GIANT MAGNETORESISCANCE IN SPINTRONIC CO/PT NANOWIRE STRUCTURES
Journal Title: Metrology and Measurement Systems - Year 2008, Vol 15, Issue 2
Abstract
We used electrodeposition for growing of pure metallic, alloy and multilayer nanowires. Electrodeposition of cobalt/platinum nanowires was achieved in the cylindrical pores of a commercially available nuclear tracked polycarbonate membrane. In order to make an ohmic contact, prior to electrodeposition one side (the back one) of the membranes was coated with gold, using a simple evaporation technique. An assembly of nanowires with an average diameter of 80 nm and a length of 6 microns was achieved. Our multilayer nanowires were grown from an electrolyte containing Co2+ and Pt2+ ions. The samples were then characterized using scanning and transmission electron microscopy. The selected area diffraction patterns of the wires showed that the growth is polycrystalline, though the measured grain size was relatively large [1]. Magnetic properties of the nanowires were studied using vibrating sample magnetometry (VSM). Resistivity of the Co/Pt multilayer nanowires then was measured as a function of applied magnetic field in both parallel and perpendicular to the nanowire growth directions. The samples clearly exhibit a giant magnetoresistance (GMR) effect which can be explained in terms of spin-dependent scattering phenomena. The results are of particular interest since they promise potential devices for nano-magnetic sensors, especially devices based on spintronic materials [2, 3, 4].
Authors and Affiliations
GHOLAMREZA NABIYOUNI
Keywords
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