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Current perpendicular to plane single-nanowire GMR sensor
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2007 (English)In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 86, no 1, 43-47 p.Article in journal (Refereed) Published
Abstract [en]

By electrochemical deposition in a single nanopore membrane we fabricate Cu/Co layered single nanowires, that exhibit up to 10% magnetoresistance at room temperature. Single nanopore membranes are prepared by irradiating polycarbonate membranes with exactly one swift heavy ion, and by subsequent chemical etching of the single ion track. Both dc and pulsed electrodeposition of single wires consisting of Cu-Co alloy and Cu/Co multilayers respectively, are performed from a bath containing the two metal ions. By sputtering a gold electrode on the upper membrane surface, the single nanowire embedded in the flexible polymer foil is reliably contacted. While alloy wires exhibit anisotropic magnetoresistance (AMR), multilayer wires display current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) behavior. This demonstrates that both the fabrication and contacting methods are very suitable for the investigation of transport properties, without the necessity of lithographic processes and without manipulation of the nanowires. In addition, the method opens up many new possibilities for single nanowire-based sensors.

Place, publisher, year, edition, pages
2007. Vol. 86, no 1, 43-47 p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-25856DOI: 10.1007/s00339-006-3738-2ISI: 000242013700006OAI: oai:DiVA.org:uu-25856DiVA: diva2:53630
Available from: 2007-02-15 Created: 2007-02-15 Last updated: 2011-05-13Bibliographically 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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