12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > The effect of pH changes on the giant magnetore...
View graph of relations

« Back

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

Research output: Contribution to journalJournal article

Published

Journal publication date07/1997
JournalJournal of The Electrochemical Society
Journal number7
Volume144
Number of pages7
Pages2346-2352
Original languageEnglish

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.