Ghosh, S. K. and Dogra, Anjana and Chowdhury, P. and Rajak, S. and Srivastava, C. (2015) Low temperature effect on magnetic conversion and giant magnetoresistance in electrodeposited CoCu/Cu multilayers. Journal of Alloys and Compounds, 647. 1098 -1103. ISSN 0925-8388

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Abstract

In the present study, the variation of superparamagnetic (SPM) and ferromagnetic (FM) components and their effect on giant magnetoresistance (GMR) in electrodeposited CoCu/Cu multilayers (ML's) were investigated in the temperature range 30-300 K. For this, two different kinds of ML's, one with discontinuous Co-layer consisting of large superparamagnetic (SPM) (t(Co) = 0.2 and 0.3 nm) fractions and the other with continuous Co-layer containing large ferromagnetic (FM) (t(Co) = 2 and 3 nm) content were considered. Magnetoresistance measurements showed increase in MR magnitude with decrease in temperature associated with magnetic conversions in the magnetic Co-layers. At 300 K, a substantial difference in magnitude of MR was found for multilayers with t(Co) = 0.3 (5.07%) and 3 nm (8.82%). However, at 30 K very close values of MR for multilayer pair with t(Co) = 0.3 (16.48%) and 3 nm (17.72%) ensures a significant transformations of SPM to FM fractions in Co-layer at t(Co) = 0.3 nm. Similar results were obtained for the other pair of ML's i.e. t(Co) = 0.2 and 2 nm. This study suggests a suitable minimization of SPM content in the Co-layer could be another effective mechanism in maximizing the MR value. The measured temperature dependence of MR obeyed a simple T-1 law.

Item Type:	Article
Uncontrolled Keywords:	Co/Cu multilayers Giant magnetoresistance Pulse electrodeposition Superparamagnetism Low temperature
Subjects:	Chemistry > Physical Chemistry Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	28 Sep 2016 08:11
Last Modified:	28 Sep 2016 08:11
URI:	http://npl.csircentral.net/id/eprint/1883

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