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Magnetoresistance of FexNi80-xCr20 (50<or=x<or=66) and Fe25Cr75 alloys

Banerjee, S and Raychaudhuri, AK (1993) Magnetoresistance of FexNi80-xCr20 (50<or=x<or=66) and Fe25Cr75 alloys. In: Journal of Physics: Condensed Matter, 5 (20). L295-L298.

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Official URL: http://iopscience.iop.org/0953-8984/5/20/002/

Abstract

The authors have measured longitudinal and transverse magnetoresistance (MR) of crystalline pseudo-binary alloys FexNi80-xCr20 (50<or=x<or=66) and the binary alloy Fe25Cr75. Both the alloy systems have complex magnetic phases because the alloys have compositions close to the critical composition regime for ferromagnetism. While the Fe-Ni-Cr alloys have a FCC gamma -phase, the binary Fe-Cr alloy has a BCC alpha -phase. This gives an opportunity to compare magnetoresistances for gamma -phase and alpha -phase Fe alloys when they lie close to the critical composition. The experiments were conducted at 4.2 K with magnetic fields up to 7 T. The authors observed that all the alloys show negative magnetoresistance at 4.2 K in fields up to 7 T. However, for the gamma -phase alloys the typical maximum MR ( Delta rho / rho ) is about 1%, while for the alpha -phase alloy it is 10%. In the gamma -phase alloys there is a small but finite anisotropy of MR in the phases with long-range magnetic order which gradually vanishes near the critical region (x=xc approximately=59-63) when it becomes a spin glass. In the range x approximately=xc, Delta rho / rho varies as Mn (M=magnetization) with n approximately=2.

Item Type: Editorials/Short Communications
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 11 Feb 2011 08:55
Last Modified: 11 Feb 2011 08:55
URI: http://eprints.iisc.ernet.in/id/eprint/35532

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