Title :
Structural evolution and magnetoresistance properties of heat treated Cu80Co15Fe5 ribbons
Author :
Harris, V.G. ; Das, B.N. ; Rubinstein, M. ; Goldberg, J.L. ; Elam, W.T. ; Koon, N.C.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
Heat treated Cu80C15Fe5 melt-spun ribbons are analyzed for their structural and magnetoresistance (MR) properties. Magnetoresistance values are found to be a maximum for the sample annealed at 500°C. Structural characterization using X-ray diffraction and absorption measurements and transmission electron microscopy show this sample to have two precipitate phases within a Cu-rich fcc matrix, i.e., a Co-rich fcc phase and a CoFe bcc phase. Heat treatments at higher temperatures bring about a decrease in MR. Dark field transmission electron microscope (TEM) images illustrate the clustering of the precipitate particles concurrent with the decrease in MR, suggesting that a clustering mechanism may contribute to the MR effect in these materials
Keywords :
EXAFS; X-ray diffraction examination of materials; annealing; cobalt alloys; copper alloys; crystal microstructure; iron alloys; magnetic properties of fine particles; magnetoresistance; melt spinning; precipitation; transmission electron microscope examination of materials; 500 degC; Co-rich fcc phase; CoFe bcc phase; X-ray diffraction; absorption measurements; clustering mechanism; dark field transmission electron microscope images; fcc matrix; heat treated Cu80Co15Fe5 ribbons; magnetoresistance properties; melt-spun ribbons; precipitate particles; precipitate phases; structural characterization; structural evolution; transmission electron microscopy; Annealing; Electromagnetic wave absorption; Iron; Magnetic analysis; Magnetic field measurement; Magnetic properties; Magnetoresistance; Transmission electron microscopy; X-ray diffraction; X-ray imaging;
Journal_Title :
Magnetics, IEEE Transactions on
