Article

TEM and electron holography analyses of granular and thin layered Cu-Co magnetic materials

Ultramicroscopy (impact factor: 2.47). 01/2010; 110:433. pp.433

ABSTRACT The paper shows the examples of application of transmission electron microscopy (TEM) techniques for characterization of two types of copper-cobalt magnetic nanomaterials: Cu-10 wt% Co granular giant magnetoresistance (GMR) thin ribbons and thin nanocrystalline Co films deposited on Cu substrate. Quantitative TEM microstructural analyses were used for determination of Co particle size distributions in GMR ribbons. It was demonstrated that the relative resistivity depends on the mean diameter of the cobalt nanoparticles. For nanocrystalline thin Co layers, off-axis electron holography was used to investigate their magnetic structure. The mean in-plane component of the magnetic field in cobalt was calculated from the phase gradient.

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Keywords

Co particle size distributions
 
cobalt nanoparticles
 
Cu-10 wt% Co granular giant magnetoresistance
 
examples
 
mean diameter
 
mean in-plane component
 
phase gradient
 
Quantitative TEM microstructural analyses
 
relative resistivity
 
thin nanocrystalline Co films
 
transmission electron microscopy