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The effect of pH changes on the giant magnetoresistance of electrodeposited superlattices.

Alper, M. and Schwarzacher, W. and Lane, Stephen J. (1997) The effect of pH changes on the giant magnetoresistance of electrodeposited superlattices. Journal of the Electrochemical Society, 144 (7). pp. 2346-2352. ISSN 0013-4651

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Abstract

We have studied the effect of electrolyte pH on the "giant magnetoresistance" in Co-Ni-Cu/Cu superlattices prepared by electrodeposition. Films grown at low pH (1.8 ± 0.1) exhibited giant magnetoresistance (GMR) of over 15% while, depending on layer thicknesses, films grown at high pH (3.3 ± 0.1) exhibited either predominantly anisotropic magnetoresistance (AMR) or much smaller GMR than possible at low pH. Also, the films grown at low pH were found to have a higher magnetization than those grown at high pH. The different magnetic and magnetotransport properties observed for different values of the electrolyte pH are accompanied by changes in the shapes of the current transients recorded during film growth and by changes in the composition of the superlattices. A possible explanation of these results is that reducing the electrolyte pH leads to a more abrupt interface between the ferromagnetic and nonmagnetic layers by suppressing Co dissolution.

Item Type: Article
Journal or Publication Title: Journal of the Electrochemical Society
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21900
Deposited By: ep_ss_importer
Deposited On: 11 Feb 2009 11:33
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:53
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21900

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