgCl reference electrode over a range between -0.1 V and -1.5 V. The deposition efficiency at -1.0 V was estimated around 10%. The resulting single wires had a resistance around 200 W and showed an anisotropic magnetoresistance (AMR) effect of 1%, applicable to directionally sensitive magnetic field sensors.

Place, publisher, year, edition, pages
2006. Vol. 36, no 10, 1157-1162 p.
Keyword [en]
electrodeposition, ion beam, magnetoresistance, nanochannel, nickel, polycarbonate
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-22393DOI: 10.1007/s10800-006-9200-5ISI: 000240514700012OAI: oai:DiVA.org:uu-22393DiVA: diva2:50166
Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2011-06-17Bibliographically approved
In thesis
1. Ion Tracks for Micro- and Nanofabrication: From Single Channels to Superhydrophobic Surfaces
Open this publication in new window or tab >>Ion Tracks for Micro- and Nanofabrication: From Single Channels to Superhydrophobic Surfaces
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A method is described for preset-count irradiations between 1 and 100 ions singling-out individual ions from an ion beam with more than a billion ions arriving per second. The ion tracks are etched in a conductometric system with real-time evaluation of the acquired data. The etch process can be interrupted when reaching a preset channel diameter. Cylindrical channels are obtained by adding surfactants to the etch solution forming a self-assembled barrier between etching medium and polymer. Asymmetric etching of single ion tracks leads to pH sensitive conical pores with diode-like properties. Using etched channels as template, homogeneous and multilayer magnetic single-wires are electrodeposited. The magnetoresistivity of the wires is studied. Single-track applications comprise critical apertures (cylindric, conic, necked), asymmetric pores (pH sensitive, biospecific), Giant Magneto Resistance sensors, and spintronic devices.

On the basis of studies with individual ion tracks we tackled tilted multiporous systems such as ion beam lithography with a masked ion beam leading to micro-structures with inclined walls and anisotropic superhydrophobic ion track textures, analogous to biological shingle structures on butterfly wings. We demonstrated qualitatively, that the asymmetry of the texture translates into motion under ultrasonic agitation. This could lead to the development of rotary drives.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 63 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 700
Ion track, single ion, real time, phase detection, conductometric cell, conductometry, electro replication, microtechnology, nanotechnology, surfactant, self organization, GMR, magnetic, sensor technology, hydrophobic, tilted texture.
National Category
Physical Sciences
Research subject
Materials Science
urn:nbn:se:uu:diva-111247 (URN)978-91-554-7683-0 (ISBN)
Public defence
2010-01-29, Polhemsaalen, Ångström Laboratorium, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Available from: 2010-01-07 Created: 2009-12-08 Last updated: 2010-01-15

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