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TEM studies in melt-spun Cu-Mn-Al system exhibiting giant magnetoresistance

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4 Author(s)
A. S. Murthy ; Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA ; Li Yiping ; G. C. Hadjipanayis ; K. R. Lawless

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

Published in:

IEEE Transactions on Magnetics  (Volume:31 ,  Issue: 6 )