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Measurement of the giant magnetoresistance effect in cobalt-silver magnetic nanostructures: nanoparticles.

Garcia-Torres, J, Vallés, E and Gómez, E (2012) Measurement of the giant magnetoresistance effect in cobalt-silver magnetic nanostructures: nanoparticles. Nanotechnology, 23 (40).

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Abstract

Cobalt-silver (Co-Ag) core-shell nanoparticles with different silver thicknesses were prepared by the microemulsion method in a two-step reduction process. Transmission electron microscopy (TEM) characterization revealed the almost monodispersity and nanometric size (in the range 3-5 nm depending on the shell thickness) of the synthesized nanoparticles. However, it was the use of high-resolution TEM that revealed the correct core-shell formation of the nanometric material. The selected area electron diffraction pattern indicated the fcc (face-centered cubic) and hcp (hexagonal close packed) nature for silver and cobalt, respectively. Cyclic voltammetry also allowed the correct core-shell formation to be assured. The magnetic properties revealed the presence of both superparamagnetic and ferromagnetic contributions. Because of the lack of methodology, it was necessary to develop a method to measure the magnetotransport properties of the prepared nanoparticles. The strategy which followed was successful as it was possible to measure these properties: giant magnetoresistance values of 0.1% at room temperature were obtained. The numerical analysis of magnetic and magnetoresistance data indicated the presence of superparamagnetic particles showing interaction among the magnetic moments.

Item Type: Article
Authors :
NameEmailORCID
Garcia-Torres, JUNSPECIFIEDUNSPECIFIED
Vallés, EUNSPECIFIEDUNSPECIFIED
Gómez, EUNSPECIFIEDUNSPECIFIED
Date : 12 October 2012
Identification Number : 10.1088/0957-4484/23/40/405701
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:19
Last Modified : 17 May 2017 13:19
URI: http://epubs.surrey.ac.uk/id/eprint/838749

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