Title :
TEM studies in melt-spun Cu-Mn-Al system exhibiting giant magnetoresistance
Author :
Murthy, Anada S. ; Yiping, L. ; Hadjipanayis, Geoge C. ; Lawless, Kenneth R.
Author_Institution :
Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
Giant magnetoresistance (GMR) has recently been observed in a new system, melt-spun ribbons of Cu-Mn-Al, with ΔR/R(0)=15% at 30 K. The GMR behavior in this system has been extensively studied for a range of compositions. It is suggested that the onset of GMR may be attributed to the appearance of tweed microstructure in the ferromagnetic Cu2 MnAl phase. It has also been observed that GMR existed in all samples consisting of a mixture of varying amounts of Cu2MnAl and Cu9Al4 phases. Extensive transmission electron microscopy studies have been carried out to evaluate the microstructural evolution of the tweed and the observed phases, and to correlate the microstructure with the observed GMR behavior
Keywords :
aluminium alloys; amorphous magnetic materials; copper alloys; ferromagnetic materials; giant magnetoresistance; glass structure; magnetoresistance; manganese alloys; melt spinning; metallic glasses; transmission electron microscopy; 30 K; Cu-Mn-Al; Cu9Al4 phase; TEM; ferromagnetic Cu2MnAl phase; giant magnetoresistance; melt-spun Cu-Mn-Al system; tweed microstructure; Aluminum alloys; Chromium alloys; Extraterrestrial measurements; Giant magnetoresistance; Iron alloys; Magnetic multilayers; Microstructure; SQUID magnetometers; Transmission electron microscopy; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
