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

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

Giant magnetoresistance (GMR) has recently been observed in a new system, melt-spun ribbons of Cu-Mn-Al, with /spl Delta/R/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 appear...

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Veröffentlicht in:IEEE Transactions on Magnetics 1995-11, Vol.31 (6), p.3958-3960
Hauptverfasser: Murthy, A.S., Li Yiping, Hadjipanayis, G.C., Lawless, K.R.
Format: Artikel
Sprache:eng
Schlagworte:
ALUMINIUM ALLOYS
Aluminum alloys
CHEMICAL COMPOSITION
Chromium alloys
COPPER ALLOYS
EXPERIMENTAL DATA
Extraterrestrial measurements
Giant magnetoresistance
Iron alloys
Magnetic multilayers
MAGNETORESISTANCE
MANGANESE ALLOYS
MATERIALS SCIENCE
MICROSTRUCTURE
SQUID magnetometers
Transmission electron microscopy
X-ray diffraction
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Zusammenfassung:Giant magnetoresistance (GMR) has recently been observed in a new system, melt-spun ribbons of Cu-Mn-Al, with /spl Delta/R/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 Cu/sub 2/MnAl phase. It has also been observed that GMR existed in all samples consisting of a mixture of varying amounts of Cu/sub 2/MnAl and Cu/sub 9/Al/sub 4/ 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.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.489829