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

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3958

Lastpage

3960

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 Cu₂MnAl 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489829

Filename

489829